Optimum Replacement Interval for Mechanical Components Based on Fatigue Reliability

[+] Author and Article Information
Young H. Park1

Department of Mechanical Engineering, MSC 3450,  New Mexico State University, Las Cruces, New Mexico 88003ypark@nmsu.edu

Jun Tang

Center for Computer-Aided Design,  The University of Iowa, 226 Engineering Research Facility, Iowa City, Iowa 52242-1000jtang@ccad.uiowa.edu


Corresponding author.

J. Pressure Vessel Technol 129(4), 683-688 (Oct 25, 2006) (6 pages) doi:10.1115/1.2767359 History: Received March 15, 2006; Revised October 25, 2006

This paper introduces a maintenance decision-making strategy in the general area of replacement and reliability of mechanical components. The decision-making strategy involves the optimization of replacement interval calculated from fatigue failure of mechanical components. The proposed approach is based on the cumulative damage distribution function for evaluating mean fatigue life. Using this approach, the analytical expressions for mean and variance of the cumulative damage distribution under both stationary narrow-band and stationary wide-band random process are provided. The mean value and variance of fatigue life distribution are then evaluated to determine the optimal replacement intervals under fatigue failure. A practical example is presented to demonstrate the application of the present method.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Failure distribution function

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Figure 2

Passenger vehicle fuel tank

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Figure 3

Loading time history



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