Series System Failure Rate Modeling and the Mechanism to Yield Bathtub Curve
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.
Discrete failure rate load-strength interaction multiple load action strength degradation
Liyang Xie Wenqiang Lin Mingchuan Zhang Shaoze Yan
Dept Mech.Eng., Northeastern University, Shenyang, 110819, China Dept Precision Instruments and Mechanology, Tsinghua University, Beijing, 100095, China
国际会议
台湾
英文
4858-4862
2011-12-11（万方平台首次上网日期，不代表论文的发表时间）