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RESEARCH PAPERS

Response of Short Cracks in High-Strength Steels to Fatigue Loadings—Part I: Behavior in Air and Freely Corroding in Seawater

[+] Author and Article Information
K. Kim

Korea Maritime University, Pusan, Korea

W. H. Hartt

Center for Marine Materials, Department of Ocean Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431

J. Offshore Mech. Arct. Eng 117(3), 183-191 (Aug 01, 1995) (9 pages) doi:10.1115/1.2827088 History: Received November 28, 1994; Revised March 14, 1995; Online December 17, 2007

Abstract

Experiments have been performed which determined the growth rate of short cracks (initial depth ~ 0.1 mm) for five high-strength steels (yield stress 370–570 MPa) in air and natural seawater. Attention was focused on regions I and II of the classical da/dN-ΔK curve with test conditions being relevant to offshore structure service. The results indicated enhanced growth rate for short fatigue cracks (a ⪝ 1 mm) in both environments. Parameters with which short crack fatigue behavior might best be correlated were investigated, and it was found that the enhanced fatigue crack growth rate associated with short cracks transitioned to long crack growth kinetics at a ΔK value which depended only upon environment. The significance of the results are discussed within the context of offshore structure integrity.

Copyright © 1995 by The American Society of Mechanical Engineers
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