Research on calculation method of fatigue average failure rate of parts

Abstract

Failure rate, average failure rate and average residual life determine the life distribution and reliability of structures, which play a very important role in the reliability research of mechanical products. Based on the basic in-dex of reliability measurement, the relationship between fatigue reliability coefficient and reliability is deduced when the life distribution is two parameter Weibull distribution. A method for calculating the structural failure rate and av-erage failure rate is proposed based on fatigue reliability coefficient, and the corresponding calculation process is de-rived. Based on the existing fatigue life test data of integral lap panel structure, the proposed method and the tradi-tional integral method are used to calculate the average failure rate and error analysis of integral lap panel structure.The results show that the derived calculation formula has a simple form, is easy to calculate, and has high accuracy.It is of great significance for FMECA (failure mode effects and criticality analysis) and maintenance decision-mak-ing of mechanical structure.

Keywords

• reliability index
• average failure rate
• fatigue reliability coefficient
• fatigue life
• maintenance decision making