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Role of indenter angle on the plastic deformation underneath a sharp indenter and on representative strains: An experimental and numerical study

Prasad, Eswar K and Chollacoop, N and Ramamurty, U (2011) Role of indenter angle on the plastic deformation underneath a sharp indenter and on representative strains: An experimental and numerical study. In: Acta Materialia, 59 (11). pp. 4343-4355.

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Official URL: http://dx.doi.org/10.1016/j.actamat.2011.03.058

Abstract

The subsurface microhardness mapping technique of Chaudhri was utilized to determine the shape, size and distribution of plastic strain underneath conical indenters of varying semi-apex angles, alpha (55 degrees, 65 degrees and 75 degrees). Results show that the elastic-plastic boundary under the indenters is elliptical in nature, contradicting the expanding cavity model, and the ellipticity increases with alpha. The maximum plastic strain immediately under the indenter was found to decrease with increasing alpha. Complementary finite-element analysis was conducted to examine the ability of simulations to capture the experimental observations. A comparison of computational and experimental results indicates that the plastic strain distributions as well as the maximum strains immediately beneath the indenter do not match, suggesting that simulation of sharp indentation requires further detailed studies for complete comprehension. Representative strains, epsilon(r), evaluated as the volume-average strains within the elastic-plastic boundary, decrease with increasing alpha and are in agreement with those estimated by using the dimensional analysis. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Hardness;Finite-element analysis;Microindentation;Plastic deformation;Representative strain
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 29 Jun 2011 10:00
Last Modified: 29 Jun 2011 10:00
URI: http://eprints.iisc.ernet.in/id/eprint/38647

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