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The purpose of this paper is to promote consideration of variable amplitude or spectrum fatigue loading as a useful tool for screening effects of alloy microstructure on fatigue crack-propagation resistance. Increased sensitivity to microstructure, practical interpretation, and economy of testing are offered as rationale for advantageous use of this type of test.
fatigue (materials), microstructure, crack propagation, alloys
Staff engineer, Engineering Properties and Design Division, Aluminum Company of America, Alcoa Laboratories, Alcoa Center, Pa.