abaqus常用技巧总结

Abaqus常技巧总结

建议阅读方式：

目录
ABAQUS常技巧总结 1
目录 2
1TIME INCREMENT根理解 4
2ABAQUS 请问 MOMENT加载 4
3ABAQUS计算时C盘时文件太改目录？ 5
4CAE中加预应力 5
5HYPERMESH里面ABAQUS分析结果 5
6XY PLOTS 5
7次分析结果作次分析初始条件该做 6
8材料方增量步 7
9INP文件实现批处理 7
10关ABAQUS务理 8
11关数输入输出 9
12处理积分 10
13接触分析激活杀死 10
14利QUEUE功机器远程UNIX机器提交ABAQUS作业方法 [精华] 10
15利命令进行计算时设置调存量 13
16清华学BBSABAQUS精华 13
17请问实现双曲线 36
18取消坐标系等显示 37
19计算中修改材料特性 37
20输出计算程中总质量总刚度矩阵 40
21先张预应力： 40
22户子程序 41
23样设定双CPU机器进行ABAQUS计算 41
24中途停止正运算JOB 42
25适应网格技术 42
26ABAQUS计算存 42
27质量缩放 43
28ABAQUS处理器进行行计算效果研究 54
29YAHOO讨组摘录CONTACT+OVERCLOSURE 55
30原创：限元建立方法希加分 70
31[分享]ABAQUS 问答 76
32[转帖]ABAQUS64导入外模型点验 87
33ABAQUS图层绘图 88
34子结构 89
35分析步改变材料参数 89
36模型重启动分析－RESTART 91
37 ABAQUS单位心 92


1time increment根理解
abaqusstep里maximum number of incrementinitial incrementminimum increment maximum increment四量许网友知样设置合理合理设置建立深刻理解基础
      理解问题首先需解abaqus计算程限元计算收敛性问题abaqus首先initial值输入进行叠代计算果计算结果收敛继续值代入计算步果收敛动减时间步长（time increment）重新计算直收敛然计算步
       果时间步长减值minimum时计算结果收敛abaqus停止计算知maximum值minimum值分abaqus收敛计算时时间步长限时total time求(time increment*number)时间步长时需计算步数number相应增(电脑计算花时间增)number般设置较值minimum越越1)number计算时间增2)abaqus计算精度约10^(5)时间步长值计算结果已没什意义
      限元计算收敛性（空间步长时间步长）值关minimum设10^(5)收敛适减空间步长（网格画细点）然办法果实计算许模型身点问题改显示explicit计算

MFc*bi6＼#s#fwwwsimwecom     总言maximun number适设置较值initial适改（23量级）minimum（5量级）修改maximum值影响改
2moment加载
请教位牛
算题目筒体三接端面固定筒体两端加载扭距知道加载请位高手赐教
谢谢
1 筒体两端施加扭矩节点分定义两Nsetleft right
2 分筒体两端圆心处定义两reference node rpleftrpright
3 命令两节点集绕3轴旋转度参考点耦合起度度否耦合根具体问题定
*KINEMATIC COUPLING REF NODErpleft
left 66
*KINEMATIC COUPLING REF NODErpright
right 66
4 两参考点施加绕3轴旋转弯矩

友情提醒reference node度注意相应边界条件
3abaqus计算时c盘时文件太改目录？
时目录Windows定义系统环境变量中修改

4CAE中加预应力
具体没作*PRESTRESS HOLD*INITIAL CONDITIONS TYPESOLUTION REBAR
两命令ABAQUS Analysis User＇s Manual
Defining reinforcement Section 223
Defining rebar as an element property Section 224
两节吧

5hypermesh里面abaqus分析结果
abaqus中计算完成结果文件输出*fil
2利hyperworks提供hmabaqusexe(安装目录Altair＼hw70＼translators中)
3控制台运行 hmabaqus *fil *res执行完成生成相应res文件
4hyperview中开模型文件*inp结果文件*res查结果
gook luck

6XY Plots
**
** STEP preload
**
*Step namepreload nlgeom
preloading
*Static
001 1 1e05 01

**
** LOADS
**
** Name ptload Type Concentrated force
*Cload
_G5 2 200E6
**

**
*Output history frequency1
*node output nset_G5
CF2U2
*element output elset_G5
E22 S22
**
*monitor node_G5 dof2

7次分析结果作次分析初始条件
Q果想次分析结果作次分析初始条件该做
ALDREAD命令
首先需注意面两问题
1ANSYS实体模型面体定义应单元类型编号材料属性
编号实常数编号单元坐标系编号参数整分析程中保持变
编号应属性步骤中
2网格划分满足步骤求单
元类型必须兼容
步骤
1创建实体模型
2 创建物理环境
设定物理环境中单元类型材料属性实常数坐标系等
参数编号赋实体模型面体
施加基物理载荷边界条件
设定求解选项

选择标题PHYSICS WRITE命令物理环境存入文件中
3清楚前物理环境命令PHYSICS CLEAR 4重复第二步准备物理环境

8材料方增量步
材料方：
针异性材料（板金材料复合材料等）变形体材料方定义材料某特定方纤维方该方着变形体移动移动旋转旋转输出场变量值材料方参考时便数处理分析计算结果等

abaqus中增量步
abaqus 中载荷定求分成干载荷步step步step根abaqus动载荷增量分成干增量increments增量施加定载荷然增量通干迭代步iteration 进行迭代系统达衡时迭代结束完成增量增量完成计算结束反计算出现发散时通采钟方法（调整放质量系数单元网格优化等）调整增量计算继续进行

9inp文件实现批处理
喜欢fortran
写成样：

nodedeformf90

FUNCTIONS
nodedeform Entry point of console application

Example of displaying ＇Hello World＇ at execution time


****************************************************************************

PROGRAM nodedeform

PURPOSE Entry point for ＇Hello World＇ sample console application

****************************************************************************

program nodedeform
USE DFLIB
implicit none
result SYSTEMQQ (＇abaqus job3d05ctJ interactive＇)
result SYSTEMQQ (＇abaqus job3d05ctJmodel2 interactive＇)
result SYSTEMQQ (＇abaqus jobtest1 interactive＇)
result SYSTEMQQ (＇abaqus jobtest2 interactive＇)
result SYSTEMQQ (＇abaqus jobtest3 interactive＇)
result SYSTEMQQ (＇abaqus jobtest4 interactive＇)
result SYSTEMQQ (＇abaqus jobtest5 interactive＇)
result SYSTEMQQ (＇abaqus jobtest6 interactive＇)
result SYSTEMQQ (＇abaqus jobtest7 interactive＇)
result SYSTEMQQ (＇abaqus jobtest8 interactive＇)
end program nodedeform

10关ABAQUS务理
关ABAQUS务理 [精华]
chibiko

发帖 26
积分 1
20040703 0356



前日子计算量机器快务算天开始算题时候CPU占基做捉摸天现终点掌握ABAQUS务理方法两点里家享系统WindowsXPABAQUS64
1ABAQUS64新增务理命令暂停恢复终止正背景运行务方法（命令行输入运行）：
务暂停：
abaqus suspend jobjobname

务恢复：
abaqus resume jobjobname

务终止：
abaqus terminate jobjobname

中务暂停（suspend）时候windows务理栏中会保留standardexplicit计算线程CPU资源务恢复（resume）时候继续工作
务终止CAE中提交务KILL功类似直接cut掉正运行务恢复实windows务理栏中强行终止差属合法操作

2利windos务理栏processes理功时仅仅强行关掉正运行务通改变优先级改变CPU占程度RealtimeHighAboveNormalNormalBelowNormalLow 五选等级windows默认等级Normal时务机抢占CPU资源般ABAQUS运行时想运行程序较困难特程序觉机器时明显延迟时ABAQUS务优先级设低腾出CPU资源级高务机器时候ABAQUS务级调样娱乐工作两误



You may try this method which was posted at simwe forum but not my original idea

Anyway I will feel very happy even if it probably just helps you just a little bit

11关数输入输出
1输出数dat文件：
*NODE PRINT NSETnset_nameFREQ1
COORD
变形前坐标变形变形坐标？？
偶前面已发文问偶时变形前时变形直没弄明白问题偶想变形坐标

2

实abaqus带相关功

abaqus jobjob1 suspend计算挂起果需重新进行运算
输入abaqus jobjob1 resume

3
输出量节点时间历程曲线？
环境文件abaqus_v6env中添加句
max_history_requests0

12处理积分
CAE带功速度时程积分位移时程样操作：
利XY Data>ODB History Output速度时程存V然XY Data>Operate on XY Data>Operations
integrate (X)


实现时间积分果dxdy积分
实现呢？
方说Qv*A
已知道流速矢量分布流量分布



关键xy data数两轴数什？积分y数值x值积分
：CAE user manual：3344Overview of X–Y data operations

13接触分析激活杀死
Usage Use both of the following options

*MODEL CHANGE TYPECONTACT PAIR ADD
surface_1 surface_2
*CONTACT INTERFERENCE
surface_1 surface_2



Usage *MODEL CHANGE TYPECONTACT PAIR REMOVE

14利queue功机器远程unix机器提交abaqus作业方法 [精华]

利queue功机器远程unix机器提交abaqus作业方法

假设：

1 远程unix机器安装目录abaqus

2 远程计算机IP址1921680166机名ibmlinux

3 计算机IP址192168018机名training

面讨涉容相应改变



Step 1 分设置计算机远程计算机间机名IP址应

1 修改hosts文件windows般位c＼windows＼system32＼drivers＼etcunix位etc加入远程计算机机名IP址应行：

1921680166 ibmlinux

2 修改远程hosts文件位etc加入计算机机名IP址应行：

192168018 training



Step 2 设置计算机远程计算机运行rshrcp命令正确

1 两台计算机登陆名密码致举例言远程计算机登陆名密码rootroot设置计算机样户名密码登陆

2 修改远程计算机rhosts文件该文件位应户名登陆目录homeroot加入计算机IP址计算机访问远程计算机

3 计算机提示符键入

rsh ibmlinux ls

测试rsh否够正常果列出远程计算机目录文件代表rshrcp工作正常



Step 3 设置远程计算机该户默认登陆程序csh修改passwd文件位etc：

rootTy91eFGzybEE203usrbincsh



Step 4 修改远程计算机abaqus环境文件abaqus_v6env

环境文件加入

queue_name [nice_queue]

after_prefix b

queue_prefix q

nice_queue binsh c ＇nice S 1>L 2>&1 &＇

保存

提示符面键入

abaqus fetch jobbeaminp

abaqus jobbeam queuenice_queue

果利获beamodb表示远程计算机queue设置正确



Step 5 修改计算机abaqus环境文件abaqus_v6env

环境文件加入

def onCaeStartup()

def makeQueues(*args)

import os driverUtils

driverName ＇abaqus＇

scratchDir ＇abaqusCommands＇

sessionQueue(name＇nice＇

queueName＇nice_queue＇

hostName＇ibmlinux＇

driverdriverName

localPlatform NT

fileCopyON

directoryscratchDir)

addImportCallback(＇job＇ makeQueues)

保存



Step 6 计算机启动abaquscae创建开模型Job模块创建新务选择Run ModeQueue选择niceOK提交运算观察否务动提交远程计算机abaqusCommands运行动返回odb文件计算机错误会启动cae提示符窗口中出现检查错误找相应解决办法

15利命令进行计算时设置调存量
abaqus jobjobname memorymemorysize

16清华学bbsabaqus精华


luxz (panda) 作中提
位什办法？
感觉abaqus前处理爽
patran？

感觉abaquscae错呀实体建模颇proe风格
感觉patran太麻烦
许patran功更强(然起硕身躯呀)
庞模型根体现出什优势


air1侠作广告？
请问：弹塑性矩阵D]ddsdde联系
板壳单元？

stressD*stran
d(stress)ddsdde*d(stran)



应该样全量理
SijDijklEkl（满足张量求约定）
StressD*Strain
增量理中
△SD*△E(限变形中△实应该应力客观率）



似吧
变形D非彼D
黄克智固体构关系书
果全量理增量理角度讲
似第Digkl

第式子
果求导久完？

应该样全量理
SijDijklEkl（满足张量求约定）
StressD*Strain
增量理中
△SD*△E(限变形中△实应该应力客观率）


啊变形[D]普通意义[D]构型样
毕竟[D]变形历史函数[D]
推导种新构关系
△SijDijkl△Ekl (中△Jaumann率）
假设材料开始屈服（屈服面0）
想壳单元


似吧
变形D非彼D
黄克智固体构关系书
果全量理增量理角度讲
似第Digkl
第式子
果求导久完？

啊变形[D]普通意义[D]构型样
毕竟[D]变形历史函数[D]
推导种新构关系
△SijDijkl△Ekl (中△Jaumann率）
假设材料开始屈服（屈服面0）
想壳单元

唉提问题出abaqus中明明写着考虑剪切效应
印出剪切力数nshr1S12
S13S23知计算
（DDSDDE(55)法计算ntens3计算DDSDDE(33))



编umat编进久行
NDINSHRNTENS表示变量表示变量
样意计算呀意实际计算变量数

唉提问题出abaqus中明明写着考虑剪切效应
印出剪切力数nshr1S12
S13S23知计算
（DDSDDE(55)法计算ntens3计算DDSDDE(33))

UMATabaqus传变量（选壳单元时）ntens3
ndi2nshr1样话STRESS3STRESS(3)计算
STRESS(4)STRESS(5)理STRAINDDSDDE存样情况
中厚度板壳元中(MINDLIN)中DDSDDE5×5


FOR文件收惜研究象相差太懂
文件中定义变量根没
方似毫处代码：SMISES段
觉应该太急第步应该保证代码正确性
外面讨觉应该换种单元试试
梁单元NDINSHR会样
知道定壳单元？
果必须壳单元S23S31必须UAMT
中输出具体做法清楚
DDSDDE理解 dSDDSDDE*dE


意思矩阵
般D矩阵6*6
编umat需适应单元
然6*6矩阵应该完全

算体时候
果壳单元ntens3
等三呗
反正D6*6矩阵放

果三维实体单元ntens6
D矩阵全啦

记住编umat应该适应单元考虑参数值
stress(3)许家D6*6第行第二行四行

sigh
知道说明白没

UMATabaqus传变量（选壳单元时）ntens3
ndi2nshr1样话STRESS3STRESS(3)计算
STRESS(4)STRESS(5)理STRAINDDSDDE存样情况
中厚度板壳元中(MINDLIN)中DDSDDE5×5


DDSDDE实应力应变斜率感觉
真正计算利更新应力DDSDDE觉确保收敛
真开心讨ABAQUS特umat
国外师兄说Umaterial国外应广


DDSDDE实应力应变斜率感觉
真正计算利更新应力DDSDDE觉确保收敛
真开心讨ABAQUS特umat
国外师兄说Umaterial国外应广


位侠提出uamtstatev感兴趣实
高兴希家摸索东西介绍家现程序通
（没屈服面概念)然结果错误总静心前
运行umat程序standardexe error(程序datmsg中
错误信息log说error see msgbut msg中）
现明白户程序中WRITE(**)写入logwrite(6*)写入
dat等
监控程序时发现statev()次迭代增量运行0
步值次0怀疑误
侠提醒



dat等
监控程序时发现statev()次迭代增量运行0
应该0果增量步重新更新
输入文件*inp中*depvar忘写statev()维数哦

步值次0怀疑误
侠提醒



单元？
saturn (工作) 作中提
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~前知道
应该0果增量步重新更新
输入文件*inp中*depvar忘写statev()维数哦



air1 (影风※勤奋羊羊※课题) 作中提
写命令
输出言
单元？

已写定义statev维数
*depvar
20


错误statev
输出显示第三增量步中statev0
清楚uamt程序执行程

板次壳元s4r面采缩减积分1×1厚度方5点simpson
积分道理
没增量步迭代步积分点会运行次umat
问题迭代该运行5次
面statev次迭代会改变（次运行）？
请air1beauty_lifesaturn等位相助


书例子
果定义statev（nblock*）数组
应该积分点进行迭代计算更新变量值
（写stateNew(nblock*)
请问Mikejwg变量statev输出？
象应力应变样进行绘图动画等处理？


意思log文件中输出没odb中输出
想element output等样输出UVARM中定义
statev老兄试试


发信 Mikejwg (mikejwg) 信区 FEA
标 题 abaqus中UMAT侠
发信站 BBS 水木清华站 (Tue Dec 25 153627 2001)

位侠
加入弹塑性构模型时加入区分弹性部分塑性部分（
非弹性部分）说输出时EELEIE([PE])umat中
发现dstranstress没发现关应力应变变量


说区分弹性部分塑性部分指应变弹塑性部分：EEE+PE？
指加载程弹塑性？


EEE+PE


觉想umat输入参数里面区分
先算出弹性然stran减弹性塑性
猜哦


明白知程序明白
定条件解出位移增量abaqus应变增量dstranstran
弹性部分dEEijdSij(2G)dEPijdstranijdEEij
控制程序？
默认情况样计算
谢谢


清楚构
概觉果屈服面话
statev（）记录步EEEP
然通应力偏量计算DEEDEP然更新EEEPstran扯关系
前见Umat算J2流动理时候做


首先构采屈服面概念（种新型弹塑性构模型）
采j2流动法例子umat中statev重定义
eepestatevEEPEIE样odb中输出
说umat中eepeinp中eepe
谢谢


试试uvarm
呵呵


发信 Mikejwg (mikejwg) 信区 FEA
标 题 Re ABAQUS中弹塑性应变计算问题？？
发信站 BBS 水木清华站 (Thu Dec 27 141927 2001)

uvar()勉强成功


标 题 abaqus中DSTRANSTRAN工程剪应变？

Sat Dec 29 094403 2001)

题涉ddsddepeeq计算



发现


peeq计算？



umat中计算peeq(umat系统缺省peeq0)然uvarm输出


uvarm输出里？odb？
外strav？？定义umat数组里数输出odb里？
谢成长中侠

umat中statevoutput中statev作解
状态变量说惭愧umat中定义peeq(peeq）求解般
弹塑性力学书（等效塑性应变）write()写入时文件
（（切记：文件unit号abaqus中重合系统默认
文件号））
然uvarm中读取uvarm输出uvarmodb形式输出
支持outputfieldoutputhistory
知谁更方法
听说清华abaqus熟
家奖没办法出文总学午版qq中指点番


YOU CAN TRY AS FOLLOWS
*STEPEXTRAPOLATIONNOINC2000000
*STATIC
0001500000000101



step里选项选择


手写程序
新建step
然定义边条
step定义边条节点重新定义边条
选项new
样取消step边条设置


载荷步里重新定义边界条件加参数new

第二载荷步里：
*STEP




*BOUNDARY CONDITIONSOPNEW


*END STEP


Command方式：abaqus jobjob_name usersource_file（者obj_file)
CAE方式：submit时候选择source_file（者obj_file)

太明白意思
果需应力应变等数行请求
输出行啊觉abaqus处理功基够直接输出*odb文件


中CAE者Viewer处理
*el print输出dat文件包含信息版号处理容等
想直接输出处理软件话输出result file文件*fil
二进制文件者ASCII文件需处理者直接Hypermesh等处理
程序开做图


tool>display>create－>选定单元集者节点集
然操作取代等等（里面两圆圈相交
想减）试试



处理行吧
非计算形成*odb

前处理里面啊



Pythonabaqus中运行scrpit文件CAE manual中
附录中例子存*py文件然CAE菜单中
run script运行

BTW请问abaqus版？62 or 63？63盗版？



(1)请问MCK矩阵什命令

试试：*element matrix output

(2)想Newmark方法求解求解问题ABAQUS中实现者
里找类似例子

：standard manualsanalysisdynamics analysisexplicit manuals

(3)ABAQUS中实现样东西需滑ABAQUS产生位移场
滑环境中完成

试试输出选项：
*El printPositionaverage at Nodes

abaqusCAE生成节点集定义某实体处理实体节点


CAE例题样做
NODE SETabaqus基功方便处
CAE中支持
例子做没问题

toolsetcreate居然选择CAE生成节点（顶点）

没正确操作Partition Edge步

sunhaolan 作中提
abaqusCAE生成节点集定义某实体处理实体节点



ABAQUS divides all of its analysis procedures into
two main groups linear perturbation and general
ABAQUS makes a very clear distinction between
perturbation and general analysis procedures because
loading conditions and time are defined differently
for the two cases Furthermore the results from each
type of procedure should be interpreted differently
The response of the model during a general analysis
procedure known as a general step may be either
nonlinear or linear In a step that uses a perturbation
procedure which is called a perturbation step
the response can only be linear ABAQUS treats
such steps as a linear perturbation about the preloaded
predeformed state (known as the base state) created by
any previous general steps therefore its capability
for doing linear simulations is rather more general
than that of a purely linear
analysis program

位侠定义step时候前三standard中相关命令
step 4时候想explicit求解定义amplitude模拟
位移时间简单变化命令：
*step name～～～nlgeominc1000(explicit里没inc参数）
*dynamicexplicit
2
*amplitude nameramp
001121
*boundary amplituderamp
refpunch(刚体参点）22003
*end step

问题？
外standard命令explicit命令出现inp文件中？


转换

ABAQUSStandard and ABAQUSExplicit are separate program modules with
different data structures hence the
explicit dynamics procedure cannot be used in the same analysis as any of
the procedures in ABAQUSStandard
However ABAQUS provides a capability to import a deformed mesh and associated


material state from
ABAQUSExplicit into ABAQUSStandard and vice versa This procedure is
described in ``Transferring results between
ABAQUSExplicit and ABAQUSStandard＇＇ Section 762 of the ABAQUSStandard


User＇s Manual

linyuwho (苍龙悔) 作中提
位侠定义step时候前三standard中相关命令
step 4时候想explicit求解定义amplitude模拟
位移时间简单变化命令：
*step name～～～nlgeominc1000(explicit里没inc参数）
*dynamicexplicit
2
*amplitude nameramp
001121
*boundary amplituderamp
refpunch(刚体参点）22003
*end step



feature菜单删项基准点种feature

工具栏铅笔样东东


想计算出应力应变位移等数提取出软件里处理
请问该办？dat里没找数阿？res文格式
没啊


计算结果没文格式数倒出
显示结果模块中名字忘
sketch前面
report菜单中处需文件
文件格式：rpt



谢谢什应力应变呢？计算出位移数会没呢？
santong (supernova) 作中提
计算结果没文格式数倒出
显示结果模块中名字忘
sketch前面
report菜单中处需文件
文件格式：rpt

发信 wjytj (赖子) 信区 FEA

STEP模块field outputhistory output改变默认
请求输出位移U
者*step中加：
*NODE PRINT
U

计算完成*DAT文件中提取节点位移


请问field outputhistory output什区？
关键字*node output*node print什区？谢谢
inp数文件里行：

*Output field frequency99999
*Node Output
U RF
*Element Output
S E EE

*Output history variablePRESELECT
*El Print freq999999
*Node Print freq999999

中history output中*node print关键字没指定输入U
导出数没U选项请问什原？

wjytj (赖子) 作中提
STEP模块field outputhistory output改变默认
请求输出位移U
者*step中加：
*NODE PRINT
U
计算完成*DAT文件中提取节点位移

发信 Mikejwg (mikejwg) 信区 FEA

field outputhistory outputviewer模块中明显
field output场量输出history output历史数输出会记录场量时间曲线



*node output*node print区写入缀文件
*odb*dat等help中详细介绍
wsun 作中提
请问field outputhistory output什区？
关键字*node output*node print什区？谢谢
inp数文件里行：
*Output field frequency99999
*Node Output
U RF
*Element Output
S E EE
*Output history variablePRESELECT
*El Print freq999999


发信 wjytj (赖子) 信区 FEA

然补充句：
*node outputCARVIEWER做处理二进制文件
*node print写DAT文件中文文件

Mikejwg 作中提
field outputhistory outputviewer模块中明显
field output场量输出history output历史数输出会记录场量时间曲

*node output*node print区写入缀文件
*odb*dat等help中详细介绍
wsun 作中提
请问field outputhistory output什区？
关键字*node output*node print什区？谢谢
inp数文件里行：
*Output field frequency99999
*Node Output


发信 octopuszy (猴哥) 信区 FEA

*node outputodb文件中输出br > *node printdat文件中输出

Mikejwg (mikejwg) 作中提
field outputhistory outputviewer模块中明显
field output场量输出history output历史数输出会记录场量时间曲
*node output*node print区写入缀文件
*odb*dat等help中详细介绍



file>print>file
文件类型选择：pngtiff
Dshmy 作中提
谢谢



般说样理解：
Δσ＝ddsdde*Δε
点常说弹塑性矩阵：Dep

wjytj 作中提
*USER MATERIAL定义中ΔσΔε偏倒数
DDSDDE称：
material stiffness matrix
UMAT中DDSDDE称：
material＇s Jacobian matrix
请问DDSDDE材料切线刚度矩阵关系什？
二者概念？

第二

octopuszy (猴哥) 作中提
偶umat中调求应力函数
CALL SPRINC(STRESSPSLSTRNDINSHR)
存储应力数组PS中
应力排列序什？
PS1>PS2>PS3
PS1 PS1>PS3>PS2
谢谢


abaqus jobjobname parametercheck
abaqus jobjobname datacheck
abaqus jobjobname continue

gentlewtj (gentlewtj) 作中提
没检查错误方法？



uptonow (目前止) 作中提
1边界条件加载时总initial步然定义
加载步请问initial步作什？掉？
掉分析默认步
2A solid extrusion base feature 句话什意思？
extrusionrevolution等什意思？
两三维建模时候画完二维图形生成三维图形
extrusion意思定厚度然二维图形第三方面伸展形成三维图形


revolution意思定旋转轴二维图形绕旋转形成三维轴称图形
谢谢

发信 fangxj (fxj) 信区 FEA
标 题 Re abaqus中接触问题请教
发信站 BBS 水木清华站 (Fri Jun 14 155120 2002)

接触问题收敛两方面妨试试：
*CONTACT PAIR 里调试ADJUST参数
二调模型参数FRICTION等
octopuszy (猴哥) 作中提
偶模型中存两物体接触计算程中报错：
***WARNING OVERCLOSURE OF CONTACT SURFACES FOUNDATIONOUTSIDE and
BUCKETOUTSIDE IS TOO SEVERE CUTBACK WILL RESULT YOU MAY WANT
TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION

***WARNING CONVERGENCE JUDGED UNLIKELY INCREMENT WILL BE ATTEMPTED AGAIN


WITH A TIME INCREMENT OF 976563E05
***ERROR TOO MANY ATTEMPTS MADE FOR THIS INCREMENT ANALYSIS TERMINATED
知该解决？

standard隐式作动力分析explicit显式作动力分析该explicit

uptonow (目前止) 作中提
请问两书什
做圆形杯子深模拟程里standard书
位explicit书虾请留言想复印谢谢：）


般说样正确果行
datlogmsg中找中断增量步假60妨
res_pulse中
*restartreadstep1inc59

ypm (红塔山) 作中提
abaqus程序(结构动力学standard模块假设名
pulseinpstep inc1000 restart命令参数
*restart write frequency10)算半停掉然
想中止方继续运算
定义res_pulseinp中命令
*restartread
然command窗口输入 abaqus jobres_pulse oldjobpulse
结果程序起始点开始运算中断方请问什
原 刚学久希侠指点指点thanks

发信 Mikejwg (mikejwg) 信区 FEA

uptonow直水木清华写点东西直忙毕业文说困难


出现永远解完问题体会写点东西：
umat中
(总结三点：
1求试算应力stressstress+De*dstran (中：De弹性矩阵）
2应力势函数(屈服函数）求解满足条件应力应变
注意试算应力真实应力关系：sigma_trueSigma_triDe*dpstran dpstr


an塑性应变增量满足屈服条件F（Sigmaij）＝0求真实应力
更新应力 stressstressDe*dpstran
3（2联合弹塑性区域转换）判断否屈服
4组集ddsdde(构关）
4步UMAT实现

采迭代步构造ddsdde然dsigmaddsdde*dstran取验收敛慢

敏感步长

希家交流

发信 uptonow (什受伤总) 信区 FEA

衷心感谢Mikejwg侠该出手时出手 希Mikejwg侠常出手
造福UMAT万民　
Mikejwg (mikejwg) 作中提
uptonow直水木清华写点东西直忙毕业文说困难

出现永远解完问题体会写点东西：
umat中
(总结三点：
1求试算应力stressstress+De*dstran (中：De弹性矩阵）
2应力势函数(屈服函数）求解满足条件应力应变
注意试算应力真实应力关系：sigma_trueSigma_triDe*dpstran d
an塑性应变增量满足屈服条件F（Sigmaij）＝0求真实应力
更新应力 stressstressDe*dpstran
3（2联合弹塑性区域转换）判断否屈服
4组集ddsdde(构关）


发信 wjytj (赖子) 信区 FEA

精华区帖子帮助家感兴趣
Mikejwg 作中提
uptonow直水木清华写点东西直忙毕业文说困难
出现永远解完问题体会写点东西：
umat中
(总结三点：
1求试算应力stressstress+De*dstran (中：De弹性矩阵）
2应力势函数(屈服函数）求解满足条件应力应变
注意试算应力真实应力关系：sigma_trueSigma_triDe*dpstran d
an塑性应变增量满足屈服条件F（Sigmaij）＝0求真实应力
更新应力 stressstressDe*dpstran
3（2联合弹塑性区域转换）判断否屈服


发信 uptonow (什受伤总) 信区 FEA

精华区帖子太少需补充呢推辞：）
推辞逃避责呵呵开玩笑
wjytj (赖子) 作中提
精华区帖子帮助家感兴趣

发信 edodo (漠孤沙) 信区 FEA

老哥挺身出呀哈哈
期中
uptonow (什受伤总) 作中提
精华区帖子太少需补充呢推辞：）
推辞逃避责呵呵开玩笑

发信 air1 (影风※勤奋36时※永言败) 信区 FEA

犯错误
1发现456方应变工程应变
2全量法直接根更新应变求应力单独求ddsdde矩阵
3ddsdde时更新收敛性影响

Mikejwg (mikejwg) 作中提
uptonow直水木清华写点东西直忙毕业文说困难

出现永远解完问题体会写点东西：
umat中
(总结三点：
1求试算应力stressstress+De*dstran (中：De弹性矩阵）
2应力势函数(屈服函数）求解满足条件应力应变
注意试算应力真实应力关系：sigma_trueSigma_triDe*dpstran d
an塑性应变增量满足屈服条件F（Sigmaij）＝0求真实应力
更新应力 stressstressDe*dpstran
3（2联合弹塑性区域转换）判断否屈服
4组集ddsdde(构关）


发信 wjytj (赖子) 信区 FEA

1发现456方应变工程应变
说白UMAT中应变列量形式存储初始刚度DDSDDE形式：
λ＋μ μ μ 0 0 0
μ λ＋μ μ 0 0 0
μ μ λ＋μ 0 0 0
0 0 0 μ 0 0
0 0 0 0 μ 0
0 0 0 0 0 μ
应变工程应变果DDSDDE形式（直接张量表示）：
λ＋μ μ μ 0 0 0
μ λ＋μ μ 0 0 0
μ μ λ＋μ 0 0 0
0 0 0 2μ 0 0
0 0 0 0 2μ 0
0 0 0 0 0 2μ
应变应该应变张量中应变说采工程应变方便应


已求弹性应变直接应力列量转置应变列量显然编


程中容易实现

2全量法直接根更新应变求应力单独求ddsdde矩阵
感应该减少少工作量

3ddsdde时更新收敛性影响
希air1够说更详细开始采初始刚度采切线刚度


控制编程实现呢？


air1 作中提
犯错误
1发现456方应变工程应变
2全量法直接根更新应变求应力单独求ddsdde矩阵
3ddsdde时更新收敛性影响
Mikejwg (mikejwg) 作中提
uptonow直水木清华写点东西直忙毕业文说困难
出现永远解完问题体会写点东西：
umat中
(总结三点：
1求试算应力stressstress+De*dstran (中：De弹性矩阵）


发信 wjytj (赖子) 信区 FEA

2全量法直接根更新应变求应力单独求ddsdde矩阵
构中DDSDDE确定需知道STRESS中某量
请问意思验UMAT中否先STRESS(
利全量法）然DDSDDE？
果话应该减少迭代求解次数
谢谢


假定采mises屈服准
1 调UMAT前ABAQUS传递UMAT次增量开始时应力sigma(0)总应变E应变增


量delta(E)
状态变量保存：弹性应变塑性应变等效塑性应变
（请问状态变量保存弹性应变＋塑性应变否等ABAQUS传递UMAT总应变？？？


？？）
2然UMAT中利述ABAQUS传递量状态变量DDSDDE矩阵然返回


ABAQUSABAQUS根delta(sigma)ddsdde*delta(E)次增量结束时应力


sigma(1)sigma(0)+delta(sigma)sigma(0)+ddsdde*delta(E)
3 然更新次增量结束时状态变量：弹性应变塑性应变等效塑性应变供次调


UMAT
请问手册UMAT必须更新应力根述理解ABAQUS根UMAT提供


次增量DDSDDEABAQUS中更新请问底回事？谢谢


觉Abaqus中更新应力必须必须准确构核心DDSDDE


准确保持DDSDDE直初始刚度矩阵然样做问题


会收敛速度较慢者根收敛

Manual中说DDSDDE影响结果前提结果

家讨
uptonow 作中提
假定采mises屈服准
1 调UMAT前ABAQUS传递UMAT次增量开始时应力sigma(0)总应变E应
量delta(E)
状态变量保存：弹性应变塑性应变等效塑性应变
（请问状态变量保存弹性应变＋塑性应变否等ABAQUS传递UMAT总应变


？？）
2然UMAT中利述ABAQUS传递量状态变量DDSDDE矩阵然返回


ABAQUSABAQUS根delta(sigma)ddsdde*delta(E)次增量结束时应

sigma(1)sigma(0)+delta(sigma)sigma(0)+ddsdde*delta(E)
3 然更新次增量结束时状态变量：弹性应变塑性应变等效塑性应变供




期盼久abaqus63终安装成功
寄希成功importigs模型（unigraphics v18生成）
结果意现感受说：
1 63import进模型形状基真实形状差62更原始模型
然invalid geometry
2 delete invalid geometry确实成imprecise geometry(意味着
划分网格）时形状已面目全非删太东西
imprecise geometry 毫意义
3 果automated repairinvalid geometry
现急需文件import进进行步工作
老板出国前定务11月底出结果
现连模型问题
急急急
请侠帮忙
救救吧建议吧


PATRAN导入生成网格ABAQUS计算

试试parasolid文件格式iges格式先天足尤表达曲面

知道abaqus支持parasolid文件？般情况igs格式

点


State variables
Since the redefinition of field variables in USDFLD is local to the current


increment (field variables are restored to the values
interpolated from the nodal values at the start of each increment)
any history dependence required to update material properties by
using this subroutine must be introduced with userdefined state variables


The state variables can be updated in USDFLD and then passed into other user


subroutines that can be called at this material point
such as those listed above The number of such state variables is
specified with the *DEPVAR option

引入材料非线性需usdfld引入历史相关statev帮忙
(理解全面参考manual中段版g吧忘文摘区


行


感谢
现弄明白原文件里行空行没想abaqusinp文件允许空行



感谢wjytj帮助刚开始abaqus太弱
wjytj 作中提
*NGEN
111111
1112111
**时122223……110节点未生成生成1222节点没意义
样行否？
*NODE
1010
111010
11100
121100



solutiondependent variable
字面理解解答关变量值增量结束时变量关常



UMAT中SDV*DEPDV定义数

timedependent variable
字面理解时间关变量常定义时间变化量震荷载等



*APPLITUDE定义
octopuszy 作中提
solutiondependent variable
timedependent variable
两种变量什差？
谢谢

octopuszy 作中提
UFIELDUSDFLD定义场量什
外solutiondependent variable
timedependent variable
什？
谢谢

标 题 家点关UMAT建议

天UMAT调试通非常高兴
验说家点建议：
1UMAT般应该适合种应力状态NDI＝23
应该适
2UMAT中应力应变列量存储方式（标）：
112233121323112233122331
3ABAQUS第次计算中传递UMAT应变STRAN应变增量
DSTRAN值均零（需DDSDDE）时UMAT中
应力应该零UMAT中分母零种情况
应该注意（样陷里面天）

17请问实现双曲线
subroutine fric(lmtauddtddgddtddpdslipsedspd
1 ddtddtpnewdtstatevdgamtaulmpressdpressddpddh
2 slipkstepkinctimedtimenoelcinameslname
3 msnamenptnodenpatchcoordsrcoorddrottemp
4 predefnfdirmcrdnprednstatvchrlngthpropsnprops)
c
include ＇aba_paraminc＇
c
character*80 cinameslnamemsname
dimension tau(nfdir)ddtddg(nfdirnfdir)ddtddp(nfdir)
1 dslip(nfdir)ddtddt(nfdir2)statev(*)
2 dgam(nfdir)taulm(nfdir)slip(nfdir)time(2)
3 coords(mcrd)rcoord(mcrd)drot(22)temp(2)
4 predef(2*)props(nprops)
c
parameter(zero00D0two20D0)
c
if (lm eq 2) return
c
aprops(1)
bprops(2)

c
lm0

tau(1)dslip(1)(a+b*dslip(1))
tau(2)dslip(2)(a+b*dslip(2))
ddtddg(11)tau(1)slip(1)
ddtddg(22)tau(2)slip(2)
ddtddg(12)zero
ddtddg(21)zero
dslip(1)dgam(1)
dslip(2)dgam(2)
return
end

18取消坐标系等显示
CAE进行处理画等值线图挺错果通Print to File图形质量差远远屏幕截图效果通屏幕截图问题坐标系——特关ODB中前stepincrement等需信息起截请问关闭信息？

Module VisualizationCanvasViewport Annotation Options

19计算中修改材料特性
If you like to use USDFLD in the subroutine you can get step number and just use a if to
determine the field variable value due to the step number Say step 1 is 1 and step 2 field
variable become 2 In the material definition just define material properties as a function of
your field variables Here I use elastic as example I＇m not sure about the grammar since I do
not have manual at hand You need to check them something like this
*elastic dependencies
2e5031
1e5032

Here I assume your material does not have any temperature dependency and you need to make
sure field variable is the 4th value Then in step 1 you have 2e5 as Young＇s modulus and in step
you have 1e5



yogayoga问题修改材料特性计算收敛请您帮
inp文件中讲面语句定义材料特性：
*elastic dependencies＝1
15e7031
2e10022

然采usdfld子程序现子程序附面请您帮检查检查提出宝贵意见谢谢

SUBROUTINE USDFLD(FIELDSTATEVPNEWDTDIRECTTCELENT
1 TIMEDTIMECMNAMEORNAMENFIELDNSTATVNOELNPTLAYER
2 KSPTKSTEPKINCNDINSHRCOORDJMACJMATYPMATLAYOLACCFLA)
C
INCLUDE ＇ABA_PARAMINC＇
C
CHARACTER*80 CMNAMEORNAME
CHARACTER*3 FLGRAY(15)
DIMENSION FIELD(NFIELD)STATEV(NSTATV)DIRECT(33)
1 T(33)TIME(2)
DIMENSION ARRAY(15)JARRAY(15)JMAC(*)JMATYP(*)COORD(*)
c
c
FIELD(1)time(2)
c print*field(1)
c
c
RETURN
END


First if you want a sudden change you can not use total time Abaqus will linearly interpolate
all the value If that＇s what you want OK If you want a sudden change at step two use kstep
instead
Second consider the real physical situation you got equilibrium before you changed material
properties After you changed material properties you naturally lose it Stress need to be
redistributed and changed to get force balance This is the reason for non convergence

You have several way to deal with it if you have static problem and rate effect is minimal you
can keep the bc and let the model balance itself The other way is to decrease the increment
length You can also try damping (you can just apply stabilize directly) or adding some viscoplastic
or plastic effect Dynamic analysis will also help to do the trick Basicly the method normally you
deal with unstable problem


改变材料参数甚模型通办法：
（1）分析间传递结果
细节请见：ABAQUS Analysis User＇s Manual 771 Transferring results between ABAQUS
analysis products overview
该方法缺点建立模型时partsassembly
某情况非常方便想第步变形基础做续分析
（2）场变量然定义材料时指明参数赖该变量
果场变量（定物理意义）明确目前讨问题定义变量
step1时候1step22(便定义)：
*STEPnamestep1
*STATIC
*FIELD VARIABLE1
NALL 1
*END STEP
*STEPnamestep2
*STATIC
*FIELD VARIABLE1
NALL 2
*END STEP

NALL包含节点集合根需改变成欲改变参数节点集
然定义材料时指明某参数赖该场变量：
*MATERIAL
*ELASTIC DEPENDENCIES1
200E9 03 1
180E9 03 2
样计算step1时节点场变量110abaqus查表确定模量200E9step2
场变量变2模量180E9

果场变量连续变化赖计算结果温度应变等USDFLD子程序（25238
USDFLD
User subroutine to redefine field variables at a material point
）连续改变该变量定义材料时样需指定参数该变量变化表ABAQUS计算
时动插值计算材料参数

情况需该子程序



If you like to use USDFLD in the subroutine you can get step number and just use a if
to determine the field variable value due to the step number Say step 1 is 1 and step
2 field variable become 2 In the material definition just define material properties
as a function of your field variables Here I use elastic as example I＇m not sure about
the grammar since I do not have manual at hand You need to check them something like
this
*elastic dependencies
2e5031
1e5032

Here I assume your material does not have any temperature dependency and you need to make
sure field variable is the 4th value Then in step 1 you have 2e5 as Young＇s modulus
and in step you have 1e5

20输出计算程中总质量总刚度矩阵
element matrix outputelsetfile nameuser definedMASSYESOUTPUT FILEUSER DEFINED

21先张预应力：
先张预应力：
INITIAL CONDITIONS TYPESTRESS REBAR

22户子程序
假设输入文件
ainp
bfor
ABAQUS command 中命令应该样：
abaqus joba userb

abaqus64pr11command 中输入：
abq64pr11 joba userb


然首先 cd 命令进入 输入文件 前文件目录

强烈建议command操作

子程序文件名缀应 for f


23样设定双CPU机器进行ABAQUS计算
try ABAQUS jyourjob CPUS2


什操作系统系统试2000xp
述系统abaqus仅支持domain行计算CMD
abaqus job paralleldomains domains2 cpus2
直接CPUS2行说641没试
果直接abaqus job
时务理器应该2cpu50跑：explicite没试stantard会
果xp单击进程名explicite然右键找选项分配cpu
指定进程跑时两跑指定优先级
果时算两道题选进城低标准样干事
果网载默认行
2 X xp 1800+机器

24中途停止正运算JOB
If you run Abaqus with interactive mode you can use Ctrl+C to kill it
If you run in backgroud you can use
abaqus suspend jobjobname to suspend your job
abaqus resume jobjobname to resume your suspended job
abaqus terminate jobjobname to terminate your job

25适应网格技术
模板：
*HEADING

*ELEMENT TYPE ELSETACOUSTIC
Data lines to define acoustic elements
*ELEMENT TYPE ELSETSOLID
Data lines to define structural elements
*SURFACE NAMETIE_ACOUSTIC
Data lines to define the acoustic surface interface with the structural mesh
*SURFACE NAMETIE_SOLID
Data lines to define the solid surface interface with the acoustic mesh
*TIE NAMECOUPLING
TIE_ACOUSTIC TIE_SOLID

*STEP
*STATIC
*ADAPTIVE MESH ELSETACOUSTIC MESH SWEEP10

*END STEP
**
*STEP
*STEADY STATE DYNAMICS DIRECT

*END STEP

26abaqus计算存
求解器会估算存量ABAQUS计算时估算物理存加硬盘享存果
需超出二者停止计算果次物理存装先放硬盘存区然逐步读入物理存啥物理存扩解算精度提高原时隐式超3G显式超2G 增量步超1000000步样（硬软件决定限）显示隐式CPU存求算问题类型算题隐式计算CPU作没存说CPU数量快慢没存改变计算时间影响显式CPU数速度计算时间影响
8Q＇BmM6SLx9P*F仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentabaqus存调整
U)I7U^}KuQH仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM果存较里调整
9|^WgA |Simwecom|仿真|设计|限元|虚拟仪器1edit job 话框中点击memory 然里面存值设现存稍memory policy 选moderate 者maximum  
x0co8q(G1U|Simwecom|仿真|设计|限元|虚拟仪器2虚拟存调者直接固定虚拟存 abaqus_v6env文件里面修改（ABAQUS＼651＼site）
27质量缩放
ABAQUS Analysis User’s Manual 1171

概
准静态分析某动态分析中少数尺寸较单元控制稳态时间增量提高计算效率ABAQUSExplicit常采质量缩放方法质量缩放：
§ 缩放整模型单单元单元组质量
§ 步分析中缩放分析步中质量
§ 分析步起始整程中进行质量缩放
质量例缩放通方式执行：
§ 采定常数子特定单元进行质量缩放
§ 指定单元采相例子进行质量缩放单元组意单元稳态时间增量等户定时间增量
§ 仅单元组稳态时间增量户定时间增量单元进行质量缩放单元稳态时间增量等户定时间增量
§ 缩放指定单元质量单元稳态时间增量等户定时间增量
§ 金属成形分析基网格形状初始条件动进行质量缩放

简介
显示动态程常解决两类问题：瞬时动态响应计算含复杂非线性效应（常见复杂接触条件）准静态模拟求解动态方程时采显示中心差分法衡方程中离散质量矩阵计算效率精度起关键性影响果恰运质量缩放方法保证计算精度情况提高计算效率然适合准静态模拟质量缩放技术动态分析中必须采质量缩放方法存差异

准静态分析
应变率关材料准静态分析然时间重节省计算时间效办法两种：减少分析时间步长增加模型质量（质量缩放）率关材料两种方法产生效果相果模型中含率相关材料首选质量缩放方法该方法保留然时间
准静态分析质量缩放方法通常整模型执行然模型部分刚度质量时常选中模型某部分进行质量缩放部分分进行缩放情况没必减模型质量实际值意增加质量通常会影响计算精度数准静态问题定程度质量缩放增加ABAQUSExplicit时间增量减计算时间然必须保证质量改变增加惯性力计算结果没显著影响
诚然修改材料密度达质量缩放效果节描述方法灵活性更特步分析中
关准静态程中质量缩放讨参Rolling of thick plates Section 136 of the ABAQUS Example Problems Manual

动态分析
动态分析中然时间度量非常重获瞬态响应必须精确表示模型实际质量惯性然许复杂动态模型包含尺寸极单元显示动态分析采时间增量尺寸单元通常生成复杂网格时形成通分析步起始时控制单元质量进行缩放显著增加稳态时间增量整模型动态行影响忽略计
真正动态问题少数单元进行质量缩放允许明显增加整模型质量否会降低动态结果精度
关动态分析中采质量缩放讨参Impact of a copper rod Section 1310 of the
ABAQUS Benchmarks Manual

稳态时间增量
节中单元稳态时间增量指单单元稳态时间增量单元－单元稳态时间增量指某单元组单元稳态时间增量值稳态时间增量指整模型稳态时间增量

模型中引入质量缩放
显示动态分析中两种质量缩放方法：定例质量缩放变例质量缩放两种方法分开结合起质量缩放整模型单元组

定例质量缩放
定例缩放方法组装成全局节点质量阵单元质量进行缩放该方法分析步起始时执行缩放质量阵接着该分析步增量步非时采变例缩放果接分析步中没重新定义质量缩放定例缩放方法延续
定例缩放两种基方法：直接定义质量缩放子者户定义稳态时间增量显示动态分析程确定质量缩放子
定例缩放方法简单分析步起始时修改准静态模型质量修改动态模型少数单元质量控制稳态时间增量分析步起始时执行次质量缩放该方法计算效率高
Input File Usage           
*FIXED MASS SCALING
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step

变例质量缩放
分析步中变例缩放方法期性缩放单元质量采类型质量缩放方法时需定义稳态时间增量：质量缩放例子动计算求施加单元
分析步中控制稳态时间增量刚度变化剧烈时变例缩放非常准静态体积成形分析单元压缩量动态分析中常会出现样情形
Input File Usage           
*VARIABLE MASS SCALING
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below


Create Semiautomatic mass scaling Scale Throughout step

直接定义质量缩放子
动必须保持准静态分析中直接定义质量缩放子户指定单元组单元定义固定质量缩放子单元质量分析步开始时缩放整分析步中保持变非通变例质量子进步修改质量
Input File Usage           
*FIXED MASS SCALING FACTORscale_factor

例单元组单元质量放10倍
*FIXED MASS SCALING FACTOR10 ELSETelset
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step Scale by factor scale_factor

定义理想单元－单元稳态时间增量
定例变例质量缩放方法户单元组定义单元－单元稳定时间增量ABAQUSExplicit确定必质量缩放子定义单元－单元稳态时间增量时三种互斥质量缩放方法供选择面种方法进行详细阐述
确定增量步稳态时间增量ABAQUSExplicit首先单元－单元基础确定稳态时间增量然根模型高频率全局估计算法确定稳态时间增量选两种估计值中较者作稳态时间增量般说全局估计器确定稳态时间增量单元－单元估计器确定值采定例变例质量缩放方法单元组指定单元－单元稳态时间增量时直接影响单元－单元稳态时间增量估计值果模型中单元采单质量缩放定义单元－单元估计值等单元－单元稳态时间增量定值非采罚方法强加接触约束罚接触会导致单元－单元估计值单元－单元稳态时间增量值定值略全局估计器实际稳态时间增量值单元－单元稳态时间增量定值果仅模型部分执行质量缩放没质量缩放单元单元稳态时间增量单元－单元稳态时间增量定值单元控制单元－单元稳态时间增量估计值结果仅部分模型进行质量缩放时时间增量通常等单元－单元稳态时间增量
果显示动态分析步定例时间增量尺度初始单元－单元稳态极限基础者直接指定663节描述规计算时间增量

均匀缩放质量
求模型动保持准静态分析均匀缩放质量种方法直接指定例子相似两种情况单元质量统根单例子进行缩放然均匀质量缩放方法质量缩放子ABAQUSExplicit确定户指定单元施加均匀相质量缩放子单元中稳态时间增量等单元－单元时间增量定值dt
Input File Usage           
Use either of the following options
*FIXED MASS SCALING TYPEUNIFORM DTdt
*VARIABLE MASS SCALING TYPEUNIFORM DTdt

ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step or Throughout step Scale to target time increment of dt Scale element mass Uniformly to satisfy target

仅单元稳态时间增量低定值单元进行质量缩放
仅缩放单元稳态时间增量低定值单元适准静态分析动态分析增加关键单元稳态时间增量非常
分析步开始时网格包含控制稳态时间增量单元时采定例方式缩放单元质量理想时间增量开始分析增加控制单元质量意味着显著提高稳态时间增量整模型影响忽略计
累积变形产生定数量单元分析程采变例方式单元进行质量缩放限制稳态时间增量降
Input File Usage           
Use either of the following options
*FIXED MASS SCALING TYPEBELOW MIN DTdt
*VARIABLE MASS SCALING TYPEBELOW MIN DTdt

ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step or Throughout step Scale to target time increment of dt Scale element mass If below minimum target

通质量缩放单元具相等单元稳态时间增量
单元进行质量缩放致具相稳态时间增量效影响模型特征频谱会引起质量属性剧烈变化种方法适准静态分析意味着某单元例缩放子会
1
Input File Usage           
Use either of the following options
*FIXED MASS SCALING TYPESET EQUAL DT DTdt
*VARIABLE MASS SCALING TYPESET EQUAL DT DTdt

ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step or Throughout step Scale to target time increment of dt Scale element mass Nonuniformly to equal target

全局质量缩放局部质量缩放
单元组指定定例变例质量缩放模型局部区域进行质量缩放指定单元组重复定义质量缩放方法时局部定义覆盖全局定义
Input File Usage           
Use either of the following options
*FIXED MASS SCALING ELSETelset
*VARIABLE MASS SCALING ELSETelset

ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step or Throughout step Region Set elset

分析步开始时进行质量缩放
定例质量缩放仅分析步开始时指定质量缩放例通常缩放原始单元质量直接定义缩放子时定缩放子进行质量缩放果指定单元－单元稳态时间增量dt基该值进行质量缩放果缩放子单元－单元稳态时间增量指定首先质量缩放子进行缩放单元－单元稳态时间增量选定例缩放类型决定否进行缩放
局部质量缩放针特定单元组定义果没指定单元组模型中单元采定例质量缩放单元组允许定例质量缩放定例缩放包含单元组重叠部分指定单元组定义局部质量缩放会覆盖全局质量缩放
Input File Usage           
*FIXED MASS SCALING FACTORfactor DTdt TYPEtype ELSETelset
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step


Scale by factor factor Scale to target time increment of dt

例：
某准静态分析程模型单元定义质量缩放子500假定定义该缩放子少数极形状极差单元影响稳态时间增量理想值进步加稳态时间增量选项：
*FIXED MASS SCALING FACTOR50 TYPEBELOW MIN DT5E6
指定缩放子模型中单元质量放50倍果质量放50倍单元稳定时间增量05*10E6单元质量进步放单元稳态时间增量等05*10E6

分析步中进行质量缩放
指定单元－单元稳态时间增量变例质量缩放方法分析步起始整分析步时必须指定频率间隔数定义质量缩放执行频繁程度进行质量缩放增量步中时间增量般单元－单元稳态时间增量定值
特定单元组定义局部质量缩放组单元定义次果没定义单元组针单元进行变例缩放变例质量缩放涵盖单元组重叠局部质量缩放覆盖全局质量缩放
Input File Usage           
*VARIABLE MASS SCALING DTdt TYPEtype ELSETelset
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale Throughout step Scale to target time increment of dt

等增量步间隔进行质量缩放
户指定两次质量缩放间增量步数例指定频率5表示执行质量缩放时刻分分析步开始第5第10第15增量步值注意选择频率会会增加计算时间
Input File Usage           
*VARIABLE MASS SCALING TYPEtype DTdt FREQUENCYn
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale Throughout step Scale to target time increment of dt Scale Every n increments


等时间间隔进行质量缩放
外指定执行质量缩放时间间隔例历时10秒分析步指定时间间隔5表示执行质量缩放时刻分分析步开始02秒04秒……10秒
Input File Usage           
*VARIABLE MASS SCALING TYPEtype DTdt NUMBER INTERVALn
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale Throughout step Scale to target time increment of dt Scale At n equal intervals

分析步开始程中采质量缩放
情况理想做法分析步初采种质量缩放方法分析程中进行修改
Input File Usage           
采两选项：
*FIXED MASS SCALING FACTORfactor TYPEtype DTdt_init
*VARIABLE MASS SCALING TYPEtype DTdt_min FREQUENCYn
or NUMBER INTERVALn
ABAQUSCAE Usage
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale At beginning of step Semiautomatic mass scaling Scale Throughout step

举例
动态击分析中网格中存少数尺寸极形状极差单元单元控制稳态时间增量分析步初单元进行质量缩放外击导致部分区域网格发生严重扭曲稳态时间增量受击区单元控制
实质击区单元相刚性表面稳态选择性质量缩放方法保证整动态响应受影响指定时间增量单元进行质量缩放效减少计算时间
例采定例质量缩放指定模型中单元稳态时间增量限值10E6外采变例质量缩放指定击区单元(elset1)稳态时间限值05E6样分析步开始时检查单元果单元稳态时间增量10E6分单元进行质量缩放达10E6单元组elset1外单元分析程中保持该质量缩放分析步中变例缩放影响单元组
elset1稳态时间增量05E6分析程中单元组elset1进行质量缩放会出现整模型稳态时间增量05E6情况

分析步中质量缩放
分析步转分析步质量缩放保留删已缩放单元质量重新初始化跨分析步应质量缩放方法应遵循规：
§ 果新分析步中没重新定义变例质量缩放方法前步定义变例质量缩放动保留
§ 果新分析步中没重新定义定例质量缩放方法前步分析结束时单元质量否缩放保留
步分析中第步外分析步开始时质量缩放单元质量变化较会影响质量计算精度单元质量变化较时建议新分析步开始时先定例缩放方法单元质量重新初始化（回原始值）然定义必质量缩放方法

删质量缩放
前分析步中定义变例缩放方法删前步中变例缩放保留前步中变例缩放前分析步中应重新进行定义
Input File Usage           
*VARIABLE MASS SCALING
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Semiautomatic mass scaling Scale Throughout step

举例
假定准静态分析第步单元历变形导致稳态时间增量急剧降外假定第二步变形稳态时间没明显影响
*VARIABLE MASS SCALING TYPEBELOW MIN DT1E5 FREQUENCY10
*VARIABLE MASS SCALING
第步定义10增量步模型中单元进行次质量缩放单元－单元稳态时间增量1 × 10–5第二步没进步采质量缩放第步缩放单元质量
重新初始化
第分析步外分析步默认采定例缩放重新初始化单元质量回原始值样定例质量缩放防止缩放质量新分析步种方法适准静态分析步（需进行质量缩放）转动态分析步（需进行质量缩放）
缩放新分析步中质量时指定合适例子者指定合适单元－单元稳态时间增量缩放类型仅部分单元进行质量缩放时需定义单元组
Input File Usage           
Use the following option to reinitialize the mass of the entire model to its original value for a new step
*FIXED MASS SCALING

ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Reinitialize mass

举例
假定某分析程次包括准静态分析动态分析两步准静态分析步中执行质量缩放动态分析步中关闭该功
*FIXED MASS SCALING TYPEBELOW MIN DT1E5
*FIXED MASS SCALING
第分析步中定义分析步开始时整模型单元－单元稳态时间增量10 × 10–5第二步中采定例缩放方法质量矩阵重新初始化

质量缩放适场合
质量缩放会影响列项目：
§ 热－力耦合中热响应结果
§ 重力载荷粘滞压力载荷
§ 绝热分析
§ 材料状态方程
§ 流体单元流体连接器单元
§ 弹簧阻尼器单元
项目相关密度保持变质量元旋转惯量元限体刚性单元进行质量缩放然没单元没稳态时间增量通两种方式进行质量缩放种户指定例缩放子种施加非均匀单元－单元稳态时间增量果采者少单元稳态时间增量壳梁旋转惯性元基质量缩放
限元进行质量缩放变形体相邻单元密度必须进行相例缩放否边界安定

金属辊轧成形分析中动质量缩放
金属辊轧成形通常准静态程常采ABAQUSExplicit进行模拟求解程省时常增加产品质量然必须优选质量缩放子质量变化应惯性力变化明显改变计算结果例子选择高会产生非准静态解选择低例子会导致运行时间长辊轧变例质量缩放选项动优先该程例子
动策略基础半动方法缩放单元质量具相等稳态时间增量该方法辊轧程参数动计算合适稳态时间增量目标值该目标值参数确定：辊轧方单元均长度送料速率V产品截面节点数n送料速率辊轧程中稳态情况均速度分析程中调整目标值实际送料速率相匹配户必须指定均速度估计值辊轧方单元均长度截面节点数
单元质量原始质量点等单元稳态时间增量质量缩放方法该强制条件意味着惯性效果显著辊轧问题作准静态问题分析时动调整单元质量
获计算结果建议：
采二维截面拉伸方法进行网格划分
辊轧方单元长度变化
初始送料速率接稳态送料速率
横截面单元尺寸等辊轧方单元尺寸
辊轧动变例质量缩放外没质量缩放方法

Input File Usage           
*VARIABLE MASS SCALING ELSETelset1 FREQUENCYn
TYPEROLLING FEED RATEV EXTRUDED LENGTH
CROSS SECTION NODESn
ABAQUSCAE Usage 
Step module Create Step General Dynamic Explicit or Dynamic Tempdisp Explicit Mass scaling Use scaling definitions below Create Automatic mass scaling Feed rate V Extruded element length Nodes in cross section n






28ABAQUS处理器进行行计算效果研究
环境：
ABAQUS63+8 IntelXeon 700MHz CPU+4G Ram+Win2k AdvServer SP3

命令行模式abaqus命令面三参数进行行计算控制：
[cpusnumberofcpus]
[parallel{loop | domain | supernode | tree}]
[domainsnumberofdomains]

ABAQUSExplicit
parallel参数选domainloop
domain进行拓扑域行loop进行循环级行（默认）
NT系统支持loop参数
cpus数整domains数cpu进行domain计算

Getting Started with ABAQUSExplicit
65 Example circuit board drop test
circuitinp分析例(standard_memory 256 Mb)

1cpu
abaqus jobcircuit int
cup利率100运行时间506s
2cpu
abaqus jobcircuit paralleldomain domains4 cpus2 int
cup利率接100运行时间402s
4cpu
abaqus jobcircuit paralleldomain domains4 cpus4 int
cup利率80左右运行时间297s
8cpu
abaqus jobcircuit paralleldomain domains8 cpus8 int
cup利率40左右运行时间364s

ABAQUSStandard
parallel参数选supernodetree
supernode(默认)单波前进行行处理tree波前时进行行处理
domains参数效
线性方程稀疏刚度矩阵模型行计算效

ABAQUS Release Notes
27 Parallel sparse solver
t1stdinp分析例(standard_memory 1000 Mb)

1cpu
abaqus jt1std int
cup利率70左右运行时间390s
4cpu (supernode)
abaqus jt1std parallelsupernode cpus4 int
系统cpu均cpu利率运行程中断幅变化运行时间454s
4cpu (tree)
abaqus jt1std paralleltree cpus4 int
系统cpu均cpu利率运行程中断幅变化运行时间352s
8cpu (supernode)
abaqus jt1std parallelsupernode cpus8 int
cpu利率接100运行40分钟法结束
8cpu (tree)
abaqus jt1std paralleltree cpus8 int
cpu利率接90运行时间545s

结：
CPU行处理Explicit效果显著Standard情况效果明显甚
运算更慢Standard学基考虑买cpu机器

29yahoo讨组摘录contact+overclosure

8776 Urgent help overclosure of contact problems
I have a contact problem which the mesh of the master Surface and the slave surface are of the same size Acturally the Master nodes and the slave nodes are sharing the same coordinates They have the same location but different node numbers But when i run the abaqus The warning message of the Overclosure of the master surface and slave surface is too much Severe
In abaqus manual one way to slove it is to use Adjust00 in the contact pair to establish contact at the Initial configuration
Or to use contact interference How to manange contact when master surface and slave Surface are the same location but will seperate or penetrate when Loading
Re
Liang I had solved a similar problem by increasing the mesh density of the Slave surface by about 2 times and increasing the distance between master and Slave surface so that there is a small gap between them I am not sure if you Can do that in your problem but this is an option

These are the warnings you are seeing What are the error messages when it aborts as seen from the message file What exactly asre you simulating Usually your slave surface (more deformable) Must be more finely meshed than the master surface

5996 Exponential contact pressureoverclosure relationship & separation
I am dealing with an interface where I have defined a softened interface following an exponential relationship It appears that this configuration does not allow the separation of the two surfaces Would you know how to disable this behavior I have found in the doc how to not allow separation but I have here the oposite case I need the separation
Re
You can just toggle off the box for allow for separation )
Yes just erase NO SEPARATION on the *CONTACT PAIR card Softened contact DO allow separation the particularity is that you will have a contact pressure even if the surfaces are opened

5176frction and contact
I have a coaxial cylindrical shell structure in which a polymeric cylinder has been placed between two steel cylinders and then pressure is applied on the external surface of the structure I am looking for the collapse pressure of the structure when debonding between polymeric layer and steel layers is allowed So far I have a model which works with low and moderate friction coefficient (01 to 06)
However to make sure that my model is behaving well I decided to run a fully bonded model (layers sharing node with each other) and then compare the result with a debonded model with high friction coefficient (eg 0910) I expect that the buckling pressure should be close
Now the problem is as friction coefficient is going up (>07) analysis fails without a single increment progress with messages regarding overclosure and contact opening etc Looking at the ABAQUS manual it seems that there are two different methods to solve the problem One is using NO SEPARATION contact behaviour and the other one is to use UNSYMMNO Both of them are working in my case when applied but I do not know which one is the correct one or the most appropriate one


My questions are 1 Is my understanding of the high friction and the way to avoid convergence problem is right 2 How can I decide what should I choose (NO SEPARATION or UNSYMMNO) Any help would be greatly appreciated

4473 how to model the two plate contact together
I model the two steel plates connected the sides of them are modeled by connector element and the contact surface I use contact command But ABAUQUS give me the warning below
***WARNING THE SYSTEM MATRIX HAS 239 NEGATIVE EIGENVALUES
***WARNING OVERCLOSURE OF CONTACT SURFACES ANGLEPLANE and GUSSETPLANE IS TOO SEVERE CUTBACK WILL RESULT YOU MAY WANT TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION SLAVE NODE 3513 OF CONTACT PAIR (ANGLEPLANEGUSSETPLANE) HAS JUST CLOSED A NEW CONTACT PATCH NEEDS TO BE DEFINED FOR THE SLAVE NODE
And I use this commond *Surface Behavior no separation pressureoverclosureHARD and connenctor element is 3D Connector element beam to located at the edge nodes of two plates I only want to model the two contact surface deform with each other without frictionThey can＇t penetrate into each other＇s inside Would you give me some suggestion Thanks in advance
Re
I am not all that experienced with Abaqus but I think what the error means is that there are 239 negative volumes elemenst in ur model It might be due to meshing very close surfaces together that your elements between the plates have turned inside out Ur model has to be free of all the negative elements before you can do any analysis on it If u are modeling two simple plates u can try meshing them on another meshing program and then make sure that there is no negative elements in the mesh before u import it in Abaqus to do any analysis Guys feel free to correct me if I have mistaken
May be ur initial penetration is too much (modeling) or ur initial time step is too high ABAQUS is trying to resolve overclosure there Either adjust model so that it will be just contact or just before contact distance or reduce ur initial time step so that u can avoid overclosure thingy But it may be because of normal issue If it it plate contact I think it will be working fine with few adjustment
By the way how are u dealing with edge line contact
I get the same messages when running a contact problem Is it realted to

ABAQUS CAE did anyone tried to use the Contact Pair option in ABAQUS Explicit
If it worked some other way please advice thanks

**4400contact
I am currently doing some analyses including contacts for a composite shell To have a better understanding about contact I started by modelling a composite beam consisting of three layers (SteelPolymerSteel) The steel plates were master surface and polymeric layer was slave I was expecting that when I am pressing the steel plates the polymeric layer should slide and squeeze out (the Poisson抯 effect)
I was using solid elements (brick element) On the contact surfaces the slave and mater nodes had the same coordinate but different node numbers When I was using reduced integration point formulation for 1st or 2nd order elements the solution did not converge and I had warning messages regarding numerical singularity and overclosure suggesting to change HCRIT etc Even when I refined the mesh for slave surface (twice as master surface) the problem did not disappear until mesh refinement in slave surface was in a way that the nodes in slave and master were not 揷oincide Furthermore I had to use full integration elements rather than reduced integration elements even in 2nd order elements to allow the analysis converges which is strange to me First of all my question is why this is a case (mesh refinement in slave surface and avoiding reduced integration point formulation for the 2nd order elements) Having succeeded in analysis of composite beam (although I have problem to understand why this is a case) I modelled a long shell (LD10) with three layers (SteelPolymerSteel) allowing the same sort of contact describing above I ended up with memory shortage (I have modified the prememory and standard memory as high as I could) A simple solution to memory is to add RAM but I am hopefully trying to solve the problem in other ways Now my second question is how one can 搊ptimiseThe size of the model when you are dealing with contact Any help will be greatly appreciated
Re
It＇s very hard to define optimal contact definition in general It depends on many variablesbut usually 1 Define contact where only contact is occuring Usually I run without contact (disp loading) to see where it penetrates then grow contact from that region 2 If it really is not serious contact (large sliding etc) try to

use simplified version (small sliding etc)
So I think the less contact I have it＇s better situation I am not sure about fullintegration reduced integration shellI thought ABAQUS is using kinematic relation type contact (penalty in explicit) surface is generated based on nodessurface (master) then keep calculating relative distance between masterslave (nodes) etcnot sure where integration point thing comes in
More node (refined) will generate smoother surfacedepends on what contact u are using (finite sliding small sliding etc) the number of nodes to check distance will increase
Solution will converge if u use small step displacement type loading until it reaches problem points apply very small initial increment and check in what instance ABAQUS is having trouble(assuming no serious overclosure)

4337 modeling an arch dam
I＇m trying to model an arch dam by CAE scripting As far as i＇ve understood the solid modeling is based on extrusion operation for 3D solids But this may not be applicable for generation of the arch dam blocks Any idea on this
Re
This may be create in others cadcamcae & then should be convert to *inp for abaqus
Thanks for your reply But I think ABAQUS should consider adding some more features for creating base solid models in next versions Feature based modeling is quite a strong tool and I beleive adding further capabilities to it CAE can be used as a very strong mesh generator
Do U have Abaqus 633
Yes truly all depends on terms Up to an output of the new version it is possible to make probably only so with required quality


4141 Possible contact problem
Hi group I am running an impact simulation using ABAQUSEXPLICIT between an analytical rigid body and a deformable element based solid At the start of the step the rigid body is in contact (no overclosure) with the node based surface of the element based solid A force is then applied to the reference node of the rigid body I am interested in the displacement of the surface nodes on the deformable body but they are consistently too low in comparison to the

experimental results I have
I have read of lots of people having contact problems and was wondering if it is possible that I am having a contact related problem I have checked the total contact force between the surfaces and it seems to be about right Is it possible that the contact is not working properly if I am getting the right contact force between the surfaces
Re
You haven＇t said anything about the nature of your deformable body Is the real object undergoing plastic deformation or creep that you are not modeling
In rereading your original question I see that you are doing impact Creep is probably not an issue and I＇m not sure about plasticity or viscoelasticity How great is the discrepancy between FEA and experiment
Hi Danny thanks for your reply Impact occurs over a short time (~1ms) so as you say creep viscoelasticity shouldn＇t be a factor I expect a displacement of 28mm based on experiment and FEA yields a value of 15mm There are other possible sources of error in the simulation that I am investigating but I wanted to eliminate the possibility that the contact wasn＇t working properly

*4004 simulate micro indentation
I am using ABAQUS 62Standard to simulate micro indentation procedure (ABAQUSExplicit is not available) At first I wanna to do a very simple simulation A sphere indenter is put into aluminum block material I set the indenter as rigid and constrain it fully Then the Step is static and distributed load on the bottom surface of the block Contace pair is the top surface of the block (slave) and the rigid sphere surface (master) Unfortunately I always got the warning information overclosure of contact surfaces is too severe What has gone wrong What shall I do to get rid of it and reach the right solution
Re
(1) check if the surfaces do not touch each other
(2) use a small increment for the calculation start
(3) check if your rigid surface definition is ok sometimes the surface normal points to the wrong direction see manuals for right definition
> the program computes the distance of the slave nodes from the master surface and takes into account this surface normal so you will

get always a overclosure for separated surfaces if you choose the wrong direction
I have noticed that you are modelling microindentation in ABAQUS I wonder if you know of any references that can help me to get started with a microindentation model I have no idea on how to do it since all the literature that I have found says that classical plasticity does not apply but that I should use strain gradient plasticity theory which is not available in ABAQUS Any help will be greatly appreciated
Strain gradient plasticity is just a new kind of theory to consider the size effect of material It means the material properties in small size scale (nano or micro) is different from large scale The theory is called to be a bridge between continuum mechanics and dislocation theory It is mainly proposed by Gao Huajian and Nix in Stanford univeristy and Huang in UIUC They have done indentation simulation based on the theory (check their papers) The constitutive equation should be changed in the simulation I believe it is a quite complicated job I am using classical plasticity theory because currently my scale is much larger (Dozens of microns)

**3666 CONTACT PROBLEMS
I am facing problem defining the Contact I must define whats the Geometry Its 2D problem Axis Symmetric 2 Rigids body are holding Material Sheet In the CONTACT Region of Rigid bodies and material The material is not allowed to flow when the Deformation takes place The rest of material part is facing Fluid Pressure I hope you understand its Forming Process
The problem is overclosure The Nodes of material body with in Rigid bodies get the problem and Convergence is not reached so it aborts Some body please guide me what options i should use to overcome this problem
Re
Are you applying load or displacement to your rigid bodies
*Does your problem start out with an overclosure If it is your intention to have the rigid bodies contact the deformable solid with an initial linetoline contact you may want to use the ADJUST parameter on the *CONTACT PAIR command
I am not applying ne force on rigids bodies they are just holding the material the nodes of material that are under rigid bodies are fixed
*Good ABAQUS has trouble resolving contact with load applied to rigid bodies applying a displacement to the rigid bodies rather than load is much

easier for ABAQUS to resolve As Danny suggested ADJUST might help Also it will make your message file large but you can try using *PRINT CONTACTYES to give you a better idea of what is going on at the contact interface (this will tell you which nodes are overclosing and by how much)
This is puzzling Do you mean that
a) The rigid bodies are controlled by displacements (zero or nonzero) and
b) The nodes on the surface of the deformable body which are in contact with the rigid body are fixed
Then nothing will move and no deformation will occur
This geometry is almost the same as an example in ABAQUS Example Problems Manual Volume 1 the Example is CYLINDRICAL CUP DEEP DRAWING
Now I want a little change in this
1 Instead of Punch I want to use the FLUID PRESSURE
2 Material held between the HOLDER and DIE should not be moved when the deformation takes place meaning only part of material under FLUID PRESSURE is deformed I hope this will clear what i want to do I will be greatly looking for the suggestion

3535 composite structure and contact
I would like to model 搒lidingBehaviour of middle layer of a threelayer composite structure For simplicity imaging there is a solid rectangular beam (C3D8RH) consisting of three layers The middle layer (core) is much softer than the exposing (face) layers Then structure is going under external pressure from one of the face layers In reality the nodes of core have the same coordinate than faces (ie Sharing the same nodes) But when you want to study the sliding behaviour of core you need to have I suppose different series of node sets (for face and core respectively) but with same coordinates and then allow the contact between them My problem is I will get the following warning message in the msg file which it is understandable
***WARNING OVERCLOSURE OF CONTACT SURFACES 揂NNIBr> and 揊LINEIS TOO SEVERE CUTBACK WILL RESULT YOU
MAY WANT TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION
Now if I want to change the HCRIT it will not be a case and in the case of 搒ame coordinates I do not know how much it should be Have anybody crossed such problems Any help would be

greatly appreciated
Re
***I have faced similar problems earlier and the following worked for me
Use ADJUST parameter to specify the depth of adjustment zone This might allow you to avoid changing the HCRIT valueIn most contact problems overclosure due to smaller than required HCRIT occurs right at the beginning of the simulation which means that the slave nodes are penetrating the master surface in the initial configuration itself ADJUST parameter will reposition the nodes and enable modeling of the sliding behvior with good accuracy
Thank you very much for your email Actually I have tried it and still could not perform the analysis successfully I also had problem with memory shortage which means that I should make my model smaller If it does not make any problem could you please forward me the contact part of input file you have written for your own model to my email address

3517 Contact SimulationSevere Cut Back Problem
I am having problem in my simulation my message file is giving this warning
***WARNING OVERCLOSURE OF CONTACT SURFACES SA000005 and SP000009 IS TOO SEVERE CUTBACK WILL RESULT YOU MAY WANT TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION
I have reduced the value of HCRIT till 00001 m But still having the same message Is it due to the high load And how can I get rid of this message as it sometimes stop after a no Of iteration step due to this problem Waiting
Re
Check your surface normals If they are in the wrong direction ABAQUS thinks your surfaces have already penetrated each other
Thanks Rich for the reply
My *dat file shows that the normals have been assumed by ABAQUS The message is
***WARNING NODE 4 ON SURFACE SP000009 HAS FACETS WITH NORMAL VECTORS DIFFERING BY MORE THAN 30 DEGREES CONVERGENCE DIFFICULTIES MAY OCCUR AT THIS NODE WITH FINITESLIDING CONTACT THE NORMAL CONTACT DIRECTION AT THIS NODE WILL BE (00000070622070799)
Any remedial action to avoid this
I think this topic of Contact Penetration has been discussed in the previous mails Try a word search with contact


*3504 Values for softened contact
I am considering using the pressureoverclosurelinear option on the *SURFACE BEHAVIOUR card I am interested in using this in conjuntion with the NO SEPARATION parameter and hopefully to have tension between the contacting bodies also (I don＇t think hard contact with no separation does this)
My problem is what values to pick for the pressureoverclosure relationship There is no particular data I need to use so is there numbers which people tend to use in general to get the advantages of softened contact (I am having problems with hourglassing) and to have tension available
Re
I believe that NO SEPARATION parameter can＇t be used in conjuntion with the modified surface behavior such as pressureoverclosurelinear at least in ABAQUSstandard My understanding to this is that once contact was established the slave nodes will be constrained fully to the master surface

***3200 Contact overclosure
I have a model with 3Dsolid elements (quad Tetrahedral) and a static step in abaqusstandard I defined a contact between two round surfaces initially separated During the second step the surfaces get in contact with each other I allways have an overclosure of the surfaces and the increments are getting smaller and smaller untill the analysis stops I changed masterslave and tried every value of hcrit but it didn＇t work It＇s allways the same What could I do else
Re
Perhaps you should use C3D10M instead of C3D10 C3D10M are designed for contact problems
Are you using ABAQUSStandard And is it a high enough speed impact If so like I had to Explicit may be a better option Just my thoughts
Thanks for your answer but I use C3D10M elements
*Yes I am using abaqusstandart Can I do in explicit a static analysis
Not really I think it is only for dynamic analysis Sorry I thought from your previous mail you were running a dynamic analysis Didn＇t read properly
A couple of suggestions Try adding command *CONTACT CONTROLS AUTOMATIC TOLERANCES in your steps This helps to reduce ＇chattering＇ at the contact face (see the manual for detail

Alternatively change your element type to 4 nodes (especially on the slave surface side) maybe C3D4
*The element choice plays a crucial part in contact element Many of the problems like overclosure Hourglassing atc can be reduced to a great extent by the right choice of elements I would suggest you try to change the element type and run it once and the try observing at what point of the second time step is the overclosure starting Keep checking for these in between the solution Also if the geometry is not too complex try the brick elements
**Try to impose a small displacement instead of a load in order to initialized the contact
First step small displacement
Second step you replace the displacement by the load
Becarfull do not forget your real boundaries
Second method use the parameter APPROACH in *Contact Controls command
Do you have SMALL SLIDING or finite sliding How do you move your second body Just a force load If this is true try a step with a small prescribed motion to close the contact then run a second step remove the boundary and add your force This will run Use *CONTACT CONTROLS ANALYSISDISCONTINUOUS

1378 Explicit and Contact
I＇m trying to do a simulation of a axisymmetric bolt thread being formed I followed an example in the examples manual as a guide but I＇m still having problems with the contact
1) The die is made of a rigid surface
2) The bolt material starts out as a rectangular slab
3) The rigid surface is the master surface
4) Friction is used (mu02)
5) Material of bolt is steel
6) The bolt mat＇l is fixed along the line of symmetry
7) The die moves towards the bolt at a velocity of 1600 mms
The problem I encounter is that the forming result is totally bizarre
First I get an initial warning that my overclosure is 133 (mm) And the ABAQUS will compensate for it in the first step I think my problem is here What I end up with is that the material moves to contact the die without the die moving in the first increment At least that is what is looks like to me I checked it in ABAQUSPOST and it does look like the elements first form around the die (which doesn＇t move in that increment) and then the when the die does move it doesn＇t deform

anything Any ideas or suggestions
Re
What I end up with is that the material moves to contact the die without the die moving
Abaqus post and viewer rescale the graphis to keep things centered on each increment I＇m guessing this is causing the illusion of motion
Have you checked if the outward normal at the contact surface is in the right sense Perhaps it is the reason of having an initial overclosure
Yep that was the problem The model works just fine now Thanks for all help Since i＇ve never used rigid analytical surfaces I didn＇t realize this was an issue It is

*1294 contact overclosure
We have a problem involving too many contacts Is there any other option other than ADJUST (*CONTACT PAIR keyword) parameter to curb penetration overclosure We understand this ADJUST is to take care of geometry modelling meshing errors While we donot give this the solution terminates at the beginning itself Giving ADJUST 00 makes the solution progress But we have been told not to use this parameter Is there any other way in place Thanks in advance
Re
Between what type of bodies are you modeling contact The problem depends to some extent on this If you are modeling contact between deformable bodies you might want to try the WEIGHT parameter Also try adjusting the mesh size of the elements belonging to master and slave surfaces
You might try *CONTACT INTERFERENCESHRINK

**593 Couple of Questions
I＇m wondering nobody couldn＇t give me guide(s) about my questions Could you please reply me if you can Soheil (below is my previous message) Dear Group I＇m a phd student at HeriotWatt University UK
I want to model the bending of pipe on rigid circular surface I faced with problem in contact of pipe which has been modelled by S4 element and the rigid surface which modelled by R3D4 elemnt I would like to know
1 What is the best way for modelling of a 3D circular rigid surface (eg An exterior surface of a quarter of cylinder)
2What is the command name in ABAQUS for merging of nodes In other softwares like LUSAS or NISA the merge command is used I

guess it is MPC in ABAQUS isn＇t it
3Which parameters should be taken into account when you want to choose a magnitude for increment ie INC
4 I faced the following WARNING message in msg file What should I do to overcome it What does it mean VALUE OF HCRIT
***WARNING OVERCLOSURE OF CONTACT SURFACES SHELSUR and RGDSUR IS TOO SEVERE CUTBACK WILL RESULT YOU MAY WANT TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION
(SHELSURF is positive side of pipe and RGDSUR is rigid surface)
5Finally about print of odb files what is the procedure I couldn＇t find any rough described path in ABAQUSViewer manual I want to know what should I type in Print Command box when you open print window I seek help of everybody and I do appreciate your help in advance
Re
1Best way of modeling rigid surface is building up the surface with analytical surface Analytical one is always better than numerically discretized one in view of analysis costs and accuracy It＇s like mises is better than tresca in terms of easiness of numerical implementation
2It＇s MPC TIED It does not merge the nodes as you want it simply eliminates dof of specified nodes in stiffness matrix and makes this node inactive during current analysis
3Im not sure what is the keypoint of this question If you want to use user defined time increment use DIRECT keyword in *STATIC
4 This message generally arise when there is large amount of penetration during current sdi HCRIT means If there developed contact penetration larger than this value there＇ll be cutback rather than more iteration

305 Problems of Overclosure
I am trying to model a machining process where the workpiece is clamped onto the machining platform Different sections of the workpiece are machined at different stages and this requires new set of clamps to be introduced into the model for each stage The clamps are idealised by using contact analysis This is because I do not want some sections of the workpiece to be rigidly constrained
The problem is that I have severe overclosure in the model for some contact pairs when I activate new contact pairs in the restart analysis to introduce the new set of clamps for machining the next section of the workpiece


I am not very familiar with contact analysis but I have read that we can use commands such as *contact interference shrink or *contact pairadjust to solve such problems (I was not aware of these command initially) However as these comands are defined at the first step of the analysis would the overclosure problems be rectified for the reactivated contact pairs that were previously inactive in the restart analyses I would very much appreciate any other suggestions to solving the problem too
Re
The clamps are idealised by using contact analysis This is because I do not want some sections of the workpiece to be rigidly constrained I＇d say dont use contact pairs at all You are adding a complicated nonlinearity where all you want is a stiffbutnotrigid boundary condition Imagine your clamp is jsut a stiff spring and use *EQUATION
If you must model the clamping start with the clamp slightly away from the part and push it into contact as a step Soft contact helps quite alot with convergance as well

*5994 assembly parts instance options in ABAQUS
I hope everybody is doing fine I am using the assembly parts instance options in ABAQUSExplicit to build my model I am facing problems at the common interface of two parts of a model Does anybody knowhow abaqus joins the two parts or how they define the commmon nodes for two parts When I am checking my data file I found that globally abaqus is definig two nodes at the same location And if it is doing that then how the nodes are coneected between parts Do I need to define the connection at the common interface or assembly option is supposed to do it automatically
If any body has any idea or any experience with the assembly parts instance options in ABAQUS please reply ASAP
Re
Abaqus will not join the two instances together You will need to define some interaction between the two instances using interaction module If u want to merge two parts then you can merge using assembly module itself If u want to merge the nodes of the two instances then you can do the following if your part is a geometrical representation then mesh it and create input file for that Open it using abaqus which will open it with only nodes and elements (orphan mesh)then you can opt for merging the two orphan mesh part instances in assembly module (but make sure to you dont merge the nodes)then that creates third part with the

nodes at the interface unmerged Then in part module you can click the node on the interface you want to merge and then merge it
Thanks a lot for your reply But actually i am not using ABAQUSCAE We don＇t have the license for that So I am building my model trough text editior I am definig the parts first and meshing them Each part contains tie constraints is some regions The tie constarints are defined with in each part Then I am definig the assembly by positioning the parts using *parts instance option When the whole assembly is built I am defing the boundary conditions and contact regions I have contact between steel and concrete at one face And i am definig that (in the step data) afetr definig the assembly
My model is running and there is no error message in any file But the only thing is that each part is behaving individually
As u have have mentioned about the merging option how can I do that by text editor
The solution is to define a *CONTACTTIED card between the two parts But the stresses in this region won＇t be accurate

584 Couple of Questions about CONTACT
I＇m a phd student at HeriotWatt University UK
I want to model the bending of pipe on rigid circular surface I faced with problem in contact of pipe which has been modelled by S4 element and the rigid surface which modelled by R3D4 elemnt
 I would like to know
 1 What is the best way for modelling of a 3D circular rigid surface (eg An exterior surface of a quarter of cylinder)
 2What is the command name in ABAQUS for merging of nodes In other softwares like LUSAS or NISA the merge command is used I guess it is MPC in ABAQUS isn＇t it
 3Which parameters should be taken into account when you want to choose a magnitude for increment ie INC
 4 I faced the following WARNING message in msg file What should I do to overcome it What does it mean VALUE OF HCRIT
 ***WARNING OVERCLOSURE OF CONTACT SURFACES SHELSUR and RGDSUR IS TOO SEVERE CUTBACK WILL RESULT YOU MAY WANT TO CHANGE THE VALUE OF HCRIT ON THE *CONTACT PAIR OPTION
(SHELSURF is positive side of pipe and RGDSUR is rigid surface)
 5Finally about print of odb files what is the procedure I couldn＇t find any rough described path in ABAQUSViewer manual
 I seek help of everybody and I do appreciate your help in advance



30原创：限元建立方法希加分
loveestboy1981
探索出关限元单元建立程实限元建立难INP文件通*element改变单元类型单元节点转换限元单元节点致情况单元节点侧（外侧）wwwsimwecom f
       建立方法果位意话希加分肯定
&S vZ@8B7zAyXrC|Simwecom|仿真|设计|限元|虚拟仪器       简单例子作探讨象建立模型划分网格通meshcreat mesh part建立网格单元PART：Part1mesh1然定义装配基础步骤

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然通TOOLSQuery选单元NODE排列号码（首先VIEWPART DISPLAY OPTIONSMESH选择show node labels）选单元node号5407 5408 5434 5433 5121 5122 5148 5147node 5148 514754345433单元节点外侧需INP文件里NODE单元号放面
~+V9x(HDDo
R[_m＇o|Simwecom|仿真|设计|限元|虚拟仪器
]N1ox3Newwwsimwecom[ 帖 loveestboy1981 2006819 2252 编辑 ]



附件
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种情况想单元node号反nodalconectivit改 5121 5122 5148 51475407 5408 5434 5433通修改inp文件首先建立JOB点write input然ULtraEdit开建立XXXINP图想建立限元单元集合单元42514500利ULtraEdit单元42514500节点编号复制新建文件然NODE号改变粘贴覆盖原部分已NODE号改变完成图7图8区



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忘记想建立限元部分进行单元类型修改图然通查节点方法样单元NODE号号调面改变已成功单元类型已改成CIN3D8（三维限单元）谢谢方希家指正
9DG0v*W
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aS }7＼~@pC*YRwwwsimwecom[ 帖 loveestboy1981 2006819 2257 编辑 ]



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31[分享]Abaqus 问答

发信 dengnch (dengnch) 信区 CAD
标 题 Abaqus 问答
发信站 哈工紫丁香 (2003年06月01日104748 星期天) 站信件

Abaqus 问答

Q abaqus图形copy
A file>print>file格式pngAcdsee开

Q Abaqus否计算[Dep]称问题
A step里面edit step话框other里面matrix solver选项

Q 弹塑性矩阵Dddsdde联系
A stressD*strand(stress)ddsdde*d(stran)


Q abaqus中果采umat利构abaqus明白种材料弹塑性应
变说程序返回弹性应变塑性应变output中输出想笨
方法uvarm中定义输出利getvrm获取材料点值法获取增量应力材料常
数等研究帮助中例子umatmst3inpumatmst3for采mises J2 流动理
output history 显示已进入塑性状态PE然0
A uvar( )勉强成功

Q umat作构模型时
*static
1500000000101 时求增量步次增量
*static
1500 时弹性塑性度时出现错误增量出现尖点
A YOU CAN TRY AS FOLLOWS
*STEPEXTRAPOLATIONNOINC2000000
*STATIC
0001500000000101

Q 模型中存两物体接触计算程中报错回事
A 接触问题收敛两方面妨试试：
*CONTACT PAIR 里调试ADJUST参数
二调模型参数FRICTION等

Q 边界条件加载时总initial步然定义加载步请问
initial步作什？掉？
A 掉分析默认步

Q A solid extrusion base feature 句话什意思？
   extrusionrevolution等什意思？
A 两三维建模时候画完二维图形生成三维图形
extrusion意思定厚度然二维图形第三方面伸展形成三维图形

revolution意思定旋转轴二维图形绕旋转形成三维轴称图形

Q 偶umat中调求应力函数
CALL SPRINC(STRESSPSLSTRNDINSHR)
存储应力数组PS中
应力排列序什？
PS1>PS2>PS3
PS1PS1>PS3>PS2
A 第二

Q *USER MATERIAL定义中ΔσΔε偏倒数
DDSDDE称：
material stiffness matrix
UMAT中DDSDDE称：
material＇s Jacobian matrix
请问DDSDDE材料切线刚度矩阵关系什？二者概念？
A 般说样理解：
  σ＝ddsdde*Δε
点常说弹塑性矩阵：Dep

Q 请问field outputhistory output什区？
关键字*node output*node print什区？
A field outputhistory outputviewer模块中明显
field output场量输出history output历史数输出会记录场量时间曲线
  
*node output*node print区写入缀文件*odb*dat
等help中详细介绍 *node outputCARVIEWER做处理二进制文件
*node print写DAT文件中文文件

field output输出模型中较部分（a large portion of the model）输出频
率较变量模型等值线变形图等
history oupput输出模型中较部分输出频率较变量荷载作点 处
荷载位移图等
应力应变位移反力等作field output作history oupput 输
出

Q 学ABAQUS时遇专名词想请教位

1orphan mesh instance
2selfcontact
3elastic foundation
4convective interaction
5amplitude
6solutiondependent state variable
7datum
8thermal film condition
A
1独立网格实体
2接触
3弹性基础弹性基梁
4流相互作
5幅度数值定义时间变化荷载
6赖解状态变量UMAT中常取决某增量步收敛解
7辅助数CAE中常定义数点刚体参考点辅助面等
8知道：）

Q (1)请问MCK矩阵什命令
（2）ABAQUS中实现样东西需滑ABAQUS产生位移场 滑
环境中完成
A （1）试试：*element matrix output
（2）试试输出选项：
*El printPositionaverage at Nodes

Q solutiondependent variable timedependent variable 两种变量什差
？
A solutiondependent variable
字面理解解答关变量值增量结束时变量关常U
MAT中SDV*DEPDV定义数
timedependent variable
字面理解时间关变量常定义时间变化量震荷载等
*APPLITUDE定义

Q S4R单元输出sth(section thickness单元厚度变化)C3D8R输出sth
该单元层厚度方变化
A 觉
定义局部坐标方特异性问题限元材料方计算应力应

变输出材料方假第三方厚度方第三方塑性应变厚
度变化

Q ABAQUS 运行程中较问题常会出现信息：
ABAQUS Info License Timeout set to 70(值) minutes
A 感觉没问题放心吧

Q 计算固结程中msg文件总信息 ***ERROR TOO MANY ATTEMPTS MADE
FOR TTHIS INCREMENT ANALYSIS TERMINATED
改变时间变量行太郁闷收敛？位侠救命请指教什
原
A 原
边界条件 约束够 接触定义单元划分畸变等等

Q
A 觉：
umat实现构没固定方法构必须采方法
断摸索种方法简单加载问题行复杂问题
收敛重点umat中采算法必须consistentddsdde必须正确（
果采back_Euler 方法等算法ddsdde错误时影响结果（简单加载问题没
影响收敛)复杂问题收敛
  
uptonow算法MiseshillJ2J2d等类屈服函数正确具体构
灵活运正学正摸索

时umat需强限元基础采构熟悉颗树吊死
首先确认umat没错误果没收敛（断减加载步长
情况然步长敏感特粘弹性粘塑性变量类材料
构取决背应力计算） 应该考虑换种算法


点体会请家探讨

Q 第次安装abaqus621装完exceed62&3D开始装621Product installation
for network licensing结果进度75时弹出界面
An error ocurred during the move data process 115
ComponentComplete Inslattation
File Group fg_common
Filec＼abaqus＼621＼cae＼External＼ebt＼adi3xcoldll
停止安装重新安装然现感头位心帮帮深感激
A 没关闭防火墙

Q WARNING THE SYSTEM MATRIX HAS 1 NEGATIVE EIGENVALUES
般什情况会发生系统矩阵出现负特征值？
A 情况
边界条件定义接触定义

Q 手册umatmst3for
1）Mises性子程序中调硬化曲线函数中Table（2nvalue）二维数值
保存应力应变曲线数ABAQUS没告诉UMAT中Table数值应力应变数值
啊UMAT里面Table知道呢？
2）RHS＝SMISESSEG3*DEQPLSYIELD式子什意思？尤 3G*DEQPL什意
思？
A Constant＝8中第三开始数值数组名传递

Q 计算时MSG文件出现错误节点数太啦？该处理问题？

ERROR SPECIFIED STANDARD_MEMORY VALUE OF 8000000 IS TOO SMALL TO RUN THE
NALYSIS STANDARD_MEMORY MUST BE INCREASED MINIMUM POSSIBLE VALUE IS
23477555 LOOK AT MEMORY ESTIMATES SECTION OF dat FILE FOR FURTHER
INFORMATION

A abaqus_v6env文件中STANDARD_MEMORY值进行修改
修改Site文件夹abaqus_v6env中配置：
#
# SystemWide ABAQUS Environment File
#
pre_memory 33554432
standard_memory 33554432 ##*********修改里******************
#
# NT specific settings

Q WARNING THE SYSTEM MATRIX HAS 148 NEGATIVE EIGENVALUES
1 ABAQUS VERSION 631 DATE 27NOV2002 TIME 220800 PAGE
For use by None user license from HKS Inc
STEP 1 INCREMENT 1 STEP TIME 000
STEP 1 S T E A D Y S T A T E S
AUTOMATIC TIME CONTROL WITH
A SUGGESTED INITIAL TIME INCREMENT OF 0300
A INITIAL TIME INCREMENT 改试试般出现类问题半
模型问题欠约束者什

Q ZERO PIVOT什意思
A zero pivot理解刚度矩阵出问题例奇异
    原： 模拟软化性质材料该点破坏等原软化
吃劲 模型问题约束够者单元拓扑出错等者UMAT中写[dds
dde]错

Q abaqusuamt老问题缺少 ＇ABA_PARAMINC＇文件
A cvf65调试时显示 缺少 ＇ABA_PARAMINC＇文件
没关系错误ABAQUS调UMAT时候动会找仅仅错误
没影响说ABAQUS中调时候实际存错误FT忘
说句ABA_PARAMINCdpABA_PARAMINCsp拷程序工作空间 应该
ABA_PARAMINCdpABA_PARAMINCsp缀spdp掉ABA_PARAMIN Cdp

ABA_PARAMINCsp改名ABA_PARAMINC
呵呵意思Visual Fortran中调试子程序觉办法时
麽办毕竟ABAQUS中调试非常麻烦UMAT没语法者明显逻
辑错误ABAQUS中调试事半功倍

Q abaqus中没布尔运算？否abaqus中两体粘成体
A constraintinteraction两part进行定位

Q abaqus里做静力分析时加重力加速度？inp文件里card什？
A ：
*DLOAD
ELSET GRAV 981 0 0 1
疑问查*DLOAD卡清楚

Q ABAQUS CAE设定某节点受集中力呢
请问ABAQUS CAE设定某节点受集中力呢？？
CAE中Set象设定节点丫…
请问CAE设定祇inp设定呢？？
A set定义节点
外果节点加集中力没必setLoad模块里creat a load选
择集中力然点中该节点（忘done）输入力数值方
设定节点然cae里点集中荷载挺容易加partition
datumn point
CAE建模型象直接加接点加vertex

Q 两part接起？
   工作分开做完成造型part接起加边界条件载荷
该part接起？
A 先导入File>import>part然形成assembly样做试试

Q abaqu cae中作梁分析时否定义规profile形状？
提供boxpipecircle角钢方钢T型钢l型钢工字钢定义三角
形空心钢者梯形空心钢样profile

A 直接出 I G

Q CAE中建立PART时什先建立XY面模型
CAE中建立PART时什先建立XY面模型直接建立空间点
结点线面体呀
A 图纸画投影图然2维
建模思路种专利直接空间里建立模型然种思路
呢？千秋
CAE熟悉掌握思路整体结果分解partpart简
化面画出投影图extrude回转part空间实体然part
instance指定section特性（材料呀厚度呀等图形显示数）装配
起构成复杂模型
part草图许instance量利装配功减少建立part工
作量
机械图较熟悉想象制作零件然装配成机器程土木类工程师
开始会太惯做例子会熟悉喜欢种操作
果实喜欢空间直接建模法ANSYS建立模型划分单元程序变成AB
AQUS输入文件

Q abaqus功cae中完成？需命令行中输入
A 部分工作CAE中实现功需INPUT文件中修改CAE转化成*INP

abaqus前置确实太 cae功直没长进 板料成形方面回弹分析
cae里完成必须写inp文件做 写inp文件效率直高啊 般成形
动态显示算法回弹静态隐式算法
cae里行建立动态算法step面建立静态算法step
啊abaquscae里面先设置边界条件输出然剖分网格适合数
限元前置处理思路少前置软件样 起前置软件femappatran
工业软件autoformpam－stamp差少啊

Q 面部分加载
A Are you using CAE If so please partition your surface and apply loading

矩形圆区分开圆定义块行
加载面节点设nset行
矩形面画circle 然 tool－中partion

Q 样Abaqus呢？
1)CAE
2）直接填写Keyword文件
3）Python script
4）前处理处理（什前处理呢？Hypermesh？样呢）
A 根具体情况定复杂模型模型CAE中建模 容易模型控制方
式网格 写keyword会累死非相部分简单装配
年师兄C++编程序写斜拉桥input文件input文件N兆佩服佩服 认hype
rmesh前处理软件做复杂模型 python edit国外然
继续开发CAE功方便
限元充分利种工具特点长处
造型剖发网格前置处理
惯思路
ug 造型导出模型 femap者hypermesh 剖发网格 femap作前置导出inp文件 手工
检查inp文件部分性修改 abaqus计算 简单模型cae里作
着patran时学点patran作前置挺

Q 想patran调abaqusini文件中设置
A 问题碰 安装patran时候没装abaqus介质 重新安装patr
an选择户定义安装注意abaqus介质选项

Q AbaqusCAE中施加三角形线荷载？
例根悬臂梁作三角形线荷载
找均布荷载UniformUser Subroutine
简单问题应该复杂吧？
Inp文件中似Dload
Ansys中处理问题～～～～～～～～
A you can use either AMPLITUDE or TABULAR to define load values If it is a
triangle just give a few data from the triangle load line Then when you
define load be sure to specify the name of the AMPLITUDE or TABULAR

Q Abaqus背景黑色？修改？
A 问题呀图片硬拷贝图形软件改变背景啊图片

导出呢？导出什格式呀？
利Abaqusprint功图导出图形文件中具体路径：
File>Print弹出菜单中选print viewport background
renditionwhite&blackcolor
Destinationprinter改file定义file name文件格式PS改
Tiff图形格式文件画笔开插入word中惜图片文件质量太差
抓图质量呢
抓图毛病黑色背景需反色反色热色变成凉色
改变Contour色谱相反排列色谱反色应力高反成黄色着爽
家办法话画笔程序点点改然工作量觉舒
服
试觉直接保存png格式图片较文件较插入w
ord确错需注意保存前legendtitle blockstate block
字体颜色改黑色背景改喜欢颜色样效果会更清图
文字

Q ABAQUS建模问题：建立复合材料模型呢？
CAE文档知道建立列模型
建立圆柱体高度H半径R＝X1中x2>R>0材料1X1>R>x2材料2CAE
中实现？考虑接触两种材料性相差请高手指点
A 想应该首先建立两种材料定义
然assign命令模型部分分配材料
操作？首先建立圆柱PART然建立2种材料2种材料分配P
ART INSTANCE部分？者2直径PART组装整体？请指教
   would like to answer your question although I have never played around
Abaquscae Since the geometry of the model is simple (a cylinder) my
solution is you do not have to use cae and you manually write your input
file or rewrite the input file generated by abaquscae I guess I am kind of
cheating in answering your question However I think some hints could be
helpful
1) Again take advantage of the symmetry if possible If this is an
axisymmetrical problem you need to model only a plane Maybe a quarter model
2) When you define the elements use elset to group two different elements
such as
elset elsetmaterial1 generate
1100
200300
elset elsetmaterial2 generate
101199
which means the elements from #1 to #100 and from #200 to #300 are one
material while elements from #101 to #199 are the other
Then you could define material properties by

material namematerial1

material namematerial2


32[转帖]abaqus64导入外模型点验
abaqus64CAE建模功太强许情况助第二第三方软件完成模型建立导入程中总会少存问题做方面试验点发现解释：

1三维模型proe等CAD软件建出模型存成igessatstep等格式导入abaqus直接感觉satstep格式出现模型iges文件导入

2复杂模型导入abaqus时模型已枝离破碎法通修补模型改分网相困难通第三方前处理软件hypermesh实现模型导入时出错问题hypermesh导入模型格式相般CAD软件格式导入毛病通清理完成然加abaqus模板hypermesh分出高质量网导出inp直接abaqus目前相强强联合CAE思路

3时种方式导入模型：ansys现国受众群想许会ansys起码基建模做发现ansys建模功相abaqus强尤现workbench点更突出惯abaqus建模朋友暂时会专业CAD软件朋友直接ansys里建想模型然导入abaqus里强计算功吧

    a曲线救国：ansys里建模型通hypermesh导入分网导进abaqus（说细情况hypermesh版找）
  b2d草图abaqus接收iges格式ansys做2d模型通fileexport导出iges文件然abaqus导入sketch（ansys建模型时出现areaentitysketch认线点ansys通linekeypoint完成建模型轮廓导入应该没什问题时导入效果autocad导入效果

4说说2d模型导入问题点版里问CAE法做出诸椭圆正弦余弦曲线等复杂面图形通常通autocad作出图形存dxf格式然导入abaqus时会出现导入sketch时什没条张已总导入成功实abaqus导入sketch图形仅线点两种形式重点abaqus导入dxf时认cad版目前autocad版已2004时果存dxf格式时选 2004版承认dxf格式导入abaqus时会成功果时选择较低版dxf格式存储时问题会解决（存低版dxf格式保存时选择）做试验存目前说低autocad R12版R13版dxf格式时导入abaqus里导入信家试试说明点限abaqus导入dxf格式功 限制常见种图形直接圆矩形等线形式出现（abaqusdocumentation里介绍）复杂曲线点形式出现（拟合成曲线）复杂点曲线导入会N点然点曲线愁出现嘛？

两种方法直接点点连起样会产生点曲线拟合度太spline方法样线点序连成曲线会想曲线相差（推荐spline方法样仅产生条线分网处）试试吧（然果点相果没耐心没办法）

版友iloveni说autocad作图时便捷图形直接画直接直线画图形诸矩形正六边形等快捷作图方式作图样导入会出现直线否出现体现图形形状定位顶点做工作abaqus里线点连起

点体会试反正通应该没什问题家补充

33abaqus图层绘图
abaquscae默认视区仅仅绘出图形譬contor图变形图x－y曲线图等实abaqus里面存类似origin里面图层概念前视区里面图形建立图层图层合图形里面称Overlay Plot譬副图中左边绘出contor图右边绘出x－y图等等abaqus里面操作简单
STcwZBb^}L7HSimWe仿真坛1首先进入视化模块然先开模型数文件（odb）
2第步先创建图形譬变形图等等
3进入view里面overlay plot点击creat创建图层现viewport layer里出现创建图层
4注意创建图层visible 面选择标记表示视区里面图层否见autocad里面样取消见current表示否前图层操作前图层操作效cad name建立图层名称属性值模型数库图形类型关般改动 S
5重复24步创建图层
Z5G B5f~6创建选择plotapply视区显示出见图层
34子结构
子结构超单元（两者点区文会谈）子结构abaqus里面新东东限元里面概念谓子结构组单元组合单元（称超单元）注意单元单元种类型单元样 @6S u9J5OT3d
2什子结构
ooYSM4N7KN仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM 子结构玩建型限元模型兄弟碰计算问题花时两天甚单元太法求解情况子结构正针类问题种解决方法子结构肯定型限元模型譬求解非线性问题时候非线性问题系统次迭代次系统刚度矩阵会重新计算般说型问题部分变形部分作子结构刚度矩阵仅计算次节约计算时间
3情况子结构
        nx5i}2S(r[B前面提非线性问题包括变形者线弹性部分子结构特模型中相部分时提例子桌子四条腿四条腿作子结构（基时弹性变形）包括实体单元提高效率问题确实太采子结构问题分成块计算出结果次采子结构分块计算直块单独计算止
4abaqus中子结构特点注意问题
子结构组单元集合子结构中仅仅指定节点度会保留节点度消节点均通线性插值方式获求解
M k[DWK|Simwecom|仿真|设计|限元|虚拟仪器子结构通指定节点单元建立联系abaqus64版中子结构概念没超单元区子结构求单元部准确解超单元行定义子结构时候包含太单元单元刚度矩阵集成时候会花掉太时间更含较少单元子结构代
9QhE|yG仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent5abaqus中子结构法
J＼GzwMSimWe仿真坛般包括部分首先利substructure generateretained nodal dofs定义子结构然定义子结构部荷载边界条件旦已定义子结构象利般单元样子结构譬输出请求等等容太外文章述家直接手册注意abaqus cae支持子结构

35分析步改变材料参数
3dYe6wk9Uy        HrCSimWe仿真坛 解概三种方法：
J^lL1w]ey4AA仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM1强然采umat方式需深厚限元基础般推荐
2采场变量功相简单
S|sA)h＼T*wRFwwwsimwecom 3采abaqusimport命令前面分析结果传递新分析中
＼]q8t c2j*X*W
dSimWe仿真坛里介绍第二种方法

R@jK[I
ki3m3USimWe仿真坛*什场变量|Simweco
＼

谓场变量理解环境变量建立材料参数间中介然直接指定材料参数分析步具值通场变量间接达目
8S4qmq7[6Z)pwwwsimwecom*样场变量
r0N6KhVj
s|Simwecom|仿真|设计|限元|虚拟仪器实场变量较实热力学流体力学分析种里介绍仅仅固体力学中法
1定义场变量
*initial中指定场变量值格式
initial conditionstype＝fieldvariable＝n（场变量编号）
f&Xy^s
Inp{仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent Set－1（定义结点集）10（场变量值）
场变量通编号识次定义场变量
*直接分析步中指定场变量值格式
*field variable1uV^        e
Set11
2GM8gP FA4x|Simwecom|仿真|设计|限元|虚拟仪器然时initialfield指定场变量改变时默认材料参数增量步间线性变化
zN+i&]6B5gl仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent
8N＇Ex
iCwwwsimwecom2建立材料参数场变量间联系9tHs&V3|(T
果caeprop模块里面材料参数般Number of field variables场变量1开始选择场变量填入场变量值材料参数间关系譬 SimWe仿真坛
T c ^{8Ng7wtP
杨模量 泊松 field1
U3Cq(mI200E9 03 1|S
180E9 03 2
RRTEaSimWe仿真坛果命令格式inp文件里面键入：
*ELASTIC DEPENDENCIES1 wwwsimwecomTMZ4a3eH`
200E9 03 1
180E9 03 2
7K2J+~n+U3v(a)Wq仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent第四参数表示场变量值＇}
3注意
场变量分析步中值分析步中指定果没指定材料参数默认微场变量1值例
(G*4AxVo{仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent*STEPnamestep1

*STATIC
B0Z&Ci6Vjs Y#{SimWe仿真坛*FIELD VARIABLE1
NALL 1
6＼ S}rB仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM *END STEP
*STEPnamestep2
1yiz3}X
{SimWe仿真坛*STATIC
k+q*KD+kA仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent *FIELD VARIABLE1SimW
NALL 2
*END STEP

`^ WzPQhSimWe仿真坛cae步支持场变量必须更改inp文件
PR6@HU*||Simwecom|仿真|设计|限元|虚拟仪器4技巧
＇Xm
cjb_+A9EO仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM 果材料参数变化较复杂般利副职曲线定义场变量值变化
*FIELD VARIABLE1amplitude＝？？？
+x7^
@K8Iw仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent 幅值曲线步清楚手册仿真

36模型重启动分析－restart
理说restart应该算分析技巧常识呢朋友没建型模型导致restart较少介绍

bwwwsimwecom1什restart
job包含step果模型会样种情况花天夜终分析时候发现the first step边界条件设置问题真晴天霹雳重新低二天发现电脑restart时问帝how can i do
o lmM)IiIaLlH5k        ＼仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent*restart复杂模型分析程分成阶段甚increatment step阶段阶段结果进行检验然进入阶段进行分析

5ed~&dz9H*HSimWe仿真坛2重启动需文件
standard说resmdlsttprtodb文件重启动explictabqsttprtodb
l(WJ^|+B仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent仿
3分析中设置重启动生成文件
里介绍standard法 实简单
inp文件里面加入*RESTART WRITE FREQUENCYN
1{g4Z＇wQf_仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentcae默认加入重启选项step－>output>restart request里面设置输出频率frequency
*技巧：res文件包含模型全部信息非常设置overlay参数面数覆盖吊前面数restart话增量步开始
x#DKfh#@bYH仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluent 4重启
TnQmMSimWe仿真坛指定重启点
inp文件里面加*RESTART READ STEPstep INCincrementcae中更简单首先model－>edit attribute里面选择restart指定前面分析job名想重启动开始分析步增量步然job里面指定重新创建工作类型restartthat＇s all
8udt        o_        6t`B8T仿真分析限元模拟计算力学航空航天ANSYSMSCABAQUSALGORAdinaCOMSOLFEMLABMatlabFluentCFDCAECADCAM
        p#K#Q|{uSimWe仿真坛 5注意
dlm&b^e R)Z重启动改变原始分析中参数说启动点模型必须原始分析中模型完全致企图采restart方法改变边界条件材料参数者网格密度等等需外技巧实现

37 ABAQUS单位心

Quantity
SI
SI (mm)
US Unit (ft)
US Unit (inch)
(Lxcad)cm
Length
m
mm
ft
in
cm
Force
N
N
lbf
lbf
N
Mass
kg
tonne (103 kg)吨
slug
lbf s2in
(102 kg)
Time
s
s
s
s
s
Stress
Pa (Nm2)
MPa (Nmm2)
lbfft2
psi (lbfin2)
Ncm2
Energy
J
mJ (10–3 J)
ft lbf
in lbf

Density
kgm3
tonnemm3(1012)
slugft3
lbf s2in4
102 kgcm3(108)
Ace
ms2
mms2


cms2

单位建议采国际单位制
采mkgNs国际单位制时重力加速度98ms2质量kg 密度7850 kgm3
MPEX1210e9
MPDENS17850
ACEL98

采mmTon Ns时重力加速度9800mms2 密度7850e12 Tonmm3应力MPa
MPDATAEX1206e3
MPDATAPRXY103
MPDATADENS1785e9
ACEL009800
力质量*加速度 关系：Nkgms20001t1000mms2tmms2


采cm McmNs时重力加速度980cms2力N 密度7850e8 Mcmcm3
MPDATAEX1206e5
MPDATAPRXY103
MPDATADENS17850e8
ACEL00980
力质量*加速度 关系：Nkgms2001Mcm100cms2Mcmmms2
中Mcm100kg

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