你使用的是一个壳单元吧,而且是节点在中心。如果使用两个壳单元就可以解决这个问题,其中一个壳单元节点偏置一个在顶部,另一个壳单元节点偏置在底部,上下两面用第一个壳单元,左右两面用第二壳单元,下面是我做的一个图,附件有命令流,供你参考
/PREP7
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ET,1,SHELL99
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KEYOPT,1,2,0
KEYOPT,1,3,0
KEYOPT,1,4,0
KEYOPT,1,5,0
KEYOPT,1,6,0
KEYOPT,1,8,0
KEYOPT,1,9,0
KEYOPT,1,10,0
KEYOPT,1,11,1
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ET,2,SHELL99
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KEYOPT,2,2,0
KEYOPT,2,3,0
KEYOPT,2,4,0
KEYOPT,2,5,0
KEYOPT,2,6,0
KEYOPT,2,8,0
KEYOPT,2,9,0
KEYOPT,2,10,0
KEYOPT,2,11,2
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*SET,_RC_SET,1,
R,1
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RMODIF,1,1,3,0,0,0,0,0
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RMODIF,1,13,1,0,0.1,1,0,0.1,
RMODIF,1,19,1,0,0.1,
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*SET,_RC_SET,2,
R,2
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RMODIF,2,1,3,0,0,0,0,0
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RMODIF,2,13,1,0,0.1,1,0,0.1,
RMODIF,2,19,1,0,0.1,
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MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,200e9
MPDATA,PRXY,1,,0.3
K,1,0,0,0,
K,2,1,0,0,
K,3,1,1,0,
K,4,0,1,0,
K,5,0,0,1,
LSTR, 1, 2
LSTR, 2, 3
LSTR, 3, 4
LSTR, 4, 1
LSTR, 1, 5
FLST,2,4,4,ORDE,2
FITEM,2,1
FITEM,2,-4
ADRAG,P51X, , , , , , 5
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LESIZE,ALL,0.05, , , ,1, , ,1,
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,
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MSHAPE,0,2D
MSHKEY,1
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FLST,5,2,5,ORDE,2
FITEM,5,1
FITEM,5,3
CM,_Y,AREA
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
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AMESH,_Y1
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CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
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APLOT
TYPE, 2
MAT, 1
REAL, 2
ESYS, 0
SECNUM,
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FLST,5,2,5,ORDE,2
FITEM,5,2
FITEM,5,4
CM,_Y,AREA
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'
CMSEL,S,_Y
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AMESH,_Y1
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CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
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/SHRINK,0.5E-01
/ESHAPE,1.0
/EFACET,1
/RATIO,1,1,1
/CFORMAT,32,0
/REPLOT
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