对称约束模型接触面不起作用出现自由侵入问题

模型为上下对称,顶部的接触起作用,为什么底部的接触面不起约束作用,接触面可以自由侵入,接触分析命令流如下:

fini
/clear
/prep7
et,1,182
et,2,169
et,3,171
keyopt,3,10,2
mp,mu,2,0.2
mp,ex,1,2e8
mp,prxy,1,0.46
k,1,0,1.45
k,2,2,1.45
k,3,2,1.74
k,4,4.39,1.74
k,5,4.39,1
k,6,0.4,1
k,7,0.4,-1
k,8,4.39,-1
k,9,4.39,-1.74
k,10,2,-1.74
k,11,2,-1.45
k,12,0,-1.45
l,1,2
l,2,3
l,3,4
l,4,5
l,5,6
l,6,7
l,7,8
l,8,9
l,9,10
l,10,11
l,11,12
l,12,1
al,all
k,13,0,1.74
k,14,5,1.74
lstr,13,14
k,15,0.4,-1.74
k,16,5,-1.74
lstr,15,16
esize,0.06
type,1
mat,1
smrtsize,5
amesh,all
nsel,s,loc,x,0
d,all,all,0
allsel
/com ****Topand bottom rigid targets ****
r,2
type,2
real,2
mat,2
lesize,13,,,1
lesize,14,,,1
lmesh,13,14
/com ****Contact on the planar seal ****
type,3
lsel,s,line,,9,
lsel,a,line,,3,
nsll,s,1
esurf
allsel,all
finish
/solu
allsel
esel,s,ename,,169
nsle
nsel,r,loc,y,1.74
d,all,uy,-0.240
allsel
esel,s,ename,,169
nsle
nsel,r,loc,y,-1.74
d,all,uy,0.240
nlgeom,on
time,1
nsubst,25,2000,5
outres,all,all
allsel
nropt,unsymUnsymmetric due to friction
solve
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