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Effect of Dilatation on the Elasto-Plastic Response of Bulk Metallic Glasses Under Indentation

Prasad, Anamika and Dao, Ming and Ramamurty, Upadrasta (2009) Effect of Dilatation on the Elasto-Plastic Response of Bulk Metallic Glasses Under Indentation. In: MRS Proceedings, 1224 .

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Abstract

Elasto-plastic response of bulk metallic glasses (BMGs) follows closely the response of granular materials through pressure dependent (or normal stress) yield locus and shear stress induced material dilatation. On a micro-structural level, material dilatation is responsible for stress softening and formation of localized shear band, however its influence on the macro-scale flow and deformation is largely unknown. In this work, we systematically analyze the effect of material dilatation on the gross indentation response of Zr-based BMG via finite element simulation. The strengthening/softening effect on the load-depth response and corresponding stress-strain profiles are presented in light of differences in elastic-plastic regimes under common indenters. Through comparison with existing experimental results, we draw conclusions regarding selection of suitable dilatation parameters for accurately predicting the gross response of BMGs

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Cambridge University Press.
Keywords: Amorphous;nano-indentation;stress/strain relationship
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Ms TV Yashodha
Date Deposited: 17 Aug 2011 06:49
Last Modified: 17 Aug 2011 06:49
URI: http://eprints.iisc.ac.in/id/eprint/39938

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