Finite Element Based Fatigue Calculations
Bishop, N, W, M, and Sherratt, F
First Published - November 2000
Hardback, 131 Pages
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 Fatigue analysis procedures for the design of modern structures
rely on techniques, which have been developed over the last 100
years or so.
Initially these techniques were relatively simple procedures, which
compared measured constant amplitude stresses (from prototype
tests) with material data from test coupons. These techniques have
become progressively more sophisticated with the introduction of
strain based techniques to deal with local plasticity effects.
Nowadays, variable amplitude stress responses can be dealt with.
Furthermore, techniques exist to predict how fast a crack will grow
through a component, instead of the more limited capability to
simply predict the time to failure. Even more recently techniques
have been introduced to deal with the occurrence of stresses I more
than one principal direction (multi-axial fatigue) and to deal with
vibrating structures where responses are predicted as PSDs (Power
Spectral Densities) of stress.
Today, 95% of all fatigue design calculations are covered by one of
three approaches, i.e., Stress-Life or Crack-Propagation.
Furthermore, since stress or strain are governing variables it has
been usual to test prototype components in order to obtain the
required data needed for the fatigue analysis.
However, with the introduction of Finite Element Analysis (FEA)
techniques, has come the possibility of doing fatigue calculations
long before a prototype exists. Furthermore, a dramatic improvement
in computing power has made FE based fatigue life calculations a
routine task. FE has been around for some time and is now a mature
technology. The purpose of this book is to provide an introduction
to the basic underlying concepts of fatigue analysis within the FE
environment.
This goal can be stated further as to give engineers involved in FE
a basic understanding of fatigue; and to give engineers involved in
fatigue a basic understanding of FE. A number of examples are used
throughout the text to illustrate the concepts and potential
applications.
Contents
Introduction
Why FEA based fatigue design?
Different Philosophies ad Life Estimation Models.
The Stress-Life (S-N) Approach.
The Strain-Life (
e -N) Approach.
Crack Propagation Analysis Using LEFM
Multi-axial Fatigue Analysis.
Vibration Fatigue Analysis.
FE Model Building and Post Processing Issues.
Bibliography
Members Price: £32 ( $62 / €40 )
Non-Members Price: £65 ( $127 / €82 )
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