Hi ametist , why do you are looking for adding GISSMO to the deck, why not model the material with damage criteria. Many inbuilt LSDYNA support good material models such as Johnsone cook with 4 damage variables or Steinberge Guinan Strength for ductile material or use JH1or JH2 material model for the Brittle Material, is there any reason for choosign the GISSMO model. why dont use the simple plastic strain (EPS ) criterial to model the damage by looking into histroy variables. Can you able to elobrate the use of the your model.n