I'm working with a transversely isotropic material with a nonlinear (elastic-plastic) response under compression. I'm looking into the nonlinear buckling of this material, and to do so I'm using MAT040 as the material card in LS-DYNA. However, it fails to recognize the nonlinearity in the stress-strain curve I've introduced under LCDIA. The AOPT I'm using is 2.0, and I've changed the axes respectively.
Any help with this is appreciated :)