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The Conversion of Plastic Work to Heat around a Dynamically Propagating Crack in Metals

Rosakis, A. J. and Mason, J. J. and Ravichandran, G. (1992) The Conversion of Plastic Work to Heat around a Dynamically Propagating Crack in Metals. California Institute of Technology , Pasadena, CA. http://resolver.caltech.edu/CaltechAUTHORS:20150309-093637326

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Abstract

Investigations of the temperature rise at a dynamically propagating crack tip using an infrared detector array are reported. Also, a measurement of the fraction of plastic work converted to heat using a split hopkinson bar apparatus in conjunction with an infrared detector array is summarized. For 4340 steel it is seen that ≈85% of the plastic work is converted to heat leading to a temperature rise of 300°C at a crack tip propagating 600 m/s in steel. This results is compared to earlier studies that report a 450°C temperature rise at a crack tip propagating 900 m/s in steel. In a titanium alloy the temperature rise is higher than that in steel for equal plastic work rate densities. The conditions at the crack tip are shown to be adiabatic, and, as a result, this effect is due to the difference in density, heat capacity and crack tip speed. Thermal conductivity has no effect.


Item Type:Report or Paper (Technical Report)
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http://resolver.caltech.edu/CaltechAUTHORS:20150225-160634772 Related ItemPublished Version
Additional Information:We are grateful to Office of Naval Research for support under grant N00014-90-J-1340 and to A.T. Zehnder for sharing the raw data from his investigation. The computations described here were carried out on a Cray Y-MP at the San Diego Supercomputing Center (SDSC).
Group:Graduate Aeronautical Laboratories (Solid Mechanics), GALCIT
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Office of Naval Research (ONR)N00014-90-J-1340
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GALCITSM 92-17
Record Number:CaltechAUTHORS:20150309-093637326
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150309-093637326
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ID Code:55628
Collection:CaltechGALCITSM
Deposited By: Tony Diaz
Deposited On:09 Mar 2015 22:13
Last Modified:29 Sep 2016 23:40

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