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Miner's rule states that failure occurs when

  • A.The sum of the cycle ratios for each stress level reaches one
  • B.The largest applied stress reaches the ultimate strength
  • C.Any single stress level is applied a million times
  • D.The mean stress reaches yield

Answer: A

Each block of cycles contributes damage equal to the cycles applied divided by the cycles to failure at that level, and failure is predicted when the accumulated damage reaches unity. It ignores sequence effects entirely, which is its main weakness.

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