Linear material properties are typically defined via the MP family of commands, and nonlinear material properties require the TB family of commands. (The TB command can also be used to input some linear material properties, such as anisotropic elasticity, material structural damping, and piezoelectric matrix.)

Material properties can be temperature-dependent, and some can be defined as a function of primary variables. The material library file capability enables you to store frequently used materials for future use.

Also see the Material Reference for detailed information about specific material models.