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Increasing the mean stress at constant stress amplitude generally

  • A.Reduces fatigue life
  • B.Increases fatigue life
  • C.Has no effect on fatigue life
  • D.Eliminates fatigue entirely

Answer: A

Correct answer: Reduces fatigue life

A tensile mean stress holds the crack open through more of the cycle, so a larger part of the cycle contributes to growth. The Goodman and Gerber relations quantify the effect, converting a cycle at some mean stress into an equivalent fully reversed one so that ordinary S-N data may be used.

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