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Anybody can share an educational notes, Power Points or a video lecture in writing User-defined material subroutines (UMAT).

Well, Please read the manual (theory) in each version, and try to realize that how displacement can be determined where the model is subjected to thermal loading. I can guess the solver is probably upgraded in new version.

Hi, alright. We now know the degree of geometry non-linearity is important. Well, I suggest you that review the [highlight #3465A4]solver[/highlight] in both version. Is that a big difference between results?

Hey there! Do a trial test. You model a simple version of your problem in both version. Compare the results. I am happy to see the outcomes!

First of all, Abaqus might have a very good user interface,but the solver in coupled simulation is not generally as good as ANSYS. Anyway, to those have a concern about "Creep Analysis" Steady state (Secondary creep), the strain rate only depends on stress. Hence, You need A,n as...