Rigid materials can be modeled in an explicit dynamics system by selecting geometry, "Stiffness behavior = rigid" on a body. In such cases only the density property of the material associated with the body will be used.

For explicit dynamics systems all rigid bodies must be discretized with a full mesh. This will be specified by default for the explicit meshing physics preference.

The mass and inertia of the rigid body will be derived from the elements and material density for each body.

By default, a kinematic rigid body is defined in explicit dynamics and its motion will depend on the resultant forces and moments applied to it through interaction with other parts of the model. Elements filled with rigid materials can interact with other regions via contact.

Constraints can only be applied to an entire rigid body. For example, a fixed displacement cannot be applied to one edge of a rigid body; it must be applied to the whole body.