模拟橡胶密封圈。

chenjie120123

在橡胶的三边都采用了接触，左侧施加水压载荷。但是出现 One or more elements have become highly distorted.  Excessive           
distortion of elements is usually a symptom indicating the need for     
corrective action elsewhere.  Try incrementing the load more slowly     
(increase the number of substeps or decrease the time step size).  You  
may need to improve your mesh to obtain elements with better aspect     
ratios.  Also consider the behavior of materials, contact pairs,        
and/or constraint equations.  If this message appears in the first      
iteration of first substep, be sure to perform element shape checking. 错误。谁能告诉我橡胶分析该怎么约束，最好提供命令流。

chenjie120123

各位大虾求指导啊，。。。。

chenjie120123

我在左侧施加位移载荷可以计算，但是施加压力载荷就计算不了？这是怎么回事？               除非在橡胶中心节点约束其x，y方向位移才能计算？但是这个不符合实际情况。这种加载压力该怎么处理？

chenjie120123

已经解决了，是最后设置载荷步的问题。

/prep7
et,1,plane182
et,2,169
et,3,172
et,4,plane42

mp,ex,1,14.04
mp,nuxy,1,0.499
mp,mu,1,0.2
TB,HYPER,1,,2,MOONEY
tbdata,1,1.87
tbdata,2,0.47
mp,ex,4,2e5
mp,nuxy,4,0.3

R=7                          ! RADIUS OF CYLINDER，（mm）
a=50                       !外度宽
h0=24                      !外部高
b=24                       !槽宽
c=12                        !槽深
h=6                       !上板厚


blc4,-a/2,0,a,h0
wprota,,,-90
wpoffs,,,b/2
asbw,all
wpoffs,,,-b
asbw,all
wprota,,-90
wpoffs,,,h0-c
asbw,all
asel,s,loc,x,-b/2,b/2
asel,r,loc,y,h0-c,h0
adele,all,,,1
allsel,all

wpcsys,-1
wpoffs,b/2-r,h0-c+r
csys,4
cswpla,11,1
cyl4,0,0,r
csys,0

wpcsys,-1
wpoffs,0,h0-c+2*r
blc4,-a/2,0,a,h


allsel,all
asel,s,loc,x,b/2-2*r,b/2
asel,r,loc,y,h0-c,h0-c+2*r
csys,0
wpcsys,-1
wpoffs,b/2-r,h0-c+r
wprota,,90
asbw,all
wprota,,,90
asbw,all
cm,rubber_area,area
aatt,1,2,1
esize,1
mshkey,1
amesh,all

allsel,all
cmsel,u,rubber_area
aatt,4,,4
esize,2
amesh,all
allsel,all


！！！接触对
r,1
type,2
mat,1
real,1
lmesh,12
lmesh,15
lmesh,21
csys,11
nsel,s,loc,x,r
type,3
real,1
esurf
allsel,all



cmsel,u,rubber_area
allsel,below,area
csys,0
nsel,r,loc,y,h0-c+2*r+h
CP,1,UY,ALL
*GET,NCEN,NODE,,NUM,MIN        ! GET MINIMUM NODE NUMBER FROM SELECTED SET
allsel,ALL

nsel,s,loc,y,0
d,all,all,0
allsel,all

nsel,s,loc,x,-a/2
nsel,r,loc,y,h0-c+2*r,h0-c+2*r+h
d,all,ux,0
nsel,s,loc,x,a/2
nsel,r,loc,y,h0-c+2*r,h0-c+2*r+h
d,all,ux,0
allsel,all

/solu
nlgeom,on
solc,on
OUTRES,ERASE
OUTRES,all,all
autots,on
nsubst,20,1000,10

time,1
D,NCEN,UY,-1.7
allsel,all
lswri,1


lsel,s,,,4,7,3
SFl,all,PRES,5  
allsel,all
time,2
lswri,2

LSSOLVE,1,2,1,