Particle Bodies in an Explicit Dynamics analysis can be activated or deactivated at different load steps using Element Birth and Death objects. This is not available for LS-DYNA analyses.

For information on how to setup and use an Element Birth and Death object, see the section Boundary Condition Application in Element Birth and Death in the Mechanical User's Guide.

Element Birth and Death objects in an Explicit Dynamics analysis may only be scoped to bodies with Reference Frame of type Particle. They must be scoped to the entire body and not a subset of mesh nodes of the body. You can have multiple Element Birth and Death objects scoped to different Particle bodies.

An Element Birth and Death object may be used to activate and deactivate its associated Particle bodies once in the analysis. Particle bodies cannot be reactivated. If you set a Particle body to reactivate, an error will be generated during the solution.