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An S-N curve plots

  • A.Stress intensity against crack growth rate
  • B.Stress amplitude against cycles to failure
  • C.Stress against strain
  • D.Crack length against cycles

Answer: B

The curve is obtained from constant-amplitude testing and falls steeply at first before flattening. It is the basic input to any stress-life fatigue calculation, and the number of cycles is conventionally plotted on a logarithmic scale.

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