adding nonlinear material properties?

Bonjour!
I have an orthotropic material with only one young modulus out of three that exhibits a nonlinear behaviour, i managed to propose a model for it ( based on an exponential function) and my question would be:
Is there a way to add such material to sw library for nonlinear analysis???

All help is highly ( i mean like up up up) appreciated

Thanx

Laila

SolidworksSimulation