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Creep in a turbine blade is

  • A.Cracking from repeated thermal cycling
  • B.Slow permanent extension under stress
  • C.Rapid fracture under shock loading
  • D.Surface loss from oxidation

Answer: B

The blade lengthens gradually until it either rubs the casing or ruptures, and the rate depends steeply on both temperature and stress. A modest rise in metal temperature can halve the life, which is why cooling effectiveness is worth so much.

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