【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
我做一个三维的热应力分析,可是求解出现了下面的错误。有些晕了,不知道是什么原因,还请高手指点。多谢!*** WARNING *** CP= 41.000 TIME= 10:03:52
Constraint on area 21 with inactive load label TEMP not transferred to
nodes.
*** WARNING *** CP= 41.016 TIME= 10:03:52
Constraint on area 22 with inactive load label TEMP not transferred to
nodes.
*** ERROR *** CP= 162.531 TIME= 10:07:16
The value of UY at node 6 is 596688389.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.
/COM,ANSYS RELEASE7.1 UP20030501 10:35:55 09/03/2004
我的命令流文件如下:
/config,nres,1000000
/Prep7
ET,1,solid90,0
MP,EX,1,1.73e11
MP,KXX,1,30
MP,C,1,734
MP,DENS,1,7.77e3
MP,PRXY,1,0.3
MP,ALPX,1,12.4e-6
/TRIAD,OFF
CYL4, , ,0.1968,-90,0.3048,90,1.018
wpoff,0,0,0.1524
wprot,-50
wprot,,,90
CYL4, , ,,0,0.0254,360,0.3048
wprot,0,-20,0
VSBV,1,2
CYL4, , ,,0,0.0254,360,0.3048
wprot,0,-20,0
VSBV,3,1
CYL4, , ,,0,0.0254,360,0.3048
wprot,0,-20,0
VSBV,2,1
CYL4, , ,,0,0.0254,360,0.3048
wprot,0,-20,0
VSBV,3,1
CYL4, , ,,0,0.0254,360,0.3048
VSBV,2,1
wprot,,30
wprot,,,-90
SMRT,4
MSHAPE,1,3D
MSHKEY,0
VMESH,all
/solu
antype,static
DA,21,TEMP,571,1
DA,22,TEMP,500,1
outres,all,all
solve
finish
/prep7
etchg,tts
DA,1,UZ,0
DA,5,UX,0
DA,6,UX,0
SFA,21,1,PRES,25.84e6
SFA,9,1,PRES,25.84e6
SFA,10,1,PRES,25.84e6
SFA,11,1,PRES,25.84e6
SFA,12,1,PRES,25.84e6
SFA,13,1,PRES,25.84e6
SFA,14,1,PRES,25.84e6
SFA,15,1,PRES,25.84e6
SFA,16,1,PRES,25.84e6
SFA,17,1,PRES,25.84e6
SFA,18,1,PRES,25.84e6
SFA,5,1,PRES,-14290000
SFA,6,1,PRES,-14290000
SFA,2,1,PRES,-18460000
ldread,temp,,,,,'file','rth'
solve
回复: 【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
正如提示所说,你给模型施加的约束不够导致求解失败。DA,1,UZ,0
DA,5,UX,0
DA,6,UX,0
仅给出了UX、UZ方向约束,Y向呢?引起 The value of UY at node 6 is 596688389. It is greater than the current limit of 1000000. 错误。
根据实际情况把约束加上去就可以求解了,这个模型虽然是四面体分网,但质量还可以。
回复: 【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
我似乎明白了一些道理,可是模型在UY方向没有约束,是对称模型,在UY方向可以自由膨胀。原型是一圆管道,上面开孔,受热后可以膨胀,我取了对称的一半模型。还请明示回复: 【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
取对称,就要设置对称边界条件。回复: 【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
哦,谢谢anite的指点。我再试试了回复: 【讨论】请教高手我做的三维热应力分析,出现的错误是什么原因?
对呀,取对称就要施加对称边界,用display里面的symmetry
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