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Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading

Dutta, Tanmay and Chauniyal, Ashish and Singh, I and Narasimhan, R and Thamburaja, P and Ramamurty, U (2018) Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading. In: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, 111 . pp. 393-413.

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Official URL: http://dx.doi.org/10.1016/j.jmps.2017.11.011

Abstract

In this work, numerical simulations using molecular dynamics and non-local plasticity based finite element analysis are carried out on tensile loading of nano-scale double edge notched metallic glass specimens. The effect of acuteness of notches as well as the metallic glass chemical composition or internal material length scale on the plastic deformation response of the specimens are studied. Both MD and FE simulations, in spite of the fundamental differences in their nature, indicate near-identical deformation features. Results show two distinct transitions in the notch tip deformation behavior as the acuity is increased, first from single shear band dominant plastic flow localization to ligament necking, and then to double shear banding in notches that are very sharp. Specimens with moderately blunt notches and composition showing wider shear bands or higher material length scale characterizing the interaction stress associated with flow defects display profuse plastic deformation and failure by ligament necking. These results are rationalized from the role of the interaction stress and development of the notch root plastic zones. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belong to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 02 Mar 2018 14:51
Last Modified: 02 Mar 2018 14:51
URI: http://eprints.iisc.ac.in/id/eprint/59088

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