The factors influencing the fatigue strength of metal members are discussed from the viewpoint of their applicability to design of pressure vessels. Stress range and number of cycles of loading are of primary importance in determining whether fatigue failure may develop. The types of blemishes, notches or recesses in the contour determine the severity of the peak stresses from which progressive fractures will initiate. Consideration is given to environmental conditions such as effect of temperature, erosion, or periodic rest periods in the life of the vessel. The presence of fusion welded joints of high quality have no deleterious effects, but can lead to marked reductions in fatigue strength if improperly designed or inherently defective. In general, thick-walled vessels are likely to be more suceptible to fatigue failure than low-pressure thin-walled containers, but all vessels having long life and which are subjected to a large number of pressure fluctuations in service should be deisgned to insure adequate fatigue resistance by eliminating excessive stress-raisers and by carefully controlling fabrication and operation procedures. Fatigue data are statistical in nature being influenced by chance effects in sampling, manufacture, and testing; thus exact design procedures are not available and the designer must be satisfied by attaining a fairly high probability that the member will not develop fatigue failure within the normal service life. It is fortunate that small decreases in the peak stresses are accompanied by large increases in fatigue life. Thus the elimination of severe stress raisers is the principal hurdle and is the most effective method of insuring safety against progressive fracture.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
TAM R 40
1967-0337
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112117
Sponsor(s)/Grant Number(s)
Welding Research Council Pressure Vessel Research Comm 53/08
Copyright and License Information
Copyright 1953 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.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
