Elastic-plastic adhesive contact of non-Gaussian rough surfaces |
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Authors: | Prasanta Sahoo S Mohamed Ali |
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Affiliation: | (1) Department of Mechanical Engineering, Jadavpur University, Kolkata, 700 032, India;(2) Department of Mechanical Engineering, Pondicherry Engineering College, Pondicherry, 605 014, India |
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Abstract: | The paper describes an analysis of adhesion at the contact between non-Gaussian rough surfaces using the Weibull distribution
with skewness as the key parameter to characterize asymmetry. The analysis uses an improved elastic-plastic model of contact
deformation that is based on accurate Finite Element Analysis (FEA) of an elastic-plastic single asperity contact. Large range
of interference values is considered starting from fully elastic through elastic-plastic to fully plastic regime 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 the
adhesion indices and skewness values are obtained as functions of mean separation between the surfaces. Transitional values
of adhesion indices and skewness at which the influence of surface forces becomes insignificant are found to depend on material
and surface parameters. Comparison with studies using previous elastic-plastic model that was based on some arbitrary assumptions
shows significant differences in loading behaviour. |
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Keywords: | Adhesion asymmetric roughness elastic-plastic contact non-Gaussian rough surfaces |
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