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RESEARCH PAPERS

Residual Stress Effects on Fatigue Crack Growth Behavior in Stainless Steel Welds

[+] Author and Article Information
W. J. Mills, L. A. James

Westinghouse Hanford Company, Richland, Wash. 99352

J. Pressure Vessel Technol 109(3), 336-339 (Aug 01, 1987) (4 pages) doi:10.1115/1.3264874 History: Received August 14, 1986; Revised March 06, 1987; Online November 05, 2009

Abstract

Standard fatigue precracking of fracture toughness specimens taken from stainless steel welds with a double-V design was found to result in extremely uneven crack fronts. Material variability within the weld zone could not explain the irregular crack fronts, which must therefore be associated with residual stress effects. Uniform fatigue cracks could be obtained by sectioning the double-V weld at the mid-thickness to relieve residual stresses and by precracking at a stress ratio of 0.4. Residual stresses can impact the leak-before-break position for welded structures.

Copyright © 1987 by ASME
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