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Two details have theoretical stress concentration factors of \( 2.5 \) and \( 3.5 \). At equal nominal stress, the fatigue-critical one is

  • A.The detail with the factor of 2.5
  • B.Neither; they are equally critical
  • C.Whichever has the larger cross-section
  • D.The detail with the factor of 3.5

Answer: D

The higher factor produces a higher local stress at the notch root and therefore initiates a crack sooner. Reducing stress concentration, by radiusing corners and easing transitions, is the most direct fatigue improvement available.

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