3.3. User Defined Materials

See Also

• The Role of the Material Model in Continuum Mechanics
• Defining a Material Model
• Conventions

Overview

Matmodlab calls user defined materials at each deformation increment through all analysis steps. User defined materials are

• written in fortran or python
• called from python

Material Model API

Two API’s are provided for interfacing user developed materials with Matmodlab:

• Python API. Material models are implemented as subclasses of MaterialModel,
• Fortran API. Similar to commercial finite element codes, material models are implemented in Fortran subroutines that are compiled, linked, and called by Matmodlab.

Auxiliary Subroutines

Fortran subroutines can set initial conditions and interact with Matmodlab as described in the following sections:

• User Defined Initial Conditions
• Writing Messages to the Console and/or Log File