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An occasional tensile overload in a variable-amplitude spectrum typically

  • A.Has no effect on crack growth
  • B.Causes immediate fracture
  • C.Retards growth, via residual compression
  • D.Accelerates subsequent crack growth

Answer: C

The plastic zone left by the overload closes on unloading and puts the crack tip in compression, so the following smaller cycles must first overcome it. Deliberately including such overloads in a test spectrum can therefore give an unconservatively long life.

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