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The stress intensity factor is proportional to

  • A.Stress times the root of crack length
  • B.The applied stress times the crack length
  • C.The square of the applied stress
  • D.The crack length alone

Answer: A

The square root dependence means a crack must grow fourfold to double the stress intensity, which is why crack growth accelerates so sharply towards the end of life. A geometry factor accounts for the specimen and crack configuration.

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