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Discussion

The Goodman relation is used to

  • A.Calculate the stress intensity factor
  • B.Correct fatigue data for the effect of mean stress
  • C.Predict crack growth rate
  • D.Determine fracture toughness

Answer: B

It draws a straight line between the fatigue strength at zero mean stress and the ultimate tensile strength at zero amplitude. Gerber uses a parabola through the same end points and is less conservative for ductile metals.

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