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发表于 2005-11-21 20:25:43
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来自 西安交通大学
Re:请教:接触的力的施加方式,在这种情况下.......?呵呵,又要麻烦大侠们了
按照184的描述如果定义刚体的dof约束就属于过约束问题(很不明白为什么,也迫切想知道),但是去掉对184的所有约束计算仍然无法进行下去。
不过到真是没了过约束的警告,取而代之出现了其它的警告:
*** WARNING *** CP = 11.641 TIME= 20:03:43
Pivoting option activated for Sparse Direct Solver. The memory
required may greatly exceed predicted amount. In that event rerun
with increased memory using -m option (refer to the Basic Analysis
Procedures Guide, Ch. 19).
这个好像是说预置内存太小,不过这个好像不归我管吧!
*** WARNING *** CP = 12.016 TIME= 20:03:44
There are 3 small equation solver pivot terms.
EQUIL ITER 1 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= 253.4
Element Formation Element= 1000 Cum. Iter.= 2 CP= 12.500
Time= 0.33333 Load Step= 1 Substep= 1 Equilibrium Iteration= 2.
F Convergence Norm= 2.5667 Previous Norm= 2.5667
这个警告就不明白了
*** WARNING *** CP = 13.359 TIME= 20:03:46
Contact element 12016 (real ID 1) status changes abruptly from contact
(with target element 13003) -> no-contact.
Element Formation Element= 10000 Cum. Iter.= 2 CP= 14.875
Time= 0.33333 Load Step= 1 Substep= 1 Equilibrium Iteration= 2.
F Convergence Norm= 2.5667 Previous Norm= 2.5667
LINE SEARCH PARAMETER = 0.5000E-01 SCALED MAX DOF INC = 12.67
FORCE CONVERGENCE VALUE = 148.3 CRITERION= 0.1406E-01
12016单元的状态突然有接触改为非接触状态?为什么?它刚好是在两个平面接触的中间啊!
*** WARNING *** CP = 17.906 TIME= 20:03:59
There are 3 small equation solver pivot terms.
EQUIL ITER 2 COMPLETED. NEW TRIANG MATRIX. MAX DOF INC= -2.918
Element Formation Element= 1000 Cum. Iter.= 3 CP= 18.078
Time= 0.33333 Load Step= 1 Substep= 1 Equilibrium Iteration= 3.
F Convergence Norm= 148.28 Previous Norm= 2.5667
LINE SEARCH PARAMETER = 1.000 SCALED MAX DOF INC = -2.918
FORCE CONVERGENCE VALUE = 9.393 CRITERION= 0.1312E-01
这个警告重复出现
************************************************************************
Error messages discontinued after 5 messages were displayed.
好像出现的错位讯息太多了:(
REASON FOR TERMINATION. . . . . . . . . .ERROR IN ELEMENT FORMULATION
又碰到这个讨厌的终止了~~~~~~~~~
真郁闷!!!
RESTART BY RE-RUNNING THE ANALYSIS
ALL CURRENT ANSYS DATA WRITTEN TO FILE NAME= slid.db
FOR POSSIBLE RESUME FROM THIS POINT
下面是我的命令流 ,基本都是照抄kevin大哥的(表表见怪︿_︿)
~SATIN,ATM0.3,sat,'G:\ANSYS\ATM\AutoCAD\',SOLIDS,0
/VIEW,1,,,1
/PREP7
*SET,BTH,1.5 !基体厚度
*SET,MTH,0.04 !带子厚度
*SET,LEN,3.84 !带子的长度
*SET,LEF,-3.36 !球左侧带子的余留(密网格)
*SET,FMS,768 !带子横向划分网格数
*SET,FTK,4*FMS/(100*LEN) !带子纵向划分网格数
*SET,INT,LEN/FMS !单元长度(目标单元)
*SET,FOR,-0.6 !带子受力
*SET,PIMU,0.3 !摩擦系数
*SET,LRM,1.28 !稀疏网格划分长度
*SET,SMS,LRM/(2*INT) !稀疏网格数
ET,1,PLANE42
ET,2,TARGE169
ET,3,CONTA171 !接触单元
ET,4,TARGE169
ET,5,CONTA171
keyopt,1,3,2
et,6,mpc184
keyop,6,1,1 !set option for beam behavior, MPC184
!POM
MP,EX,1,3000,
MP,DENS,1,1.405E-9,
MP,ALPX,1,60E-8,
MP,NUXY,1,0.3,
MP,MU,1,PIMU,
MP,KXX,1,0.4
MP,C,1,1E10,
!PI材料属性
MP,EX,2,9314 !弹性模量
MP,DENS,2,1.43E-9, !密度
MP,ALPX,2,45E-6,
MP,NUXY,2,0.2 !泊松比
MP,MU,2,PIMU, !摩擦系数
MP,KXX,2,0.35 !热传导率
MP,C,2,9E9, !比热
TB,MISO,2,1,13 !定义材料非线性(按照材料属性,表中的弹性模量应该服从递减规律)
TBPT,,0.00596,55.5
TBPT,,0.00752,68.9
TBPT,,0.01013,90.2
TBPT,,0.01143,98.2
TBPT,,0.01273,106.1
TBPT,,0.01533,118.9
TBPT,,0.01794,128.6
TBPT,,0.02054,136
TBPT,,0.02315,143.3
TBPT,,0.02575,147.5
TBPT,,0.04138,165.2
TBPT,,0.07627,193.3
TBPT,,0.11846,225
AGEN, ,1, , , ,1.54, , , ,1 !移动面
MAT,1
ADEL,1
L,8,3
A,3,4,5,6,7,8
LESIZE,6,,,50
LESIZE,7,,,25
LESIZE,5,,,2
LESIZE,4,,,10
LESIZE,3,,,40
LESIZE,9,,,25,5
AMESH,1
A,1,2,3,8
LESISE,2,,,50,0.05
LESISE,1,,,10
LESISE,8,,,50,20
AMESH,2 !铲子的网格生成
ALLSEL
NUMCMP,NODE
*GET,MN,NODE,,NUM,MAX
RECTNG,LEF-LRM,LRM+LEN+LEF,1.5,1.54
LESIZE,10,,,FMS+4*SMS
LESIZE,11,,,FTK
LESIZE,12,,,FMS+4*SMS
LESIZE,13,,,FTK
MAT,2
AMESH,3 !PI网格划分
n,20000,56,18.6
type,6
e,20000,1181
*repeat,11,,1
R,1 !定义接触
LSEL,S,,,6
NSLL,R
REAL,1
TYPE,3
ESURF
ALLSEL,ALL
LSEL,S,,,12
NSLL,R
REAL,1
TYPE,2
ESURF
ALLSEL,ALL
lsel,s,,,11
lsel,a,,,13
nsll,,1
d,all,ux
allsel
lsel,s,,,10
nsll,,1
d,all,uy
allsel
!d,20000,uy !without those constaint,the program can process but cannot convergence and be terminated finally
!d,20000,uz
!d,20000,ROTY
!d,20000,ux
!d,20000,rotx
f,20000,mz,100
/solu
nlgeom,on
nsub,3,3,3
allsel
solv |
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