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Which one of the following failure theories is the most conservative design approach against fatigue failure?

1. Soderberg line
2. Modified Goodman line
3. Gerber line
4. Yield line

Correct answer: Soderberg line

Solution

The Soderberg line is considered the most conservative design approach against fatigue failure because it incorporates both the yield strength and the endurance limit, ensuring a greater safety margin by accounting for the effects of mean stress on fatigue life.

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