Effects of Replication on Measured S-N Curves of Metals

Abstract:

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Replication, or repeated tests at the same stress amplitude, is used to provide statistical confidence in life data during the development of S-N curves. This paper discusses the effects of replication on the measurement of S-N curves and presents an alternative to traditional replication methods for the determination of S-N curves, particularly for the development of preliminary S-N curves. Using specimens made out of the extruded bars of a magnesium alloy, it is demonstrated that the S-N curve estimated using the data from non-replication tests is almost same as that from replication tests. The advantage of using non-replication fatigue tests is that it uses fewer specimens, in this instance, only half of that required for 50% replication fatigue test, to achieve the same estimation as that of the replication fatigue tests. Another advantage of using non-replication fatigue tests is that it can detect the non-linearity using limited specimens.

Info:

Periodical:

Edited by:

George Ferguson, Ashvin Thambyah, Michael A Hodgson and Kelly Wade

Pages:

35-38

DOI:

10.4028/www.scientific.net/AMR.275.35

Citation:

K. Duan et al., "Effects of Replication on Measured S-N Curves of Metals", Advanced Materials Research, Vol. 275, pp. 35-38, 2011

Online since:

July 2011

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$35.00

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