Effect of Poisson's ratio on crack tip fields and fracture behavior of metallic glasses

Tandaiya, Parag and Ramamurty, U and Ravichandran, G and Narasimhan, R (2008) Effect of Poisson's ratio on crack tip fields and fracture behavior of metallic glasses. In: Acta Materialia, 56 (20). pp. 6077-6086.

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Abstract

A Study of the effect of Poisson's ratio on the stationary mode I crack tip fields in amorphous alloys is conducted. Finite element simulations under plane strain, small scale yielding conditions are performed with it Mohr-Coulomb based constitutive model that accounts for pressure sensitivity of plastic flow as well its the localization of plastic strain into discrete shear hands. Simulations are also performed with von Mises and Drucker-Prager constitutive models. While the Poisson's ratio does not alter the crack tip fields significantly when the material obeys these two models, it has I marked influence in the Mohr-Coulomb) case with softening. A higher Poisson's ratio reduced the extent of plastic zone and plastic strain levels in front. of the notch tip as well as that within the simulated shear bands around the notch root at it given level of stress intensity factor. The implications of these observations on toughness of metallic glasses are discussed.

Item Type:	Journal Article
Publication:	Acta Materialia
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Metallic glasses;Toughness;Poisson's ratio;Finite element analysis;Shear bands.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	30 Apr 2009 05:22
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17859

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