SYMPOSIA PAPER Published: 01 January 1981
STP29330S

Some Considerations in the Statistical Determination of the Shape of Curves

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This paper discusses the need for defining the shape of S-N curves, the various kinds of test data available for this purpose, and the problems in their statistical evaluation, including the assumptions that must be made.

A method is proposed for finding the “cutoff” point, that is the endurance at which conventionally shaped S-N curves change slope to the horizontal. It is based on maximum likelihood principles and deals with runouts in a statistically acceptable way. A sharp or a continuous transition from the horizontal to the sloped straight line log S/log N curve may be considered.

The method can be used for analysis and comparison of fatigue test results with a computer program, described and listed elsewhere by the authors, but it is subject to certain amendments, which are described in the paper.

Author Information

Spindel, JE
British Railways Board, London, Great Britain
Haibach, E
Fraunhofer-Institut für Betriebsfestigkeit (LBF), Darmstadt, Federal Republic of Germany
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Details
Developed by Committee: E08
Pages: 89–113
DOI: 10.1520/STP29330S
ISBN-EB: 978-0-8031-4810-9
ISBN-13: 978-0-8031-0716-8