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The fatigue notch factor is usually

  • A.Larger than the theoretical factor
  • B.Exactly equal to the theoretical factor
  • C.Always equal to one
  • D.Smaller than the theoretical factor

Answer: D

Local plasticity and the stress gradient at the notch root mean the material does not feel the full elastic peak. Notch sensitivity, which runs from zero to one, relates the two, and it rises with material strength and with notch root radius.

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