Discussion
Match each fatigue-related phenomenon in List I with where it typically occurs in List II.
List I
A. Fretting fatigue
B. Corrosion fatigue
C. Widespread fatigue damage
D. Overload retardation
List II
1. In humid environments, at pits acting as initiation sites
2. At clamped interfaces undergoing micro-slip
3. In a variable-amplitude spectrum containing occasional large cycles
4. At many similar details in an ageing airframe
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Each phenomenon belongs to a distinct condition. Fretting fatigue arises at clamped interfaces where micro-slip damages the surface, corrosion fatigue in humid environments where pits become initiation sites, widespread fatigue damage at the many similar details of an ageing airframe, and overload retardation in a spectrum containing occasional large cycles, whose plastic zone slows the subsequent growth.
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