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Relationship between contact size and static friction:An approach for rigid crystalline surfaces

Friction 2021年第3期9卷 502-512页

作者： Hao CHEN Xinlei GAO School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China

Relationship between contact size(A)and static friction(f)has been studied for rigid crystalline *** built a series of systems with two identical surfaces but different orientations and investigated the effects of the size and shape of the contact area on static *** these systems,there are numerous nontrivial commensurate *** results confirmed that the relationship between A and f was determined by both commensurability and shape of the *** commensurate contacts,f∝A independent of the *** incommensurate contacts,generally f∝A^(0) for regular shapes or f∝A^(1/4) for irregular shapes;however,in very few cases of regular shapes,f∝A^(1/2).Moreover,in above systems,commensurability of a contact can be easily changed by a perturbation of the misfit ***,if the perturbation caused by the lateral force and the deformation of the surface are considered(as is the case in real systems),further research is necessary.

关键词： static friction contact size numeric simulation rigid body

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A mechanical model for the adhesive contact with local sliding induced by a tangential force

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Acta Mechanica Solida Sinica 2017年第4期30卷 369-373页

作者： Gan-Yun Huang Ji-Feng Yan Department of Mechanics School of Mechanical EngineeringTianjin University

Adhesion has been demonstrated to play an important role in contact and friction between objects at small scales. While various models have been established for adhesive contact under normal forces, studies on the adhesive contact under tangential force have been far fewer, which if any, are mostly confined to the non-slipping situations. In the present work, a model has been proposed for adhesive contact with local sliding under tangential forces. Herein, the onset of local sliding in adhesive contact has been addressed by assuming the nucleation of dislocations. By analogy with the emission of dislocations at a crack tip, the critical tangential force for the onset of sliding has been determined, and its effect on the evolution of contact size has also been studied. Comparison with relevant experiments has verified the validity of the present model.

关键词： Adhesive contact Tangential force Local sliding Dislocation contact size

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