A Numerical Model for Elastoplastic Rough Contact
P. Sainsot,; C. Jacq,; and D. N ' e lias

Source CMES: Computer Modeling in Engineering & Sciences, Vol. 3, No. 4, pp. 497-506, 2002
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Keywords Contact, plasticity, FFT, boundary integral
Abstract Pressure distributions calculated in the simulation of rough contacts show high values and induce high stresses just beneath the surface. These stresses often exceed the yield strength of the material, therefore, a purely elastic contact model is restrictive. Plastic flow occurs and modifies the surface shape and consequently modifies the surface pressure. \\ \\ This paper presents a numerical model for 3D-elastoplastic rough contact. It allows the determination of real pressure and permanent surface displacement (flattening of asperities) as well as residual stresses and plastic strains useful in fatigue analysis. The material is assumed to follow the Von-Mises yield criterion with isotropic hardening. \\ \\ The use of FFT in the numerical procedure allows a large number of meshing points so real surfaces obtained from a measurement can be considered.
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