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北京石油化工学院2026年研究生招生接收调剂公告
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zdy_derive

新虫 (初入文坛)

[求助] 跪求大神看看这个命令流哪里有问题,好人一生平安!!!! 已有1人参与

命令流如下:
finish
/clear
/PREP7   
!*  
ET,1,SOLID45
ET,2,SOLID65
et,3,SOLID65
!*  
MP,EX,1,4800      
MP,EY,1,4800   
MP,EZ,1,51500  
MP,PRXY,1,0.02
MP,PRYZ,1,0.02
MP,PRXZ,1,0.27
MP,GXY,1,2353  
MP,GYZ,1,2353  
MP,GXZ,1,20275           
mp,ex,2,20000           
mp,nuxy,2,0.25           
tb,concr,2           
tbdata,,,,2,20         
mp,ex,3,1.5e4            
mp,nuxy,3,0.2            
tb,dp,3                  
tbdata,1,4,30,10
r,1$r,2$r,3
!
CYLIND,16,0,-300,1500,0,90,
CYLIND,50,16,0,1500,0,90,   
CYLIND,500,50,0,1500,0,90,
!
allsel,all
vsel,s,,,1      
aslv,s
lsla,s
lplot
lesize,1,,,4
lesize,2,,,4
lesize,3,,,6
lesize,4,,,6
lesize,5,,,4
lesize,6,,,4
lesize,7,25
lesize,8,25
lesize,9,25
type,1
mat,1
real,1
mshape,0,3d
mshkey,0
vsweep,all
!*
!
allsel,all
vsel,s,,,2      
aslv,s
lsla,s
lplot
lesize,10,,,4
lesize,11,,,6
lesize,12,,,4
lesize,13,,,6
lesize,14,,,6
lesize,15,,,4
lesize,16,,,6
lesize,17,,,4
lesize,18,25
lesize,19,25
lesize,20,25
lesize,21,25
type,2
mat,2
real,2
mshape,0,3d
mshkey,0
vsweep,all
!*
!
allsel,all
vsel,s,,,3      
aslv,s
lsla,s
lplot
lesize,23,,,6
lesize,25,,,6
lesize,26,,,6
lesize,28,,,6
lesize,22,50
lesize,24,50
lesize,27,50
lesize,29,50
lesize,30,50
lesize,31,50
lesize,32,50
lesize,33,50
type,3
mat,3
real,3
mshape,0,3d
mshkey,0
vsweep,all
!*
allsel,all
!
save
!
!
mp,mu,4,0.4   ! 修改  
mat,4
r,4,4
real,4
et,4,170
et,5,174
KEYOPT,5,9,0
KEYOPT,5,10,2
nropt,unsym       ! 不对称矩阵完全牛顿—拉普森法
!*generate the target sunface
allsel,all
asel,s,,,9
cm,target1,area
type,4
nsla,s,1
esln,s,0
esurf
!*generate the contact sunface
asel,s,,,3
cm,contact1,area
type,5
nsla,s,1
esln,s,0
esurf
!
allsel,all
eplot
!
!*CONTACT PAIR CREATION - END
mp,mu,5,0.7       ! 修改
mat,5
r,5,4
real,5
et,6,170
et,7,174
KEYOPT,7,9,0
KEYOPT,7,10,2
nropt,unsym
!*generate the target sunface
allsel,all
asel,s,,,15
cm,target2,area
type,6
nsla,s,1
esln,s,0
esurf
!*generate the contact sunface
asel,s,,,8
cm,contact2,area
type,7
nsla,s,1
esln,s,0
esurf
!
allsel,all
eplot
!*CONTACT PAIR CREATION - END
save
!
!*
/solu
da,4,symm   !对称约束
da,5,symm
da,10,symm
da,11,symm
da,16,symm
da,17,symm
da,13,all
da,14,all
da,7,all
!
antype,0
nlgeom,1          !大变形
autots,on  !自动时间步
neqit,50   !子步最大迭代次数
pred,on    !非线性分析预测器(加速收敛)
!
solcontrol,on,on
!
nropt,full,,on      !定义H法选项(270)
nsubst,20,10000,2   !子步数
time,100            !时间
allsel,all
solve
!*
nsubst,100,10000,10
outres,all,all
autots,1
time,200
asel,s,loc,z,-300
sfa,all,,pres,-10        !修改荷载值
allsel,all
solve


错误提示为:
*** ERROR ***                           CP =      51.231   TIME= 12:26:52
The value of UZ at node 67 is 1.342765716E+09.  It is greater than the  
current limit of 1000000.  This generally indicates rigid body motion   
as a result of an unconstrained model.  Verify that your model is      
properly constrained.                                                   

*** ERROR ***                           CP =      51.387   TIME= 12:30:06
*** MESSAGE CONTINUATION ---- DIAGNOSTIC INFORMATION ***               
If one or more parts of the model are held together only by contact     
verify that the contact surfaces are closed.  You can check contact     
status in the SOLUTION module for the converged solutions using         
CNCHECK.                                                               

*** ERROR ***                           CP =      51.480   TIME= 12:30:22
*** MESSAGE CONTINUATION ---- DIAGNOSTIC INFORMATION ***               
Rigid body motion can also occur when net section yielding has         
occurred resulting in large displacements for small increments of load  
or when buckling has occurred.  You can plot the time history curve     
for node 67 in the UZ direction to check for stiffness (slope of the   
curve) approaching zero.
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Captain_DYX

新虫 (初入文坛)

【答案】应助回帖

感谢参与,应助指数 +1
约束不足,检查一下你的约束设定情况。
如果不是约束的问题,应该就是接触参数没搞对,看下接触面和目标面是否设对。
建议在求解层加一下命令:
allsel,all
cncheck,auto
2楼2016-01-10 23:00:02
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