Published: Jan 1970
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Narrow- and broad-band random fatigue tests were conducted on small cantilever specimens of 2024-T3 aluminum alloy. A slightly longer fatigue life was found with the broad-band loading. Both the Palmgren-Miner and Corten-Dolan theories were found to overestimate the fatigue life. A proposed equivalent-crack-length theory shows good agreement with the test results. Also, a means for comparing the fatigue life under different types of random loading is illustrated. In this work fatigue life is based on the number of peaks to failure.
fatigue, random loading, narrow band, broad band, spectrum, cumulative damage, aluminum
Assistant Professor of Mechanical EngineeringPersonal Member, Purdue UniversityASTM, Lafayette, Ind.