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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. Acta Materialia, 56 (20). pp. 6077-6086. ISSN 1359-6454. doi:10.1016/j.actamat.2008.08.018.

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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 a Mohr–Coulomb based constitutive model that accounts for pressure sensitivity of plastic flow as well as the localization of plastic strain into discrete shear bands. 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 a marked influence in the Mohr–Coulomb case with softening. A higher Poisson’s ratio reduces 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 a given level of stress intensity factor. The implications of these observations on toughness of metallic glasses are discussed.

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Ravichandran, G.0000-0002-2912-0001
Additional Information:Copyright © 2008 Acta Materialia Inc. Received 1 May 2008; revised 10 August 2008; accepted 10 August 2008. Available online 11 September 2008.
Subject Keywords:Metallic glasses; Toughness; Poisson’s ratio; Finite element analysis; Shear bands
Issue or Number:20
Record Number:CaltechAUTHORS:TANam08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12877
Deposited By: Archive Administrator
Deposited On:06 Jan 2009 00:10
Last Modified:08 Nov 2021 22:33

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