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Thermodynamics of crack healing under electropulsing

Published online by Cambridge University Press:  31 January 2011

Rongshan Qin  and
Shengxia Su
Rongshan Qin
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom
Shengxia Su
Affiliation:
Department of Mathematics and Computer Science, Shanxi Normal University, Linfen 041004, People's Republic of China
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Abstract

The effect of electropulsing on the evolution of an elliptical cylinder microcrack was studied from a thermodynamic point of view. An analytical expression for the healing driving force with respect to the passing electric current density, crack geometric shape, Young's modulus, and sample size was derived. The critical current density for crack healing was calculated and agreed with the experimental results very well. The heterogeneous temperature rise due to Joule heat was calculated and proved ideal to the crack healing. Earlier experimental results can be fully understood within the present theoretical frame.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 2048 - 2052
Copyright
Copyright © Materials Research Society 2002

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