Hi Shukla,


I'm algo simulating a compression test of cross-laminated timber, with orthotropic elastic properties along with hill's plasticity criterion and isotropic bilinear hardening. You have to know the nature of the material you ara simulating, then you can choose the correct constitutive behavior for it. Tell os  what material you're dealing with. If it is metal or concrete, maybe you can use von mises criterion, which suits well for isotropic materials.