Elastic nonlinear

[tangzhen]

Hi, I want to find some material which is related to elastic nonlinear . I mean ,for example , when this elastic nonlinear material is set to a truss element ,it behaves like an element set to Material Steel02 when under pressure, and behaves like element set to Elastic Uniaxial Material .
I am wondering whether Opensees can solve this problem and how to do it. Thanks a lot.

[fmk]

not quite sure i understand the question. could you rephrase it.