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updating displacements in umat

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Posts: 17
Topic starter
(@Denials)
Active Member
Joined: 14 years ago

I wrote umat routine for finite strains which is working for one increment. When I run job with more increments, tangent modulus and stress update just fine except displacements and logarithmic strains. Problem is obviusly in updating (my guess), but I am not sure where could I miss updating some of variables. I wrote some umat codes for small strains where I updated ddsdde and stress and everything worked just fine. I am doing same thing in this code. Am I missing something? Is there any other variable I should update?

Please help!

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Posts: 5
(@latin)
Active Member
Joined: 13 years ago

Hello,

how did you find out, that the stresses are ok but not the strains? Or got I your question wrong?
For finite strains the procedure is the same: you have to update only the stresses and DDSDDE.

Viktor

2 Replies
Posts: 17
Topic starter
(@Denials)
Active Member
Joined: 14 years ago

I have a few benchmark examples where I know solutions. On this examples I try all new codes. Anyway, I managed the problem. Thanks for your reply Viktor!

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