Energy Loss in the Impact of Elastic Spheres on a Rigid Half-Space in Presence of Adhesion

Jayadeep, UB and Bobji, MS and Jog, CS (2014) Energy Loss in the Impact of Elastic Spheres on a Rigid Half-Space in Presence of Adhesion. In: TRIBOLOGY LETTERS, 53 (1). pp. 79-89.

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Abstract

Adhesion can cause energy losses in asperities or particles coming into dynamic contact resulting in frictional dissipation, even if the deformation occurring is purely elastic. Such losses are of special significance in impact of nanoparticles and friction between surfaces under low contact pressure to hardness ratio. The objective of this work is to study the effect of adhesion during the normal impact of elastic spheres on a rigid half-space, with an emphasis on understanding the mechanism of energy loss. We use finite element method for modeling the impact phenomenon, with the adhesion due to van der Waals force and the short-range repulsion included as body forces distributed over the volume of the sphere. This approach, in contrast with commonly used surface force approximation, helps to model the interactions in a more precise way. We find that the energy loss in impact of elastic spheres is negligible unless there are adhesion-induced instabilities. Significant energy loss through elastic stress waves occurs due to jump-to-contact and jump-out-of-contact instabilities and can even result in capture of the elastic sphere on the half-space.

Item Type:	Journal Article
Publication:	TRIBOLOGY LETTERS
Publisher:	SPRINGER/PLENUM PUBLISHERS
Additional Information:	Copyright for this article belongs to the SPRINGER/PLENUM PUBLISHERS, USA
Keywords:	Adhesion; Coefficient of restitution; Finite element method; Elastic stress waves; Nanotribology
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	07 Feb 2014 06:47
Last Modified:	07 Feb 2014 06:47
URI:	http://eprints.iisc.ac.in/id/eprint/48322

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