请问：轴对称问题
3维的圆柱体中心施加集中力载荷，但是为了简便，我建了2维轴对称结构模型，底部限制运动，向原点处的节点施加集中力，见图，为什么求解不收敛，并且显示节点316 zero radius at Gauss Point？好像变形得很厉害。。。附上我的代码。。。http://forum.simwe.com/templates/simwe/images/attachimg.gif http://forum.simwe.com/attachments/day_100413/1004131909924e66a2c755b1af.png.thumb.jpg 下载 (3.85 KB)
求解后的变形图
1 分钟前
/PREP7
ET,1,PLANE182
KEYOPT,1,1,0
KEYOPT,1,3,1
KEYOPT,1,6,0
KEYOPT,1,10,0
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,60E3
MPDATA,PRXY,1,,0.45
RECTNG,0,0.0225,0,-0.0045,
AATT, 1, , 1, 0,
FLST,2,1,5,ORDE,1
FITEM,2,1
AESIZE,P51X,0.0005,
MSHAPE,0,2D
MSHKEY,1
CM,_Y,AREA
ASEL, , , , 1
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
AMESH,_Y1
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
FINISH
/SOLU
ANTYPE,0
ANTYPE,0
NLGEOM,1
NSUBST,200,1000,10
OUTRES,ERASE
OUTRES,ALL,ALL
AUTOTS,1
TIME,100
FLST,2,1,4,ORDE,1
FITEM,2,1
/GO
DL,P51X, ,ALL,0
FLST,2,1,4,ORDE,1
FITEM,2,4
/GO
DL,P51X, ,UX,0
FLST,2,1,1,ORDE,1
FITEM,2,56
/GO
F,P51X,FY,-1.024
SOLVE
我是看见ansys 11.0的help里关于对称单元的载荷：
All nodes along the y-axis centerline (at x = 0.0) should have the radial displacements (UX if not rotated) specified as zero, unless a pinhole effect is desired. At least one value of UY should be specified or constrained to prevent rigid body motions.
所以设置了ux＝0（x＝0），但求解为什么还会有问题呢？ 图形看不到
轴对称模型做起来确实很复杂
模型很简单
但是边界条件是人去设定的轴对称边界条件
所以，总有可能失误！
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