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__________ is the slow permanent extension of a blade under sustained stress at high temperature.

  • A.Oxidation
  • B.Erosion
  • C.Creep
  • D.Fatigue

Answer: C

The rate depends steeply on both temperature and stress, halving the life for roughly every fifteen kelvin of metal temperature. That sensitivity is why cooling effectiveness and thermal barrier coatings are worth so much.

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