Discussion
Consider the following statements about S-N curves:
1. Steels typically show an endurance limit below which failure does not occur.
2. Aluminium alloys do not show a true endurance limit.
3. The number of cycles is usually plotted on a linear scale.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: ferrous materials show a genuine endurance limit, typically near half the ultimate, below which the life is effectively unlimited, whereas aluminium alloys do not - their curve continues to fall, so a fatigue strength must be quoted at a stated number of cycles. Statement 3 is wrong: the cycle count spans several decades and is always plotted logarithmically.
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