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发表于 2004-6-10 09:12:08
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来自 上海徐汇区
回复: 【讨论】请教个问题 , 欢迎cafe0519进来. About UMAT
I also think that Bro. cafe is so modest
In UMAT, you will update the stress, the Jacobi matrix and the SDVs, and
don't forget that the Newton-Raphson numerical algorithm is used to solve
the nonlinear equations, so the order of which is calculate first is really not
important as you imagine, since at last all the updated values have to be
converged.
In spite of the above fact, I suggest that you could update SDVs first
since they are functions of strains, then update stress and DDSDDE
using the calculated SDVs, at last update the SDVs again using the
calculated stress.
Of course, it is your own duty to ensure the correctness of your constitutive
relations and the corresponding numerical algorithm. |
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