growth of those cracks. The objective of a designer is to determine when large numbers of small cracks could degrade the joint strength to an unacceptable level. The in-flight loss of part of the fuselage from Aloha Airlines Flight 243 was attributed to multi-site fatigue damage.

Categories of WFD

Several factors can influence the occurrence of WFD, like design issues and probabilistic parameters like manufacturing, environment etc.Two categories of WFD are:

Multi-Site Damage (MSD)

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