The multi body dynamics (MBD) theory is a logical choice for the simulation of mechanisms undergoing large displacements. The nonlinearities, either from a kinematic or kinetic point of view, are considered and accounting for the linearized structural flexibility of certain parts is state of the artand available in certain commercial codes. If the behavior of structural parts is influenced by nonlinear effects like contact within joints, new methods are necessary.
The method presented in this paper is based on reduced order modeling of finite element structures. By extending the Craig Bampton mode base with a new type of trial functions, so called joint Interface modes, it is possible to account for the local deformation within the joint area of flexible structures.This enables the efficient computation of contact stresses within the framework of multi body Dynamics and is outlined in the first part of this contribution.
The second part describes the utilization of this method for two examples. The first one is an academic example of a bolted cantilever beam which is investigated in terms of deformation and stresses. The second one is an industrial application, the dynamic simulation of a door slam which is investigated regarding the fatigue performance of the door structure. The comparison with finite element based solutions shows a clear advantage in terms of computational efficiency for the proposed method.