Which statement best describes fatigue damage in aircraft structures?

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Multiple Choice

Which statement best describes fatigue damage in aircraft structures?

Fatigue damage is caused by repeated, cyclic loading that leads to small cracks forming and then growing in a localized area over many cycles. Each load reversal or cycle stresses a material near a flaw or stress concentrator—like a rivet hole, sharp corner, or surface defect. Although the individual loads may be well below the material’s yield strength, the cumulative effect of many cycles gradually propagates cracks until eventual failure. This is why fatigue is described as progressive and localized: it starts in a specific area and advances with continued cycling. Corrosion or fretting can accelerate fatigue by creating or enlarging crack initiation sites, but the fundamental issue is the repetitive nature of the loading, not a single impact or a non-structural problem.

Fatigue damage is caused by repeated, cyclic loading that leads to small cracks forming and then growing in a localized area over many cycles. Each load reversal or cycle stresses a material near a flaw or stress concentrator—like a rivet hole, sharp corner, or surface defect. Although the individual loads may be well below the material’s yield strength, the cumulative effect of many cycles gradually propagates cracks until eventual failure. This is why fatigue is described as progressive and localized: it starts in a specific area and advances with continued cycling. Corrosion or fretting can accelerate fatigue by creating or enlarging crack initiation sites, but the fundamental issue is the repetitive nature of the loading, not a single impact or a non-structural problem.

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