Hello everyone,

I am working on Impact simulation on a bilayered composite with interface cohesive zone element. For the eight-node cohesive zone elements I am using traction separation law and defining max stress damage. In the results I did not observe any element deletion in cohesive layer. May I know the reason behind this problem. Herwith, I have attached the material parameters.

*Material, name=Cohesive*Damage Initiation, criterion=MAXS 2.68e+08, 1.92e+08, 1.92e+08*Damage Evolution, type=DISPLACEMENT 2.12e-09,*Density1090.,*Elastic, type=TRACTION 6.6752e+07, 2.24e+07, 2.24e+07