twhohen
twhohen
@twhohen
Eminent Member
Joined: Sep 28, 2018
Last seen: Jul 19, 2022
Topics: 0 / Replies: 21
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RE: Determination of viscoelastic parameters (Prony or relaxation test data)

Shabnam, I'm not sure I understand your question. The Prony series, for instance a Maxwell model simulating stress relaxation, can be expressed ...

3 months ago
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RE: Need help validating hyperelastic VUMAT

Thanks Fred. Glad you got it working. I usually run my rubber simulations with distortion control, reduced integration, linear element, and hourglassi...

3 months ago
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RE: Need help validating hyperelastic VUMAT

Fred, Did you test your subroutine in planar tension and equibiaxial loading modes? If not, I would check those modes before moving on to simple she...

3 months ago
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RE: Correcting Tensile Stress-Strain Data when Strain Is Computed from Crosshead Displacement

@castello , Yes, the paper was recently published and is available here: METHOD TO GENERATE ACCURATE ELASTIC AND HYPERELASTIC UNIAXIAL TENSION STR...

3 months ago
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RE: Hyperelastic model acting too stiff

My browser is not working well. Has anybody answered yet? Your deviatoric parameters do look problematic. I also doubt you need 3 coefficients to mo...

2 years ago
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RE: Understanding VUMAT code written in Mechanics of Solid polymers Textbook.

You can find an updated VUMAT posted on this website here: I can share a paper with you that discusses VUMAT implementation in Abaqus. Search "Travi...

2 years ago
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RE: obtaining gr normalized relaxation modulus from relaxation data

I see. Glad you found an approach that may work for your study. I recently ran into a similar issue. I collected stress relaxation data, but the tim...

2 years ago
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RE: Advantages off the Bergstroem-Boyce-Model compared to a Prony-Series

stewie6514, I think you have answered your own question. The Prony series is quite limited because it assumes that, for instance, stiffness monotoni...

2 years ago
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RE: obtaining gr normalized relaxation modulus from relaxation data

I-Cabeza, I have not used the functionality in a while, but if I recall correctly, normalizing your relaxation data the way you have done is fine fo...

2 years ago
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RE: Stop ABAQUS simulation after failure

trcc20, I regularly stop simulations using the first method you describe above. From what you've written, it appears you are aware that you can open...

2 years ago
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RE: VUMAT for Hyperelastic Materials - Update to Bergstrom's Example

@fat32ntfs, I have not personally tried matrix multiplication in my codes, but I have some that do (for example, search "Shawn Chester New Jersey In...

2 years ago
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RE: VUMAT for Hyperelastic Materials - Update to Bergstrom's Example

@fat32ntfs, Yes, it looks like zero is not defined. I never encountered problems validating this version of the code, so my compiler must have been ...

2 years ago
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RE: Correcting Tensile Stress-Strain Data when Strain Is Computed from Crosshead Displacement

Great, thank you Jorgen. If you (or anybody else) gets around to a test-drive, let me know if you have any questions. At some stage, hopefully this ye...

3 years ago
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RE: Material selection for sealing component

Are you still working on this? What differential pressure must you seal? What is driving you to a foam instead of a typical rubber seal?

3 years ago
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