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Fracture mechanics analysis of asperity cracking due to adhesive normal contact

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Abstract

A two-dimensional linear-elastic fracture mechanics analysis of asperity cracking induced by adhesive normal contact was performed with the finite element method. Normal contact between two elastic asperities was analyzed with the equivalent contact system of an elastic asperity with equivalent radius of curvature and effective elastic modulus compressed by a rigid plane. Surface adhesion was modeled by nonlinear springs obeying a constitutive force-distance law derived from the Lennard–Jones potential. The maximum ranges of the tensile and shear stress intensity factors were used to determine the crack-growth direction and the dominant mode of asperity fracture in terms of the Maugis parameter (a function of the equivalent radius of curvature, work of adhesion, effective elastic modulus, and intermolecular equilibrium distance), friction coefficient at the crack interface, maximum surface interference, and crack position. Finite element simulation results indicate that the direction and the rate of crack growth are mostly affected by the Maugis parameter and the maximum surface interference. A transition from shear to tensile dominant mode of crack growth is encountered with the increase of the Maugis parameter and/or the decrease of the maximum surface interference. Opening, slip, and stick between the crack faces during loading and unloading are discussed in the context of crack mechanism maps.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of California, Berkeley, CA, 94720, USA

    H. Xu & K. Komvopoulos

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  1. H. Xu
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  2. K. Komvopoulos
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Correspondence to K. Komvopoulos.

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Xu, H., Komvopoulos, K. Fracture mechanics analysis of asperity cracking due to adhesive normal contact. Int J Fract 181, 273–283 (2013). https://doi.org/10.1007/s10704-013-9849-9

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  • DOI: https://doi.org/10.1007/s10704-013-9849-9

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