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- Title
Inverse Power Law Model for Extrapolation of Fatigue Life Curves.
- Authors
Azrulhisham, E. A.; Wahab, D. A.; Abdullah, S.; Nikabdullah, N.; Che Haron, C. H.
- Abstract
In view of increasing pressures of shortened development cycles and desire to save costs, inverse power law scaling has been devised for operative life estimation based on accelerated laboratory test data extrapolation. Derived from the Coffin-Manson's model of fatigue life, this analytical solution however is not capable in addressing probabilistic nature of fatigue. This paper is aimed to provide further insight into the operative life estimation based on parametric models derived from integration of inverse power law stress-life model and probabilistic fatigue life distributions. Maximum likelihood estimation is applied in deriving the parameters of the parametric models and the probabilistic fatigue life curves are obtained from reliability function of accelerated laboratory test data. PSN and PεN curves at operative life as well as any life region can be estimated based on inverse power law acceleration factors. The procedures presented in this study can be applied in estimating the probabilistic fatigue life curves at an accelerated pace resulting in shortened development cycles.
- Subjects
FATIGUE life; POWER law (Mathematics); EXTRAPOLATION; MAXIMUM likelihood statistics; PROBABILITY theory; RELIABILITY in engineering; STRAINS &; stresses (Mechanics)
- Publication
International Review of Mechanical Engineering, 2012, Vol 6, Issue 3, p685
- ISSN
1970-8734
- Publication type
Article