A compositional method to model dependent failure behavior based on PoF models
Résumé
In this paper, a new method is developed to model dependent failure behaviors among failure mechanisms. Unlike 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 behaviors. 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 behaviors.
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