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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › Mohr_Coulomb material model (MAT_173) › Reply To: Mohr_Coulomb material model (MAT_173)

November 21, 2024 at 4:31 pm
Pedram Samadian
Ansys Employee

Hi,

Please check the following thoughts about the possible sources of error:

  • Ensure you are outputing a right variable for the shear stress. The "maximum shear stress" needs to be output, not any shear stress components in the stress tensor. 
  • Revisit the input material parameters in the material card and verify their values and unit consistency. LS-DYNA Theory Manual and Keyword User's Manual (LSDYNA Manuals) are good resources for the better understanding of this material card and its parameters.
  • Make sure that the material passes the yield strength. 
  • Use a fully integrated elemen type.
  • Run the model with multiple elements to see if you can get what expected.

I hope there are helpful.

Thanks,

Pedram