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On the Strain and Strain-Rate Dependence of Plastic Work Converted to Heat: An Experimental Study Using High Speed Infrared Detectors and the Kolsky Bar

Mason, J. J. and Rosakis, A. J. and Ravichandran, G. (1994) On the Strain and Strain-Rate Dependence of Plastic Work Converted to Heat: An Experimental Study Using High Speed Infrared Detectors and the Kolsky Bar. Mechanics of Materials, 17 (2-3). pp. 135-145. ISSN 0167-6636 . http://resolver.caltech.edu/CaltechAUTHORS:20150225-162749467

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Abstract

The conversion of plastic work to heat at high strain rates gives rise to a significant temperature increase which contributes to thermal softening in the constitutive response of many materials. This investigation systematically examines the rate of conversion of plastic work to heat in metals using a Kolsky (split Hopkinson) pressure bar and a high-speed infrared detector array. Several experiments are performed, and the work rate to heat rate conversion fraction, the relative rate at which plastic work is converted to heat, is reported for 4340 steel, 2024 aluminum and Ti-6A1-4V titanium alloys undergoing high strain and high strain rate deformation. The functional dependence of this quantity upon strain and strain rate is also reported for these metals. This quantity represents the strength of the coupling term between temperature and mechanical fields in thermomechanical problems involving plastic flow. The experimental measurement of this constitutive function is important since it is an integral part of the formulation of coupled thermomechanical field equations, and it plays an important role in failure mode selection — such as the formation of adiabatic shear bands — in metals deforming at high strain rates.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0167-6636(94)90054-X DOIArticle
http://www.sciencedirect.com/science/article/pii/016766369490054XPublisherArticle
Additional Information:© 1994 Elsevier Science B.V. Received 6 November 1992; revised version received 25 March 1993. The research of A.J. Rosakis and J.J. Mason is performed with support from the Office of Naval Research under grant N00014-90-J-1340, and the research of G. Raviehandran is performed with support from the National Science Foundation under a Presidential Young Investigator award.
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Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-90-J-1340
NSF Presidential Young Investigator AwardUNSPECIFIED
Record Number:CaltechAUTHORS:20150225-162749467
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150225-162749467
Official Citation:J.J. Mason, A.J. Rosakis, G. Ravichandran, On the strain and strain rate dependence of the fraction of plastic work converted to heat: an experimental study using high speed infrared detectors and the Kolsky bar, Mechanics of Materials, Volume 17, Issues 2–3, March 1994, Pages 135-145, ISSN 0167-6636, http://dx.doi.org/10.1016/0167-6636(94)90054-X. (http://www.sciencedirect.com/science/article/pii/016766369490054X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55227
Collection:CaltechAUTHORS
Deposited By: Cheryl Gause
Deposited On:02 Mar 2015 23:42
Last Modified:29 Sep 2016 23:39

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