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Hyperelastic UMAT using *Soils - non-convergence  


victor.crespo
Posts: 1
(@victor-crespo)
New Member
Joined: 6 months ago

Hi everyone,

I am trying to model fluid flow through a porous material. I have modeled the solid matrix in UMAT as a type of hyperelastic material, and I would like to use the SOILS consolidation to do the analysis, however, even though according to the following thread it seems doable, it seems like it's not working when I use *Soils.

It's an unconconfined compression simulation. The problem is defined as a displacement control problem and I want to model a Stress-Relaxation process. I'm applying 10% strain using a tabular amplitude:

  • 0s, 0  
  • 1s, 1
  • 5s, 1

I have examined a couple of test cases:

  • I tested the input file using Abaqus built-in elastic material for the solid matrix, solving with *Soils, and it works fine and I get what I expected.
  • I tested the input file using Abaqus UMAT elastic material for the solid matrix, solving with *Soils, and it works fine and I get what I expected.
  • I have checked the UMAT using the same input file only with a simple static step, and replacing the elastic solid matrix with the UMAT. That works fine too.

The pore pressure showed a discontinuous profile like this: 

Please let me know if you have any experience with this.

Thanks 🙂

Victor

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