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VUMAT viscoelasticity (Maxwell model)

surot's picture

Dear all,

I would like to ask you for advice. I am about to simulate a pull-through test (see attached picture) of a cladding panel made of a material with highly viscoelastic behaviour. I have parameters for Maxwell model (Prony series) obtained from test. I expect large deformation and probably cone failure (or tearing of the cladding panel). Therefore I would like to use Abaqus/Explicit. The problem is that I cannot use *visco step together with Explicit. Is there any way to solve it?

I found VUMAT for Kelvin-Voight but do you think I could use this simple formulation in this case? Have you come across generalized Maxwell implementation for VUMAT? 

Thanks in advance.

 

 

AttachmentSize
Image icon pull-through.PNG18.99 KB

Comments

Frank Richter's picture

Hello Surot

just give it a try and see if the result matches your data.

How is this pull-through achieved ? By suction induced by vacuum ? You might check the literature on thermoforming, a process where a disk is heated and then makes contact with a mold.

I advise you to subscribe to and seek assistance from the ABAQUS mailing list
https://groups.yahoo.com/neo/groups/Abaqus/info
Search the archive of the list before posting in it.
The list does not accept attachments.

If you have a UMAT for generalized Maxwell implementation, you might also look at this interface:
https://soilmodels.com/download/vumat_umatinterface-zip/
No comment from me on that; I never worked with it.

If that Kelvin-Voigt VUMAT somewhere available on the Internet ? Just curious, I was also searching for that a few years ago.

Good luck,

Frank

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