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On a thermo-mechanical effect and criterion of crack propagation

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Abstract

A thermo-mechanical effect from partial conversion of fracture work into heat energy during crack propagation is considered with a simple mathematical model. It is assumed that the heat production zone in the vicinity of the crack tip is very small. Thus, the crack propagation process can be viewed as propagation of the crack in elastic material with a point thermal heat source fixed at the tip of the crack. This thermal heat source generates its own temperature and stress fields around the crack tip. As shown in this paper it also generates a negative stress intensity factor that specifies fracture mode I and has to be accounted for in the energetic fracture criterion. The model developed may help to explain many experimental observations such as the increase in the specific surface energy that accompanies an increase in the crack speed and why fracture mode I has a special role in crack propagation phenomena.

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  1. Department of Mechanical Engineering, Monash University, Clayton, Victoria, 3800, Australia

    A.G. Kotousov

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Kotousov, A. On a thermo-mechanical effect and criterion of crack propagation. International Journal of Fracture 114, 349–358 (2002). https://doi.org/10.1023/A:1015769513968

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