Title: A single asperity elastic-plastic contact model with the effect of kinematic strain hardening

Authors: T.R. Chinnusamy; A. Sivakumar; V.L. Raja; Ambujam Kathan

Addresses: Department of Mechanical Engineering, Sengunthar Engineering College, Tiruchengode, 637205, India ' Department of Safety and Fire Engineering, Excel Engineering College, Komarapalayam, Namakkal District, India ' Department of Mechanical Engineering, Loyola Institute of Technology, Chennai, India ' Department of Electronics and Communication Engineering, Sri Bharathi Engineering College for Women, Kaikurichi, Pudukkottai, 622303, India

Abstract: Explaining the contact interaction of rough surfaces through spherical asperity contact model is an effective one. In the current work, a single asperity deforming against a flat surface is modelled and investigated through finite element approach. The combined impact of elastic modulus, yield strength, Poisson's ratio and bilinear kinematic strain hardening rate on contact parameters is studied. The results revealed that the kinematic strain hardening rate significantly affects the contact load, contact area and contact pressure in elastic-plastic and fully plastic deformation states. Due to the increase in kinematic strain hardening rate, the impact of Poisson's ratio on contact parameters increases at high interference ratios in high strength materials. While increasing the kinematic strain hardening rate, high load carrying capacity can be achievable in low strength materials at elastic-plastic and fully plastic contact states. The empirical expressions are established to compute contact parameters with function of Poisson's ratio, elastic modulus to yield strength ratio and interference ratio.

Keywords: single asperity; elastic-plastic contact; material property; finite element approach; contact parameters; kinematic strain hardening.

DOI: 10.1504/IJSURFSE.2024.138507

International Journal of Surface Science and Engineering, 2024 Vol.18 No.2, pp.149 - 171

Received: 16 Aug 2023
Accepted: 29 Oct 2023
Published online: 08 May 2024 *

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