Multiple choice

An axial residual compressive stress due to a manufacturing process is present on the outer surface of a rotating shaft subjected to bending. Under a given bending load, the fatigue life of the shaft in the presence of the residual compressive stress is

  1. decreased

  2. increased or decreased, depending on the external bending load

  3. neither decreased nor increased

  4. increased
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D Correct answer
Explanation

$\text{life of the shaft in the presence of the residual compressive stress.The fatigue life of the material is effectively increased by the introduction of a compressive mean stress, whether applied or residual}$

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