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Discussion

The Paris law relates

  • A.Mean stress to fatigue strength
  • B.Notch geometry to stress concentration
  • C.Growth per cycle to stress intensity range
  • D.Stress amplitude to cycles to failure

Answer: C

Plotted logarithmically it is a straight line over the mid-range of growth rates, with a slope typically between three and four for metals. Threshold behaviour at low stress intensity and unstable fracture at high stress intensity bound it at either end.

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