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Stress Softening in UMAT

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Posts: 22
Topic starter
(@Anil Karumuri)
Eminent Member
Joined: 13 years ago

Hi all,

I am implementing the constitutive behaviour of CuAlNi shape memory alloy during uniaxial loading using UMAT. My question is that:

Stress decreases during phase transformation in our model but I cant do this in UMAT. When stress is needed to decrease, abaqus job stops and there is no change in the command window. I wonder that is there anything which I can do when stress starts to decrease in UMAT? It can be in input file or subroutine file.

Thank you.

Naz&#305,m Babacan

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Posts: 3998
Joined: 5 years ago

You should be able reduce the stress in a UMAT without problems. I do that quite frequently.
I suspect that there is something else going on in your case 🙁


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Posts: 83
Trusted Member
Joined: 17 years ago


... perhpas?