The influence of “shape of cross-section” on the fatigue strength of 24S-T aluminum alloy was investigated. Previous work indicated that (a) a large amount of material exposed to peak stress and (b) exposed sharp edges were two major factors that contributed to a reduction of fatigue strength. Five cross-sections including circular, square, modified square (rounded edges), diamond and modified diamond (rounded edges) were investigated. From 6 to 12 specimens of each cross-section were tested and the data were analyzed by averaging over the range of lifetimes obtained to increase the reliability of the results. The influence of the two “shape” effects on fatigue strength were separated. It was found that sharp edges decreased the fatigue strength approximately 10 per cent as compared to 1/8 inch radius rounded edges and the fatigue strength decreased approximately as the logarithm of the area of material exposed to peak stress.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
TAM R 84
1967-0380
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112606
Sponsor(s)/Grant Number(s)
Office of Naval Research, U.S. Navy, Contract N6-ori-071(04), Project NR-031-005
Copyright and License Information
Copyright 1955 Board of Trustees of the University of Illinois
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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