Stress-Corrosion Cracking and the Interaction Between Crack-Tip Stress Field and Solute Atoms

[+] Author and Article Information
H. W. Liu

Department of Chemical Engineering and Metallurgy, Syracuse University, Syracuse, N. Y.

J. Basic Eng 92(3), 633-638 (Sep 01, 1970) (6 pages) doi:10.1115/1.3425090 History: Received January 10, 1969; Online October 27, 2010


Based on the elastic interaction between a solute atom and a tensile crack-tip stress field, a mechanism of stress-corrosion cracking was proposed and analyzed. This elastic interaction provides a potential for solute atoms to migrate toward the tip of a crack. The elastic interaction and the equilibrium concentration of solute atoms near a crack tip were calculated. The solute atom concentration increases rapidly toward the crack tip if the solute atom is interstitial or if it relaxes the crack-tip stress field. The high concentration of solute atoms at the tip of a crack will enhance the reaction between solute and solvent atoms. The weak fracture strength of the reaction product may cause crack growth. Two crack growth models were analyzed: One is based on the assumption of the “homogeneity” of the fracture and deformation properties of a material, and the other takes a structural size of a material into consideration. The proposed models are compared with available data on magnesium-aluminum alloy, 4340 steel, and soda-lime glass.

Copyright © 1970 by ASME
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