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Study of Hazard Rate Functions on the Cumulative Damage Phenomenon

Published online by Cambridge University Press:  31 March 2011

K. S. Wang
K. S. Wang*
Affiliation:
Department of Mechanical Engineering, National Central University Jhongli, Taiwan 32001, R.O.C.
*
*Chair Professor, corresponding author
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Abstract

In this paper different failure mechanisms which yield cumulative damage are investigated through two types of hazard rate functions. They have been studied during the past two decades. Type A was developed early by assuming the hazard rate as a function of reliability. There are two kinds of trend, one follows the negative logistic decay model, the other the negative Gompertz decay. Some modifications are suggested according to the failure tendency and convenience of fittings. Type B is developed recently by assuming the hazard rate as a function of the expected operation time, T, which is defined as the integration of reliability over the time, normalized by the mean-time-between-failure. In both types the proposed hazard rates grow with the time monotonically. Typical examples are taken to examine these models, meanwhile the comparisons with the Weibull-typed distribution are also made. The results show that the most of proposed relations are successful in the expression of cumulative damage phenomenon, especially the Type B is a better choice even compared with the Weibull-typed description in some respects. The advantages of the models are discussed based on the physical meanings involved in the parameters.

Keywords

Hazard rate functionCumulative damage
Type
Articles
Information
Journal of Mechanics , Volume 27 , Issue 1 , March 2011 , pp. 47 - 55
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2011

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