Answer:
The difference between the two material models is as follows:
- In the Isotropic Nonlinear Elastic 1D material model, no plastic deformations are considered. This means that the material returns to its initial state after the load relief.
- In the case of the Isotropic Plastic 1D material model, the plastic deformation is considered.
For both material models, you have to define the nonlinear properties in an additional dialog box. When entering data by means of a diagram, it is possible for both models to define the distribution after the last step.
The "Isotropic Nonlinear Elastic 1D" material model allows for the anti-symmetric input of the stress-strain diagram (different for the positive and negative zones), whereas the "Isotropic Plastic 1D" model only allows for symmetric input.
