Abstract

Abstract The usage history of aerospace structures may include cyclic loads of either constant or varying amplitude, fluctuations in temperature, or a corrosive environment. This section deals with the effects of cyclic loads, which lead to material degradation over time, due to the initiation and growth of cracks; this degradation can eventually result in failure (fatigue). Thus, a reliable prediction of component fatigue life is critical to aircraft safety. This is even more important as the average age of the world's transport fleet continues to rise. This section provides a general overview of the approaches, based on fracture mechanics, which have been developed to arrive at an estimate of fatigue life or at an inspection interval (damage tolerance) with the goal of ensuring component safety.

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