请高手帮我看看我这个分析问题出在哪
我做了一块玻璃板的受热膨胀分析，我将板的四周设uz方向约束，参考温度303K，处于403k的温度下，稳态分析，用solid5单元，为什么做出来的结果膨胀得不对称，而且每次结果膨胀的方向都不一样，还是说不需要用热-结构耦合，直接用结构分析就行了？而且为什么用solid5单元它用非线性的计算了/PREP7
!*
ET,1,SOLID5
!*
TOFFST,0
!*
MPDATA,DENS,1,,2.51e-6
MPDATA,EX,1,,72900
MPDATA,PRXY,1,,0.208
MPDATA,ALPX,1,,7.2e-6
MPDATA,KXX,1,,0.00096
SAVE
TYPE, 1
MAT, 1
REAL,
ESYS, 0
SECNUM,
!*
ESIZE,0.03,0,
CM,_Y,VOLU
VSEL, , , , 1
CM,_Y1,VOLU
CHKMSH,'VOLU'
CMSEL,S,_Y
!*
VSWEEP,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
SAVE
FINISH
/SOL
!*
ANTYPE,0
TREF,303,
FLST,2,4,5,ORDE,3
FITEM,2,2
FITEM,2,4
FITEM,2,-6
!*
/GO
DA,P51X,UZ,
TUNIF,403,
SAVE
/STATUS,SOLU
SOLVE http://home.simwe.com/attachment/200903/6/362117_1236317113ncm9.jpg 1# takikoyx
结果图，合位移
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