Paper Title:
Series System Failure Rate Modeling and the Mechanism to Yield Bathtub Curve
  Abstract

Failure rate functions were usually constructed in terms of life distribution. The present paper defines “discrete failure rate”, analyzes the dependence of failure rate curve shape on the probabilistic property of load-strength interaction, and develops load-strength-interaction based system failure rate model. For the majority of mechanical equipment, operation load is normally a random process, components are subjected to a large number of stochastic load actions during its service life. Meanwhile, material property degrades continuously owing to the failure mechanisms such as fatigue. It is the ever changing load-strength relationship that yields the variation in failure rate. Based on the criterion that failure occurs when a load higher than the relevant strength appears, failure rate model is developed based on the interaction mechanism between load and residual strength, and their statistical characteristics as well. Based on the interpretation to the variation of failure rate in terms of load uncertainty and strength uncertainty, the effect of statistical risk of load and the effect of strength degradation on failure rate curve shape are highlighted.

  Info
Periodical
Chapter
Chapter 8: System Modeling and Simulation
Edited by
Dongye Sun, Wen-Pei Sung and Ran Chen
Pages
4858-4862
DOI
10.4028/www.scientific.net/AMM.121-126.4858
Citation
L. Y. Xie, W. Q. Lin, M. C. Zhang, S. Z. Yan, "Series System Failure Rate Modeling and the Mechanism to Yield Bathtub Curve", Applied Mechanics and Materials, Vols. 121-126, pp. 4858-4862, 2012
Online since
October 2011
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Price
$32.00
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