LS-Dyna orthotropic material model with viscoelasticity in different direction

- June 18, 2025 at 5:53 pm
  
  Dennis Chen
  Subscriber
  
  Hello, does LS-Dyna have a material model that can handle orthotropic material that's also viscoelastic in each of the 3 ortrhogonal directions.
  basically, is it possible to define prony series terms for each of the 3 axis of an orthotropic material model? If this isn't possible, is there a material model that can do this?
  this is not a duplicate from the one in Ansys Mechanical section, I am looking at both solvers.
- June 19, 2025 at 1:36 pm
  
  Ram Gopisetti
  Ansys Employee
  
  Hi Dennis Chen,
  There is a MAT_213 COMPOSITE_TABULATED_PLASTICITY_DAMAGE material model that supports viscoelastic behavior in all three axes. Please refer to Card 9 of this material model for details regarding the viscoelastic formulation. For a deeper theoretical understanding, you may also consult the following resource: https://lsdyna.ansys.com/wp-content/uploads/attachments/t5-2-c-composites-131.pdf. Additionally, it would be helpful if you could provide the commercial or trade name of the material in question to offer more precise recommendations.
  Best regards,
  Ram
- June 19, 2025 at 10:58 pm
  
  Dennis Chen
  Subscriber
  
  Ram, thank you. do you know if Ansys Mechanical/APDL have something similar to Mat_213? I will make sure to look into this. Thank you.
  I won't risk mentioning work related stuff on these forum posts but I really appreciate your info
  Best