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RESEARCH PAPERS

A New Parameter for Characterizing Corrosion Fatigue Crack Growth

[+] Author and Article Information
T. Shoji, H. Takahashi

Department of Engineering Science, Tohoku University, Sendai, Japan

M. Suzuki

Tohoku University

T. Kondo

Division of Nuclear Fuel and Materials, Japan Atomic Energy Research Institute, Tokai, Ibaragi-ken, Japan

J. Eng. Mater. Technol 103(4), 298-304 (Oct 01, 1981) (7 pages) doi:10.1115/1.3225020 History: Received September 23, 1980; Online September 15, 2009

Abstract

The role of mechanical factors, such as ΔK, R, and K̇ (loading rate), and its significance on corrosion fatigue crack growth acceleration were discussed in terms of crack tip strain rate and/or nucleation rate of fresh metal surface. A new parameter for characterizing corrosion fatigue crack growth was proposed, paying attention to rates of crack tip mechanochemical reactions, i.e., oxide film rupture rate, passivation rate, and solution renewal rate, which are influenced by the crack tip mechanical condition, microstructure of material, and environment. Hence a new parameter da/dt] air , the time base pure fatigue crack growth rate which was related closely to crack tip deformation rate, was introduced as a measure of actual crack tip strain rate. In various combinations of materials and environments, it was shown that the value of da/dt] air determines a crack growth rate in the environment, irrespective of mechanical factors such as ΔK, Kmax , R, and K̇, or frequency.

Copyright © 1981 by ASME
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