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一三维六面体试件,尺寸30mm×10mm×10mm,顶底面位移固定,底面温度200度,顶面温度20度,求在试件内部产生的热应力。下面是我的apdl流程文件,出现错误信息:Large negative pivot value(-0.458137512) in Eqn.system.
May be because of a bad temperature-dependent material property used in the model. 请教各位高手,该如何解决?
/BATCH
finish
/clear
/PREP7
!参数定义*
ET,1,SOLID70
MP,KXX,1,0.0234
BLOCK,0,30,0,10,0,10,
/RGB,INDEX,100,100,100, 0
/RGB,INDEX, 80, 80, 80,13
/RGB,INDEX, 60, 60, 60,14
/RGB,INDEX, 0, 0, 0,15
!网格划分
Lsel,s,line,,1,3,2
LESIZE,all, , ,10
Lsel,s,line,,6,10,2
LESIZE,all, , ,10
Lsel,s,line,,11,12,1
LESIZE,all, , ,10
Lsel,s,line,,2,4,2
LESIZE,all, , ,30
Lsel,s,line,,5,7,2
LESIZE,all, , ,30
vmesh,1
FINISH
/solu
antype,static
!施加温度载荷
nsel,s,loc,x,0
d,all,temp,100
nsel,s,loc,x,30
d,all,temp,10
nsel,all
Outpr,basic,all
solve
finish
/PREP7
!单元类型转换
ETCHG,TTS
!单元力学参数
MP,EX,1,5e10
MP,PRXY,1,0.25
MP,ALPX,1,5e-6
nsel,s,loc,x,30
cp,7,ux,all
nsel,s,loc,x,0
cp,8,ux,all
nsel,all
finish
/SOL
!*
ANTYPE,0
!施加边界条件
nsel,s,loc,x,0
d,all,ux,0
nsel,s,loc,x,30
d,all,ux,0
tref,20 !定义参考温度
LDREAD,TEMP,,, ,,,rth
allsel
solve
finish |
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