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The principal limitation of Miner's rule is that it

  • A.Applies only to steels
  • B.Ignores the order in which the load blocks are applied
  • C.Cannot handle more than two stress levels
  • D.Requires a fracture mechanics analysis first

Answer: B

A large cycle followed by small ones behaves differently from the reverse order, because an overload leaves a compressive residual stress at the crack tip that retards subsequent growth. Miner's linear summation cannot represent that.

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