Fatigue can lead to structural failure over time from "summary" of Aircraft Structures & Systems EASA Module 13 B2 by
Fatigue is a phenomenon that can occur in materials subjected to repeated loading and unloading. This can happen over an extended period, leading to structural damage that may not be immediately apparent. The process of fatigue involves the development and propagation of cracks within the material, which can eventually result in structural failure. When an aircraft is in operation, it is subjected to various forces and stresses during flight. These forces can cause small cracks to form within the structure, especially in areas where there are changes in geometry or stress concentrations. Over time, these cracks can grow in size due to the repeated loading and unloading cycles experienced during flight, a process known as fatigue crack growth. If left unchecked, these crack...
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