Structural fatigue is the progressive degradation of a material caused by repeated cyclic stress loading. Fatigue damage accumulates even when peak stress levels remain well below the material's rated tensile strength making it a primary concern in aerospace structures subject to vibration thermal cycling and repeated pressurization and depressurization events.
Detecting fatigue before it becomes structural failure requires continuous analysis of vibration and load channels across many test cycles. Sift enables structural engineers to build rules that flag anomalous stress signatures, compare load data across missions, and identify channels showing progressive deviation that may indicate fatigue accumulation.