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发表于 2003-6-17 22:01:24
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来自 黑龙江哈尔滨
回复: 【求助】一个瞬态的温度场怎么和结构耦合?
非常感谢管理员大哥的帮助!
我先做温度场的瞬态分析,然后做应力分析,将每一个载荷步的温度值用ldread,temp,i,, ,,, rth倒进来,可结果感觉总也不对。
总出现提示:The calculated reference FORCE CONVERGENCE VALUE = 4.997996045E-02 is less than the default minimum of 1 (MINREF field of CNVTOL command). Check results carefully.
The calculated reference HT FLOW CONVERGENCE VALUE= 0 is less than the default minimum of 1E-6 (MINREF field of CNVTOL command). Check results carefully
这到底是怎么回事?好像温度没加上一样?
我做的这个分析,是严重的非线性,比热、热导率、、弹性模量、泊松比等材料性能几乎都和温度有关。
像这种严重的非线性不能用这种间接耦合的方法来做吗?
还是别的问题?希望斑竹及其他高手不胜赐教,非常感谢!
下面是我的命令流,请大家帮我看看:
/COM, Structural
/prep7
/TITLE,residual !改变文件名字
etchg,tts
TOFFST,273
mp,ex,1,28e6 !定义弹性模量
!考虑弹塑性
TB,BKIN,1,1
TBTEMP,25
TBDATA,1,120e3,0
!
mp,nuxy,1,0.3
mp,alpx,1,0.9e-5
lsclear,solid
!
mptemp,1, 25,100,200,300,400,500
mpdata, nuxy,2,1,0.269,0.27,0.26,0.312,0.309,0.308
mpdata,ex,2,1,209,207,202,196,186,174
mptemp,1,100,200,300,400,500,600,700
mpdata,alpx,2,1,11.7e-6,12.43e-6,13.13e-6,13.67e-6,14.1e-6,14.17e-6,14.76e-6
!热膨胀系数
csys,0
nsel,s,loc,y,0
D,all,Uy,0 ! Apply structural boundary conditions
TREF,25
!
save
finish
!
/solu
antype,transient,
CNVTOL,u !xiugai
!Lnsrch,on !xiugai
!nlgeom,on
allsel,all
trnopt,full
lumpm,0
Solcontrol,on
!!!!
!
allsel
t=0
dt=0.1 !扫描一个单元所需时间,与激光扫描速度有关
*DO,i,2,5,1
allsel,all
nsel,all
BFVDELE,all,TEMP
ldread,temp,i,,,,,rth
!t=t+dt/2
t=t+dt
time,t !每一载荷步结束时的时间
deltim,0.01,0.01,0.01,on
kbc,1
neqit,50
autots,on
timint,on,struc
outres,all,last
solve
save
*ENDDO
eplot
save
来这里寻求大家的帮助,万分感谢! |
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