From FreeCAD Documentation
- To create a new MaterialMechanicalNonlinear object do the following:
- To edit an existing MaterialMechanicalNonlinear object:
- Select it in the Tree view.
- Select the material model (isotropic (simple) hardening or introduced in version 1.0: kinematic hardening).
- Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the ... button next to DataYield Points to input the points using a user-friendly list. The syntax is described in the Notes section.