A PHENOMENOLOGICAL MODEL FOR FRICTIONAL CONTACT ACCOUNTING FOR WEAR EFFECTS

A simple phenomenological model for frictional contact accounting for wear effects is proposed. The objective is the numerical simulation of the frictional behaviour of contacting bodies subjected to large slid ing distances and variable normal pressures. Within the context of the rmodynamics with internal variables, the friction coefficient is assum ed to be a function of the density of frictional work resulting in a t heory analogous to classical work hardening elastoplasticity. The tech nique for experimental identification of the proposed model, applied t o sheet materials, is described and the material parameters for some s teel sheets commonly used in industry are determined. The framework fo r the computer simulation of the model in large scale problems is base d on a fully implicit finite-element scheme and the Newton-Raphson met hod. A robust algorithm based on an operator split method (elastic pre dictor-frictional sliding corrector) is used for numerical integration of the friction constitutive equations. The simulation of a series of sliding tests is carried out and the results are compared with experi ments.