Adhesive Elastic Contact of Rough Surfaces with Power-Law Axisymmetric Asperities

Author:

Wang Lefeng1,Rong Weibin2,Shao Bing2,Sun Lining2

Affiliation:

1. Key Laboratory of Micro-Systems and Micro-structures Manufacturing,Ministry of Education,Harbin Institute of Technology, Harbin, 150001, P. R. C.

2. State Key Laboratory of Robotics and System,Harbin Institute of Technology, Harbin, 150001, P. R. C.

Abstract

The contact model for rough surfaces with power-law axisymmetric asperities in the presence of adhesion is developed. The extended JKR adhesive contact model for power-law axisymmetric asperities, denoted as JKR-n, developed by Zheng and Yu (2007,“Using the Dugdale Approximation to Match a Specific Interaction in the Adhesive Contact of Elastic Objects,” J. Colloid Interface Sci., 310, pp. 27–34) is utilized to investigate the adhesive contact of rough surfaces. The JKR-n adhesive contact model generalizes the most adopted JKR model for spherical objects of n = 2. This work compares the effect of surface roughness on the adhesion force for rough surfaces with various power-law axisymmetric asperities. It is found that shapes of the asperities influence the pull-off forces greatly during the separation of rough surfaces. A general adhesion parameter that includes the shape index of asperities is proposed, and it can be used to characterize the adhesion performance of rough surfaces.

Publisher

ASME International

Subject

Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials

Reference25 articles.

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