Mixed mode (I and II) crack tip fields in bulk metallic glasses

Tandaiya, P and Ramamurty, U and Narasimhan, R (2009) Mixed mode (I and II) crack tip fields in bulk metallic glasses. In: Journal of the Mechanics and Physics of Solids, 57 (11). pp. 1880-1897.

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Abstract

Stationary crack tip fields in bulk metallic glasses under mixed mode (I and II) loading are studied through detailed finite element simulations assuming plane strain, small scale yielding conditions. The influence of internal friction or pressure sensitivity on the plastic zones, notch deformation, stress and plastic strain fields is examined for different mode mixities. Under mixed mode loading, the notch deforms into a shape such that one part of its surface sharpens while the other part blunts. Increase in mode II component of loading dramatically enhances the normalized plastic zone size, lowers the stresses but significantly elevates the plastic strain levels near the notch tip. Higher internal friction reduces the peak tangential stress but increases the plastic strain and stretching near the blunted part of the notch. The simulated shear bands are straight and extend over a long distance ahead of the notch tip under mode II dominant loading. The possible variations of fracture toughness with mode mixity corresponding to failure by brittle micro-cracking and ductile shear banding are predicted employing two simple fracture criteria. The salient results from finite element simulations are validated by comparison with those from mixed mode (I and II) fracture experiments on a Zr-based bulk metallic glass.

Item Type:	Journal Article
Publication:	Journal of the Mechanics and Physics of Solids
Publisher:	Elsevier B.V.
Additional Information:	The copyright of this article belongs to the Elsevier B.V.
Keywords:	Bulk metallic glass; Crack tip fields; Crack tip plasticity; Different modes; Ductile shear; Finite element simulations; Finite elements; Fracture criteria; Glass material; Long distances; Mixed mode; Mixed mode (I and II); Mixed-Mode Loading; Mode II; Mode mixity; Plane strains; Plastic strain; Plastic strain fields; Plastic zone size; Plastic zones; Pressure sensitivities; Small-scale yielding; Stationary crack; Tangential stress; Zr based bulk metallic glass, Brittle fracture; Crack tips; Ductile fracture; Elastic waves; Fatigue crack propagation; Finite element method; Fracture toughness; Glass; Internal friction; Plastic deformation; Plasticity; Plastics; Zirconium, Metallic glass
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	18 Jul 2022 05:20
Last Modified:	18 Jul 2022 05:20
URI:	https://eprints.iisc.ac.in/id/eprint/74972

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