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Title:Fatigue life as influenced by short periods of overstress TR
Author(s):Sinclair, G.M.; Dolan, Thomas J.
Abstract:Based, in part, on the results of a previous research report an investigation was made to determine the possible existence of a “delay time” or nucleation period for initiation of fatigue damage in 75S-T6 aluminum alloy. Statistical measurements of the changes in fatigue life caused by periodic cycles of overstress ranging from 10 per cent to as little as 1 per cent of the total life showed no discontinuity in cumulative fatigue damage as a function of the duration of the overstress. It was concluded that the nucleation period for initiation of fatigue damage in this alloy is negligibly small. In addition, calculations based on an expression derived for cumulative fatigue damage indicated that all cracks are not nucleated immediately on the first few loading cycles, but that some nucleation of cracks probably occurs throughout the lifetime of the specimen.
Issue Date:1955-06
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 85
Genre:Technical Report
Sponsor:Office of Naval Research, Department of the Navy, Contract No. N6ori-071(04), Project NR-031-005
Rights Information:Copyright 1955 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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