Fatigue limit estimated using finite lives

Author: LORÉN S.

Source: Fatigue & Fracture of Engineering Materials & Structures, Volume 26, Number 9, September 2003 , pp. 757-766(10)

Publisher: Blackwell Publishing

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Abstract:

For metallic material one is interested in estimating the fatigue limit although it is impossible to test if a specimen has infinite life. In this paper two models are compared. One model estimates the fatigue limit and another estimates the endurance limit. The model which estimates the endurance limit is a model which only uses the information that a specimen has broken or not broken at a certain stress level. The model which estimates the fatigue limit also uses the information about when the specimen is broken, i.e., after how many cycles the specimen breaks. The two models are compared, both on real and simulated staircase tests. It is shown that it is possible to estimate the distribution of the fatigue limit although the fatigue limit itself is impossible to observe. When the two models give very different estimates it indicates that the chosen run-out level is too low.

Keywords: censoring; endurance limit; information matrix; maximum likelihood; staircase test

Document Type: Research article

DOI: 10.1046/j.1460-2695.2003.00659.x

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