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Linear elastic fracture mechanics characterises the crack tip by

  • A.The nominal applied stress alone
  • B.The material's yield stress
  • C.The crack length alone
  • D.The stress intensity factor

Answer: D

The stress intensity factor combines the applied stress, the crack length and a geometry factor into a single parameter that governs the crack tip field. Two different cracked bodies with the same value behave identically at the tip.

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