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Title:Combined bending and torsion fatigue tests of 25S T aluminum alloy
Author(s):Findley, W.N.; Mitchell, W.I.; Martin, D.E.
Fatigue Tests
Aluminum Alloy
Abstract:Fatigue data for 25S-T aluminum alloy are presented for com pletely reversed cycles of bending, torsion and three different combinations thereof. The S-N diagrams of these data are presented in terms of the alternating principal shear stress T1,and shown to be express ible by the power relation Tl= BNa; where the exponent a is the same for each state of stress and the coefficient B varies with different states of stress. The merits of six theories of failure, relative to their agreement with these test data are discussed. The principal shear stress theory corrected for anisotropy and the octahedral shear stress theory best represented the data. Further consider ation was given to the physical significance of several of these theories, and to the possible effect of anisotropy on the fatigue behavior under combined stress.
Issue Date:1954-01
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 56
Genre:Technical Report
Sponsor:Office of Ordnance Research , Ordnance Corps, Department of the Army, Contract No. DA-11-022-ORD-995, Project No. TB2-0001(313)
Rights Information:Copyright 1954 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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