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zdy_derive

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注冊: 2015-11-25
專業(yè): 巖土與基礎(chǔ)工程

[求助] 跪求大神看看這個命令流哪里有問題，好人一生平安�。。�！已有1人參與

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    ! 不對稱矩陣完全牛頓—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 !對稱約束
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       !大變形
autots,on  !自動時間步
neqit,50 !子步最大迭代次數(shù)
pred,on !非線性分析預(yù)測器（加速收斂）
!
solcontrol,on,on
!
nropt,full,,on    !定義H法選項（270）
nsubst,20,10000,2 !子步數(shù)
time,100          !時間
allsel,all
solve
!*
nsubst,100,10000,10
outres,all,all
autots,1
time,200
asel,s,loc,z,-300
sfa,all,,pres,-10       !修改荷載值
allsel,all
solve

錯誤提示為：
*** 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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1樓 2016-01-10 14:54:00

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Captain_DYX

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注冊: 2016-01-10

【答案】應(yīng)助回帖

感謝參與，應(yīng)助指數(shù) +1

約束不足，檢查一下你的約束設(shè)定情況。
如果不是約束的問題，應(yīng)該就是接觸參數(shù)沒搞對，看下接觸面和目標(biāo)面是否設(shè)對。
建議在求解層加一下命令：
allsel,all
cncheck,auto

贊一下

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2樓2016-01-10 23:00:02

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