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Assessing formability of sheet metals through advanced tensile and LASER speckle analysis

Shabadi, Rajashekhar and Roven, Hans Jørgen and Kumar, Surendra and Dwarakadasa, ES (2002) Assessing formability of sheet metals through advanced tensile and LASER speckle analysis. In: Materials Science Forum, 396-4 . pp. 1623-1628.

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Official URL: http://www.scientific.net/MSF.396-402.1623


The ability of a metal to resist strain localisation and hence reduction in local thickness, is a most important forming property upon stretching. The uniform strain represents in this regard a critical factor to describe stretching ability - especially when the material under consideration exhibits negative strain rate sensitivity and dynamic strain ageing (DSA). A newly developed Laser Speckle Technique (LST), e.g. see [1], was used in-situ during tensile testing with two extensometers. The applied technique facilitates quantitative information on the propagating plasticity (i.e. the so-called PLC bands) known to take place during deformation where DSA is active. The band velocity (V-band), and the bandwidth (W-band) were monitored upon increasing accumulated strain. The knowledge obtained with the LST was useful for understanding the underlying mechanisms for the formability limit when DSA and negative strain rate sensitivity operate. The goal was to understand the relationship between PLC/DSA phenomena and the formability limit physically manifested as shear band formation. Two principally different alloys were used to discover alloying effects.

Item Type: Editorials/Short Communications
Publication: Materials Science Forum
Publisher: Trans Tech Publications Inc..
Additional Information: Copyright of this article belongs to Trans Tech Publications Inc..
Keywords: Aluminium Alloys Laser Speckle Technique;Portevin-Le Châtelier Effect;Serrated Flow;Sheet Metal Formability
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 04 Aug 2011 05:20
Last Modified: 17 Oct 2018 09:25
URI: http://eprints.iisc.ac.in/id/eprint/39003

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