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Numerical study of stationary cracks in bulk metallic glass composites under Mode I, small scale yielding conditions

Dutta, T and Narasimhan, R (2020) Numerical study of stationary cracks in bulk metallic glass composites under Mode I, small scale yielding conditions. In: Engineering Fracture Mechanics, 239 .

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Official URL: https://dx.doi.org/10.1016/j.engfracmech.2020.1073...


In this study, finite element analyses of Mode I loading of stationary cracks in in-situ bulk metallic glass composites (BMGCs) are performed under plane strain, small scale yielding (SSY) conditions. In the first part of this work, a thermodynamically consistent finite strain constitutive theory for BMGCs is employed to represent the entire domain. In this homogenized model, the soft crystalline dendrites are considered to obey J2 flow theory of plasticity with isotropic power law hardening, while the bulk metallic glass (BMG) matrix is taken to follow a free-volume based constitutive model. The effects of volume fraction Vf and hardening of the crystalline dendrites on the macroscopic stress and plastic strain fields are systematically studied. The predicted trend of the fracture toughness versus Vf corroborates well with experiments. In the second part, multi-scale SSY analyses are performed, with discrete soft dendrites in the BMG matrix close to notch tip explicitly simulated, while the surrounding region is represented by the homogenized BMGC model. It is found that low strength and/or low hardening dendrites with high Vf dissipate more plastic work in the neighborhood of the notch tip, thereby shielding the relatively brittle BMG matrix. © 2020 Elsevier Ltd

Item Type: Journal Article
Publication: Engineering Fracture Mechanics
Publisher: Elsevier Ltd
Additional Information: The copyright of this article belongs to Elsevier Ltd
Keywords: Composite materials; Cracks; Fracture toughness; Glass; Hardening; Strain, Bulk metallic glass; Bulk metallic glass composites; Constitutive theory; Homogenized model; Macroscopic stress; Plastic strain fields; Small-scale yielding; Surrounding regions, Metallic glass
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 17 Nov 2020 09:19
Last Modified: 17 Nov 2020 09:19
URI: http://eprints.iisc.ac.in/id/eprint/66666

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