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Ansys Learning Forum › Forums › Discuss Simulation › LS Dyna › D3 failure parameter in *MAT_015 (JOHNSON_COOK) › Reply To: D3 failure parameter in *MAT_015 (JOHNSON_COOK)

January 26, 2024 at 8:19 pm
Armin
Ansys Employee

Hi Rong, 

Could you include the definition of Johnson-Cook failure criterion from the paper you mentioned above?
It is possible that, in the paper, D3 is multiplied by hydrostatic stress rather than pressure. Pressure is simply the negative of hydrostatic stress and that may explain the difference.