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_______ is the ability of steel to resist stresses that are reversal in nature.

  • Fatigue strength is the ability to resist fracture when the stresses are variable and alternate through a cycle.
  • Fatigue tests are made by subjecting a test specimen to variable loads.
  • Some tests bend the piece alternately in one direction, then in the other.
  • Others apply and remove tensile loads. Still, others make a cycle of tension and compression by rotating a loaded specimen. In most cases, this value is approximately 40-50% of the tensile strength.
  • Fatigue strength is the ability of steel to resist stresses that are a reversal in nature.