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Thanks again.

yep, I don't need to calculate AC yield, when stress is greater than the initial yield stress, then it's '1'.

However, I sent an email to ABAQUS for this question, it seems they...

Thanks a lot for your response. But here are the problems.

1, According to my understanding, AC yield is just a yes/no flag. That means it is either '1' or '0', we don't need to calculate it,...

Dear Jorgen,

Thank you very much for your reply.

But I am still confused that I am not using any state variable about AC yield output. So, I have no idea what I shall do.

Here is the...

Dear buddies,

As far as I know, the output variable AC YIELD is only available for built-in material models. You need to use a state variable to track this in your UMAT.
But I don't know what...