Plastic deformation of rough surfaces |
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Authors: | Kai Willner Franz Hauer |
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Institution: | University of Erlangen-Nuremberg, Chair of Applied Mechanics, Egerlandstr. 5, 91058 Erlangen |
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Abstract: | Friction forces are only transferred within the the real area of contact Areal, which is usually smaller than the apparent area of contact Ao. The maximum friction stress τfric is therefore determined by the shear limit τmax in the area of real contact and the fraction of the real area of contact (τfric = τmax (Areal/Ao)). For rough surfaces the size of Areal is governed o by the plastic deformation of the surface roughness. We present a fully elasto-plastic halfspace contact formulation based on the work of Jacq et al. 1]. Linear elastic-plastic material behavior is modeled based on v. Mises plasticity with isotropic hardening. The algorithm gives the residual stress as well as the full plastic deformation field due to a frictionless normal contact. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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