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Title:Influence of grain size on fatigue notch sensitivity
Author(s):Karry, R.W.; Dolan, Thomas J.
Grain Size
Abstract:A study was made of the reduction in flexural fatigue strength caused by a circumferential notch in specimens of a single-phase metal. Groups of specimens were prepared from 70-30 brass having the same chemical analysis but processed to obtain three different degrees of cold reduction and three different annealed grain sizes. Two notch shapes having the same depth but different root-radii were investigated. It was found that the fatigue strength reduction factor and notch-sensitivity were not unique material constants; these were dependent upon both the grain size of the metal and the notch root-radius. An increase in grain size produced a significant lowering of the fatigue strength, but also resulted in a decrease of notch-sensitivity and fatigue strength reduction factor. Experimentally determined fatigue strength reduction factors were somewhat smaller than those computed from H. Neuber’s theory of the effect of an elementary particle on notched material behavior. On comparing fatigue strengths developed, a correlation was found between the average stress acting on a grain located in the critically stressed surface of a notched specimen and that in an unnotched specimen having the same grain size.
Issue Date:1952-06
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 30
Genre:Technical Report
Sponsor:Office of Naval Research, U. S. Navy, Contract N6-ori-71, Task Order IV; Project NR-031-005
Rights Information:Copyright 1952 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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