Increase of stiffness in the Mohr-Coulomb Material Model

Hi all,

I am running into trouble with the increase of stiffness in the Mohr-Coulomb Material Model. I am using Plaxis 3D conect Edition V21.

The increase in stiffness in the Model is linear, while my stiffness is parabolic. Is there a way to adapt a parabolic change into the Mohr-Coulomb Model or is there a Material Model where the stiffness can change in parabolically over the depth?

Thank you for your time

Jesco

Parents
  • Jesco,

    You could do it by developing your own user defined version of the MC model, but this is a very advanced undertaking, and I wouldn't do it unless I was working on a PhD which required it, and I had a lot of spare time to test it. The HS model has a power law stress dependent stiffness. However the stress stiffness would change  during your analysis and probably not what you're looking for. You could use the brute force method of defining  a series of horizontal layers and assigning MC materials to each layer with parabolically increasing stiffness.

    Maybe someone else had some better ideas. 

    Martin

    Answer Verified By: Dennis Waterman 

Reply
  • Jesco,

    You could do it by developing your own user defined version of the MC model, but this is a very advanced undertaking, and I wouldn't do it unless I was working on a PhD which required it, and I had a lot of spare time to test it. The HS model has a power law stress dependent stiffness. However the stress stiffness would change  during your analysis and probably not what you're looking for. You could use the brute force method of defining  a series of horizontal layers and assigning MC materials to each layer with parabolically increasing stiffness.

    Maybe someone else had some better ideas. 

    Martin

    Answer Verified By: Dennis Waterman 

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