Abstract
Multiple Site Damage (MSD) and Widespread Fatigue Damage (WFD) became a concern after the Aloha incident in 1988. Both, Multiple Site Damage and Widespread Fatigue Damage are typical effects which may occur in structures of aging aircraft. They consist in the development of scenarios of sets of small cracks, which interact at a certain stage and may suddenly burst into one large crack. The chapter consists of five topics, namely the description of the relevance of such an assessment method from an industrial point of view, the fast calculation method, which is used to account for the interaction of cracks in riveted joints, a Monte Carlo Simulation (MCS) method based on the model mentioned above, typical results of such a MCS procedure and its validation and in the end some considerations of methods which may be used to improve the calculation effort needed for a MCS.
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