Nonlinear

Click the Nonlinear button in the Analysis Specific Data section of the Material form. The following window pops up:

There are four options supported in the Nonlinear Material Data:

• None: For Linear Elastic material, which is the default, as shown in the above figure.
• Nonlinear Elastic: For Nonlinear Elastic material.
• Elasto-Plastic (Bi-Linear): For Elasto-Plastic type material.
• Plastic: For Plastic type material.