Nitinol vs. Non-linear Material Model

Discussion created by Guest on Nov 2, 2006
I have been modelling a Nitinol part using the Nitinol material model. However, my experimental stress strain data shows that the material is not perfectly linear during the initial part of its curve. The Nitinol model does not seem to allow for this. In the past, this material would have been modeled using a non-linear material approach.

Is there any other benefit to using the Nitinol model over a Non-linear model in this case? or is there any way to model this type of behavior in the Nitinol model?