SEDL / STP / STP462-EB / STP32041S

Fatigue Life of 2024-T3 Aluminum Alloy Under Narrow- and Broad-Band Random Loading

Hillberry, BM
Assistant Professor of Mechanical EngineeringPersonal Member, Purdue UniversityASTM, Lafayette, Ind.

Pages: 17    Published: Jan 1970

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Abstract

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.