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Title:Experiments in fatigue under ranges of stress in torsion and axial load from tension to extreme compression
Author(s):Findley, William N.
Axial Load
Abstract:Axial-load fatigue tests were performed on SAE 4340 steel at mean stresses from 40,000 psi in tension to 135,000 psi in compression (a stress equal to the tensile strencth). Elaborate precautions were taken to insure axial loading of specimens. In the extreme compression tests the entire stress cycle was a compression stress of 20,000 psi or ~reater. This \·ras done to determine trhether fatii::;ue cracks could form and propaGate in a cycle containinG no tensile stresses - even from residual stresses. A techni~ue for doublinc the yield point in compression was also demonstrated and used in these faticue tests. An experiment was also pc.rformed on 75 S-T aluminum alloy to determine whether the larGe effect of mean stress on the fatigue strenGth in tension, and in torsion was due to the chanGe in structure of the material resultinc from inelastic action or to other causes. A similar test was made of the same alloy in torsion fatieue to evaluate the influence of the complementary nor~al stress.
Issue Date:1954-05
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 59
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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