INTERACTION OF A SLIDING WEDGE AND A METALLIC SPECIMEN WITH A NEAR-SURFACE INHOMOGENEITY

Salilkumar, Vandana A and Sundaram, Narayan K (2018) INTERACTION OF A SLIDING WEDGE AND A METALLIC SPECIMEN WITH A NEAR-SURFACE INHOMOGENEITY. In: 13th International Manufacturing Science and Engineering Conference, June 18–22, 2018, Texas, USA.

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Abstract

The problem of a hard wedge sliding against a metal substrate has been studied extensively for its importance in triboplasticity and deformation processing. Here we explore the effect of introducing a single, near-surface plastic inhomogeneity (termed as a pseudograin) in a metal substrate using Lagrangian finite element (FE) analysis. The pseudograin is allowed to be softer or harder than the surrounding material. The effects of sliding parameters like the size and location of the pseudograin, friction and indenter geometry are also studied. Interestingly, the introduction of the pseudograin can lead to production of surface folds / self-contacts, and acutely-inclined, near-surface, crack like features, which cannot be reproduced by homogeneous specimens. In fact, this tribosystem is phenomenologically very rich, despite differing from classical triboplastic systems of Challen, Oxley and Torrance only by way of the inhomogeneity. Despite its simplicity, the model replicates several experimentally observed features of surface folding, and is a minimal model to obtain folding in sliding. The occurrence of surface folds and concomitant residual surface damage points to the important role played by microstructure-related inhomogeneities in determining surface quality in deformation processing operations (e.g. repeated sliding to generate UFG surfaces) and is also a potentially new mode of sliding wear.

Item Type:	Conference Proceedings
Publisher:	AMER SOC MECHANICAL ENGINEERS
Additional Information:	Copyright for this article belongs to the ASME.
Keywords:	Sliding; Wear; Metals; Plasticity
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	28 Dec 2018 08:24
Last Modified:	28 Dec 2018 08:27
URI:	http://eprints.iisc.ac.in/id/eprint/61325

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