Evidence for Bingham plastic boundary layers in shear banding of metals

Sagapuram, Dinakar and Viswanathan, Koushik (2018) Evidence for Bingham plastic boundary layers in shear banding of metals. In: EXTREME MECHANICS LETTERS, 25 . pp. 27-36.

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Abstract

We study material flow in the vicinity of single shear bands in high strain-rate (10(4) -10(5) per second) deformation of metals. Shear band plastic flow, in three different materials, is shown to resemble unsteady planar Couette flow (Stokes first problem) of a Bingham fluid. Equivalent shear band viscosities and yield stresses are obtained, with the former similar to liquid metal viscosities and the latter being similar to 0.5 times the band nucleation stress. Reynolds and Bingham numbers, computed based on the shear band displacement measurements, are suggestive of boundary layer formation, consistent with the severe localization of deformation within shear bands. (C) 2018 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	EXTREME MECHANICS LETTERS
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	copyright for this article belongs to ELSEVIER SCIENCE BV
Keywords:	Shear bands; Plasticity; Viscosity; Boundary layers; Metals
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	24 Jan 2019 09:59
Last Modified:	24 Jan 2019 09:59
URI:	http://eprints.iisc.ac.in/id/eprint/61400

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