University of Illinois Urbana-Champaign

Critical review of criteria for notch sensitivity in fatigue of metals

Yen, C.S.; Dolan, Thomas J.

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https://hdl.handle.net/2142/111818

Description

Title
Critical review of criteria for notch sensitivity in fatigue of metals
Author(s)
  • Yen, C.S.
  • Dolan, Thomas J.
Issue Date
1949-11
Keyword(s)
  • Notch-sensitivity
  • Metal Fatigue
  • Endurance Limits
  • Notched Rotating Beam Fatigue
Abstract
It was the purpose of this report to summarize and to appraise critically the numerous interpretations and correlating methods that have been proposed in the technical literature to compare the endurance limits for notched rotating beam fatigue specimens with those of unnotched specimens. The interrelation of the ideas proposed by several investigators were also studied. After surveying all relevant hypotheses it was summarized that notch-sensitivity of a metal member depends upon three different factors, namely: (a) the basic material characteristics, of which the local work-hardening (or strain strengthening) capacity may be considered as an index; (b) degree of material homogeneity, which is influenced by inherent defects , tensile residual stresses, heat treatments etc.; (c) geometry of the specimen, (including over-all size); the radius at the root of notch is of prime importance in this geometric factor. It was concluded that the criterion for fatigue failure and for endurance limit should include not only the stress value at the critical point as is conventionally assumed, but also the conditions existing in a critical region or volume surrounding the point. A rational approach and procedure for attacking the problem of notch effect as well as size effect is suggested.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 13
  • 1967-0311
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/111818
Sponsor(s)/Grant Number(s)
Office of Naval Research, U. S. Navy, Contract N6-ori-71, Task Order IV; Project NR-031-005
Copyright and License Information
Copyright 1949 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.