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Thermal fatigue of a turbine blade arises from

  • A.Chemical attack by the combustion products
  • B.Foreign object damage
  • C.Cyclic stress from heating and cooling
  • D.Steady stress at constant temperature

Answer: C

Each start and shutdown imposes a temperature gradient that the blade must accommodate, and the resulting strain accumulates over many cycles. Engines used on short sectors therefore see far more damage per flying hour than those on long ones.

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