A compositional method to model dependent failure behavior based on PoF models

• Published in: Chinese journal of aeronautics Vol. 30; no. 5; pp. 1729 - 1739
• Main Authors: ZENG, Zhiguo, CHEN, Yunxia, ZIO, Enrico, KANG, Rui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2017; Elsevier
• Subjects: Degradation; Dependent failures; Engineering Sciences; Multiple dependent competing failure processes; POF; Reliability modeling; Shock; 失效机理; 失效行为; 机理模型; 概率模型; 物理模型; 确定性模型; 组合方法; Degradation; Shock; Reliability modeling; Multiple dependent competing failure processes; Dependent failures; multiple dependent competing failure processes; physics-of-failure; reliability modeling
• ISSN: 1000-9361
• DOI: 10.1016/j.cja.2017.05.009

In this paper, a new method is developed to model dependent failure behavior among failure mechanisms. Unlike the existing methods, the developed method models the root cause of the dependency explicitly, so that a deterministic model, rather than a probabilistic one, can be established. Three steps comprise the developed method. First, physics-of-failure（PoF） models are utilized to model each failure mechanism. Then, interactions among failure mechanisms are modeled as a combination of three basic relations, competition, superposition and coupling. This is the reason why the method is referred to as ＂compositional method＂. Finally, the PoF models and the interaction model are combined to develop a deterministic model of the dependent failure behavior. As a demonstration, the method is applied on an actual spool and the developed failure behavior model is validated by a wear test. The result demonstrates that the compositional method is an effective way to model dependent failure behavior.