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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › *MAT_058 / *MAT_LAMINATED_COMPOSITE_FABRIC – Stress Strain curves in WB › Reply To: *MAT_058 / *MAT_LAMINATED_COMPOSITE_FABRIC – Stress Strain curves in WB

November 22, 2023 at 11:49 pm
Reno Genest
Ansys Employee

Hello,

I don't think it is possible in engineering data. You can define *MAT_058 in engineering data:

But, if you define negative values for Ea, Eb, and Ec for example, Workbench will expect real values and will apply the units to it so that in the input.k file, -1 becomes -1E-6, -2 becomes -2E-6, and -3 becomes -3E-6. And so it does not work.

The best way to do this would be to use a command snippet in Mechanical and define the *MAT_058 card this way:

 

The negative value for Ea, Eb, and Ec correspond to a load curve for the stress vs strain. You can define the load curves (*DEFINE_CURVE) using a command snippet at the environment level:

 

 

Let me know if this helps or not.

 

Reno.