Modeling Bolts in LS-DYNA© Using Explicit and Implicit Time Integration

When setting up models for analysis using the explicit solver in LS-DYNA, the method of how to model bolted connections is usually well known. However, when this model or even just certain substructures of the model are used for load cases to be solved using the implicit solver in LS-DYNA, problems might arise that you might have not been aware of before. Typical automotive load cases for LS-DYNA implicit involve roof crush, door sag, misuse and other problems that are running over a long time span.