What is fatigue damage and how is it detected?

Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Multiple Choice

What is fatigue damage and how is it detected?

Fatigue damage is progressive and localized structural damage caused by cyclic loading, where small cracks initiate at stress concentrators such as holes, scratches, or pits and grow with each load cycle until the part can no longer carry the load. Because the damage often starts beneath the surface or is too small to see, it isn’t reliably found by casual visual checks alone. Detecting fatigue relies on regular inspections and non-destructive testing techniques to locate and size cracks before they become critical. Visual inspection can catch obvious surface flaws, while methods like dye penetrant, magnetic particle, eddy current, ultrasonic, and radiographic testing reveal surface-breaking and subsurface cracks. This combination—inspections plus NDT—provides effective fatigue detection. It’s not about random corrosion or damage from a single overload without cycles, and while fatigue applies to both metals and composites, the emphasis here is on the cyclic, progressive nature and how it’s found.

Fatigue damage is progressive and localized structural damage caused by cyclic loading, where small cracks initiate at stress concentrators such as holes, scratches, or pits and grow with each load cycle until the part can no longer carry the load. Because the damage often starts beneath the surface or is too small to see, it isn’t reliably found by casual visual checks alone. Detecting fatigue relies on regular inspections and non-destructive testing techniques to locate and size cracks before they become critical. Visual inspection can catch obvious surface flaws, while methods like dye penetrant, magnetic particle, eddy current, ultrasonic, and radiographic testing reveal surface-breaking and subsurface cracks. This combination—inspections plus NDT—provides effective fatigue detection. It’s not about random corrosion or damage from a single overload without cycles, and while fatigue applies to both metals and composites, the emphasis here is on the cyclic, progressive nature and how it’s found.

More practice questions