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UMAT from stress strain in multiscale modeling

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Posts: 5
Topic starter
(@Treadwell)
Active Member
Joined: 11 years ago

Hi all,

I am using multiscale modeling in my analysis. This is what I am trying to do:

-After solving the RVE problem on microscale, I got the stress-strain relationship realated to my RVE and now I need to create a UMAT soubroutines for abaqus in order to call it at the integration points of the macro model.

Is there a possibility to create a UMAT from stress-strain curve related to a representative volume element? How can I do that? Could you please give me an hint?

Thank you very much in advance for your help

Best regards

Yas

7 Replies
Posts: 5
Topic starter
(@Treadwell)
Active Member
Joined: 11 years ago

Does anybody know that?????????

[QUOTE=ytam,10430]Hi all,

I am using multiscale modeling in my analysis. This is what I am trying to do:

-After solving the RVE problem on microscale, I got the stress-strain relationship realated to my RVE and now I need to create a UMAT soubroutines for abaqus in order to call it at the integration points of the macro model.

Is there a possibility to create a UMAT from stress-strain curve related to a representative volume element? How can I do that? Could you please give me an hint?

Thank you very much in advance for your help

Best regards

Yas

7 Replies
Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

You can create a material model from stress-strain data if you select to use a simple material model, like linear elastic, Marlow, elastic-plastic.
It is indeed more difficult to do that for general material response!

-Jorgen

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Posts: 5
Topic starter
(@Treadwell)
Active Member
Joined: 11 years ago

Dear Dr. Bergstrom,

Thank you very much for your reply. I was wondering if I can create a UMAT with a general material response. And I have a question: for example say I have a general material stress-strain curve with an increasing non-linear elastic part followed by a non-linear softening part and this behavior is periodic (as shown in the picture, but with the same peak for example), how can I simulate that behavior? Can I create my own material model for that?Hope its clear.

Thank you very much for your time

Best regards

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Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

Material models are usually created based on insight into the micromechanisms creating the macroscopic response.
What material are you studying?

Does your figure show stress relaxation behavior, damage, or something else?

-Jorgen

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Posts: 5
Topic starter
(@Treadwell)
Active Member
Joined: 11 years ago

Dear Dr. Bergstrom,

Yes the figure shows relaxation behavior in polymeric structures and I was wondering if it is possible to create a UMAT for that particular trend of stress-strain curve.
Thank you very much for your help,

Best regards

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Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

I have developed a number of UMATs that can capture that type of response. So it is certainly possible.

-Jorgen

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