An improved elastic-plastic contact model of rough surfaces in the presence of adhesion

Abstract

The paper describes a theoretical study of adhesion at the contact between rough surfaces with small-scale surface asperities using an elastic-plastic model of contact deformation that is based on accurate finite element analysis (FEA) of an elastic-plastic single asperity contact. The model considers a large range of interference values from fully elastic through elastic-plastic to fully plastic regimes of contacting asperities. The well-established elastic and plastic adhesion indices are used to consider the different conditions that arise as a result of varying load and material parameters. The loading and unloading behaviour for different combinations of these adhesion indices are obtained as functions of mean separation between the surfaces. Comparison with a previous elastic-plastic model that was based on some arbitrary assumptions is made, showing significant differences.

Keywords

adhesion roughness elastic-plastic contact

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