请教双金属片热应力的等双轴应力状态

Question

请问需要哪些条件或者那些情形下，可以应用等双轴应力状态来计算应力应变？即：ε=δ(1-γ)/E谢谢!

Answer 1

下面是一个完整的热应力分析的命令流，能运算、能求解、能读结果，但是是错误的，因为无论怎样改变变温过程中物体的杨氏模量值，最后算出的热应力值总不变，ansys计算热应力是按照最初的参考温度与当前温度及材料性能计算的，而不是将上一步计算的温度值作为下一子布的参考温度。我想问怎样设置才能使参考温度定义为上一子布的计算结果。难道ansys在设计时就没考虑过这个问题吗？另外改变变温过程中热容、密度、导热系数等的值，最后结果的温度值会变化，所以整个命令流的其他部分应该不会有问题。附带的命令流fini/clea/filname,example-1/prep7ET,1,solid5mp,ex,1,1.5e11mp,prxy,1,0.3mp,kxx,1,400mp,alpx,1,1.5e-5mp,c,1,500mp,dens,1,5000!定义材料温度属性mptemp,1,20,50,80,100,140,180mpdata,ex,2,1,1.88e10,1.8e10,1.6e10,1.4e10,1e10,0.6e10mpdata,prxy,2,1,0.3,0.3,0.3,0.3,0.3,0.3mpdata,alpx,2,1,0.7e-5,0.7e-5,0.7e-5,3.4e-5,3.4e-5,3.4e-5mpdata,dens,2,1,2000,2000,2000,2000,2000,2000mpdata,c,2,1,500,500,500,500,500,500mpdata,kxx,2,1,300,300,300,300,300,300block,0,0.05,0,0.02,0,0.02block,0.05,0.07,0,0.02,0,0.02block,0.07,0.12,0,0.02,0,0.02vglue,allnumcmp,allvsel,s,loc,x,0.05,0.07vatt,2,,1allsel,allesize,0.004vmesh,allvplot,allda,5,ux,0da,5,uy,0da,8,ux,0da,8,uy,0fini/solvantype,4trnopt,fullnlgeom,1nropt,fullToffst,273tref,175outres,all,alltunif,175timint,offtime,0.01allsel,allsolvetime,60timint,onnsubst,10,12,5autots,onkbc,0asel,u,,,6,7,1sfa,all,1,conv,1000,25allsel,alllswrite,1kbc,0time,62timint,onasel,u,,,6,7,1sfa,all,1,conv,1,0vsel,s,mat,,2bfv,all,hgen,8e6allsel,allnsubst,4,6,2lswrite,2kbc,0time,70timint,onasel,u,,,6,7,1sfa,all,1,conv,1000,25vsel,s,mat,,2bfv,all,hgen,8e6allsel,allnsubst,8,12,5lswrite,3lssolve,1,3,1,/post1SET,firstPLNSOL, TEMP,, 0,1.0SET,NEXTPLNSOL, TEMP,, 0,1.0!……