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我要模拟的是一个圆筒,对其竖向和环向加压,我约束的方法是:取1/8筒体,高度取一半,程序如下:
/SOLU
ANTYPE,STATIC
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!施加约束!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!位移边界条件
CSYS,1
!下底面位移边界条件:取井壁的一半进行模拟,所以底面采用DSYM命令
ASEL,S,,,2
NSLA,S,1
DSYM,SYMM,Z,1
!两个侧面的约束
ALLSEL
NSEL,S,LOC,Y,0
DSYM,SYMM,X,1
NSEL,S,LOC,Y,45
DSYM,SYMM,X,1
!将上表面位移耦合
ASEL, ALL
ASEL,S,,,1
NSLA,S,1
CP,1,UZ,ALL
DA,1,UX
但是在output窗口中却提示我:
*** ERROR *** SUPPRESSED MESSAGE CP= 670.744 TIME= 20:46:56
The value of UZ at node 497 is 2.561317298E+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.
*** ERROR *** SUPPRESSED MESSAGE CP= 670.744 TIME= 20:46:56
*** 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 497 in the UZ direction to check for stiffness (slope of the
curve) approaching zero.
难道我得约束还不对吗??
急盘各位的指点,谢谢!! |
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