Hyper-Reduction Approaches for Contact Modeling with Small Tangential Displacements: Applications for a Bolted Joint

The current paper presents a study of two approaches for the hyper-reduction of contact interfaces for non-linear structural dynamics analyses. The first approach is a reformation of the “whole-joint approach” wherein different regions of the contact interface are grouped together using a “non-linear patch”; and the second approach is based on a selective remeshing of the interface. Both are conducted based on some field objectives such as contact traction, etc. A recently developed quasi-static modal analysis technique is applied to characterize the systems in terms of amplitude-dependent modal properties, which are compared as a qualification metric.