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Continuity of plastic strain rate in stress relaxation tests

Ray, SK and Sasikala, G and Rodriguez, P and Sastry, DH (1993) Continuity of plastic strain rate in stress relaxation tests. In: Materials Science and Technology, 9 (12). pp. 1079-1085.

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Official URL: http://www.ingentaconnect.com/content/maney/mst/19...

Abstract

Stress relaxation testing is often utilised for determining whether athermal straining contributes to plastic flow; if plastic strain rate is continuous across the transition from tension to relaxation then plastic strain is fully thermally activated. This method was applied to an aged type 316 stainless steel tested in the temperature range 973–1123 K and to a high purity Al in the recrystallised annealed condition tested in the temperature range 274–417 K. The results indicated that plastic strain is thermally activated in these materials at these corresponding test temperatures. For Al, because of its high strain rate sensitivity, it was necessary to adopt a back extrapolation procedure to correct for the finite period that the crosshead requires to decelerate from the constant speed during tension to a dead stop for stress relaxation.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Materials, Minerals and Mining.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 03 Feb 2011 06:27
Last Modified: 03 Feb 2011 06:27
URI: http://eprints.iisc.ernet.in/id/eprint/35379

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