DYNAMICS OF A STATE-VARIABLE FRICTIONAL LAW IN FINITE-ELEMENT ANALYSIS

This paper discusses a state- and rate-dependent frictional model and its implementation in large deformation finite elements. The model fea tures a state variable to describe fading memory of slip history and a Perzyna viscoplastic regularization to quantify the frictional respon se to rapid slip changes. Some results in nonlinear dynamics for a sim ple spring mass frictional slider are very briefly presented as backgr ound for some frictional induced instabilities in finite elements that are discussed next. Comparison with available experimental data is pe rformed and an overall good agreement is observed where a simple Coulo mb law failed to predict reasonable results.