Two-Dimensional Finite Element Analysis of Elastic- Plastic Deformation in Asperity-Asperity Collision S. Kang 1 A. Almqvist 1 R. Larsson 1 1 Luleå University of Technology, 971 87 Luleå, Sweden Corresponding author (E-mail:[email protected]) Abstract The collision of cylindrical asperities is simulated by means of a commercial multiphysics software in this paper. The model combines a computational structure mechanics approach with a contact algorithm. Numerical results are first compared to classical Hertzian theory. Effects of the bulk material under the mating surfaces have been included in the simulation. Materials of top and bottom surfaces have been assigned different properties. Development of plastic deformation and friction are presented along the process of collision. Strain hardening is included in the elastic- plastic deformation. The effect of interference change and friction coefficient variation on deformation and friction has been studied. Deformed shape and subsurface residual stress in asperity are output parameters from this study. Keyword: Asperity, elastic-plastic, friction Notation Interference [m] Adhesive friction coefficient 1 R Radius for top asperity [m] 2 R Radius for bottom asperity [m] ' R Effective radius [m] 1 Poisson ratio for top asperity 2 Poisson ratio for bottom asperity 1 E Modulus of elasticity for top asperity [Pa] 2 E Modulus of elasticity for bottom asperity [Pa] ' E Effective module of elasticity [Pa] n F Load per unit length [N/m] a Semi contact length [m] P Contact pressure [Pa] y Yield stress [Pa] eff Effective strain ep Effective plastic strain 1 h E Hardening modulus for top asperity [Pa] 2 h E Hardening modulus for bottom asperity [Pa] hard Hardening function [Pa] exp Function of effective stress [Pa] Global friction force [N/m] f
Two-Dimensional Finite Element Analysis of ElasticPlastic Deformation in Asperity-Asperity Collision
Jun 23, 2023
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