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我在用Shell99自定义输入本构矩阵,计算出错如下:
*** WARNING *** CP = 43.602 TIME= 09:15:08
Input matrix of element 1 has terms on its main diagonal whose maximum
ratio exceeds 1.0e9. Accuracy may be poor.
*** ERROR *** CP = 43.899 TIME= 09:15:11
The value of UZ at node 11 is 1.343948114E+11. 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.
看起来是本构矩阵输入的时候有问题。但是我检查了一下,没发现什么问题,请各位大神帮我找找。
另外我发现,如果载荷是面内载荷,结果正确;但是面外载荷就会出错,如FZ。
完整代码如下:
FINISH
/CLEAR,START
A11=1.0989
A22=1.0989
A12=0.3297
A66=0.3846
D11=0.0916
D22=0.0916
D12=0.0275
D66=0.0321
a = 2.7
b = 1.56
/PREP7
ET,1,SHELL99
KEYOPT,1,2,4
R,1,A11,A12,0,A22,0,A66,
RMORE,0,0,0,0,0,0,
RMORE,D11,D12,0,D22,0,D66,
RMORE,,,,,,,
RMORE, ,1, , , , ,
!*
BLC4,-a/2,-b/2,a,b
ESIZE,b/2,0,
AMESH,all
!*
FINISH
/SOLU
ANTYPE,STATIC
nsel,s,loc,x,-a/2
D,all, , , , , ,UX,UY,UZ
nsel,all
*get,nnodez,node,0,count,
F,all,FZ,-1/nnodez
ALLSEL
SOLVE
FINISH
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