Discussion
Match each design philosophy in List I with its defining feature in List II.
List I
A. Safe-life
B. Fail-safe
C. Damage tolerance
D. Static strength only
List II
1. An alternative load path if one member fails
2. Retirement at a fixed life regardless of inspection
3. Carries limit and ultimate load, with no fatigue consideration
4. Known crack growth rates set the inspection interval
Select the correct match.
Answer: D
The three fatigue philosophies form a historical progression, each responding to the shortcomings of the last, and modern transport certification rests on damage tolerance with safe-life retained only where redundancy cannot be provided.
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