Modelling and Simulation in Engineering (Jan 2011)

A Finite Element-Based Elastic-Plastic Model for the Contact of Rough Surfaces

  • Ali Sepehri,
  • Kambiz Farhang

DOI
https://doi.org/10.1155/2011/561828
Journal volume & issue
Vol. 2011

Abstract

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Three-dimensional elastic-plastic contact of two nominally flat rough surfaces is considered. Equations governing the shoulder-shoulder contact of asperities are derived based on the asperity constitutive relations from a finite element model of the elastic-plastic interaction proposed by Kogut and Etsion (2002), in which asperity scale constitutive relations are derived using piecewise approximate functions. An analytical fusion technique is developed to combine the piecewise asperity level constitutive relations. Shoulder-shoulder asperity contact yields a slanted contact force consisting of two components, one in the normal direction and a half-plane tangential component. Statistical summation of the asperity level contact force components and asperity level contact area results in the total contact force and total contact area formulae between two rough surfaces. Approximate equations are developed in closed form for contact force components and contact area.