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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
- decreased
- increased or decreased, depending on the external bending load
- neither decreased nor increased
- increased
Correct answer: increased
Solution
Residual compressive stress on the outer surface of a rotating shaft counteracts the tensile stresses that occur during bending, which enhances the fatigue resistance of the material and ultimately increases the fatigue life.
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