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RESEARCH PAPERS

Thermal Crack Propagation

[+] Author and Article Information
M. K. Kassir

Department of Civil Engineering, The City College of the City University of New York, New York, N. Y.

J. Basic Eng 93(4), 643-648 (Dec 01, 1971) (6 pages) doi:10.1115/1.3425321 History: Received February 22, 1971; Online October 27, 2010

Abstract

This study is concerned with the application of Griffith fracture theory to crack propagation induced by thermal means. The stress-strain field around an insulated crack, situated perpendicular to a uniform flow of heat in an elastic medium, is extracted from an isothermal configuration in which the crack surfaces are subjected to linear shear stresses. Similarly, a stress-free plane of discontinuity in heated (or cooled) solid gives rise to a pressurized crack in an otherwise traction-free solid. Adopting Griffith’s energy balance approach to brittle fracture, approximate expressions are computed for the critical temperature and critical temperature gradient pertaining to a flat elliptical crack embedded in a three-dimensional solid which is conducting heat in a steady-state manner. The results indicate that these critical parameters increase rapidly as the ratio of the major to minor semiaxes of the ellipse approaches unity.

Copyright © 1971 by ASME
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