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On the inverse power laws for accelerated random fatigue testing

By Giuliano Allegri and Xiang Zhang

Abstract

This paper addresses the usage of inverse power laws in accelerated fatigue testing under wide-band Gaussian random loading. The aim is not at predicting an absolute value of fatigue life but assessing the fatigue damage relative accumulation. The widely accepted inverse power scaling laws in fatigue damage assessment is discussed, reviewing the engineering standards and pointing out their inherent limitations. A physically consistent general scaling law is obtained by rigorous mathematical analysis in the framework of random vibration theory and the rules of safe-life fatigue analysis. Simplifications of the general scaling rule are presented, highlighting conditions under which the current standard practice could provide a correct an acceptable estimation of the relative fatigue damage accumulation

Topics: Fatigue, Inverse power law, Random loading, Cycle counting, Accelerated testing
Publisher: Elsevier Science B.V., Amsterdam.
Year: 2008
DOI identifier: 10.1016/j.ijfatigue.2007.08.023
OAI identifier: oai:dspace.lib.cranfield.ac.uk:1826/3108
Provided by: Cranfield CERES
Journal:

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