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RESEARCH PAPERS

A Study of the Notch Effect and of Specimen Design and Loading on the Fatigue Properties of Cast Steel

[+] Author and Article Information
J. F. Wallace, C. Vishnevsky

Department of Metallurgy, Case Western Reserve University, Cleveland, Ohio

C. W. Briggs

Technology, Steel Foundry Research Foundation, Rock River, Ohio; Department of Metallurgy, Case Western Reserve University, Cleveland, Ohio

J. Basic Eng 90(1), 51-57 (Mar 01, 1968) (7 pages) doi:10.1115/1.3605064 History: Received August 16, 1967; Online November 03, 2011

Abstract

Scope of the research report: The purpose of the research included in this report is to extend the knowledge on the fatigue properties of cast steel by presenting a study of the effect of notches on fatigue properties and the effect of specimen design and the method of loading on the fatigue properties of cast steel. Summary of the research report conclusions: (a) Notch Effect—A severe notch (0.015-in. radius) in fatigue testing of cast steel results in a 36 percent reduction in endurance limit based on unnotched specimens. An extremely severe notch (0.001 in. radius) results in a 42 to 53 percent reduction in the endurance limit. The fatigue strength reduction factor Kf for extreme notched specimens is appreciably higher for cast steel in the quenched and tempered condition. (b) Specimen Design and Loading—Cast steel exhibits better endurance properties in reversed torsion than reversed bending. Bending fatigue tests of cast steel tested at 1800 rpm result in lower endurance properties than rotating beam tests at 10,000 rpm. The difference is greater at the higher tensile strength level.

Copyright © 1968 by ASME
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