<POROUS_CRITERION> rousselier

Description

The Rousselier model is a thermodynamics model formed by coupling the plasticity and damage through free energy. The criterion is defined as below:

\[\frac{\sqrt{3J_2}}{1-f} + \sigma_1 f D \exp\left( \frac{I_1}{3(1-f)\sigma_1 } \right) -\sigma_\star\]

with the coefficients \(\sigma_1\) and \(D\) named sigma1 and D. Although the Rousselier model is very similar to the Gurson model, a major point of difference between the two is that in Rousselier model the damage grows under pure shear and the non zero shear deformation occurs under pure hydrostatic pressure due to the shape of the yield function.

Syntax

*porous_criterion rousselier \(~\,\) coefficients \(~\,\) …

Example

A simple example from a test case is given below

*porous_criterion rousselier
  sigma1  200.
  D      0.85