What kind of damage is described as smooth along the focal point of a gear?

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Study for the Aviation Maintenance Technician, Second Class (AMT2) Exam. Use flashcards and multiple choice questions, with hints and explanations provided for each question. Prepare for success!

Multiple Choice

What kind of damage is described as smooth along the focal point of a gear?

Explanation:
Fatigue damage shows up as a smooth, polished area along the contact line where the teeth engage. Repeated loading creates tiny surface cracks at the highest stress region (the focal point of contact). Those cracks grow and propagate under cyclic stress, often leaving a relatively smooth, glossy appearance along the line of action as the material yields and the crack advances. This is in contrast to abrasion, which leaves rough grooves from hard particles; corrosion, which forms pits and corrosion products; and impact damage, which causes dents or localized fractures from a single event.

Fatigue damage shows up as a smooth, polished area along the contact line where the teeth engage. Repeated loading creates tiny surface cracks at the highest stress region (the focal point of contact). Those cracks grow and propagate under cyclic stress, often leaving a relatively smooth, glossy appearance along the line of action as the material yields and the crack advances. This is in contrast to abrasion, which leaves rough grooves from hard particles; corrosion, which forms pits and corrosion products; and impact damage, which causes dents or localized fractures from a single event.

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