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Fracture toughness is

  • A.The crack growth rate at a given stress intensity
  • B.The critical stress intensity for fracture
  • C.The stress at which the material yields
  • D.The energy absorbed in a tensile test

Answer: B

It is a material property with units of stress times the square root of length, and it sets the critical crack size for a given applied stress. High-strength alloys typically have lower toughness, which is a central trade in damage-tolerant design.

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