Fatigue life is expected to increase by

1.	Fatigue life is expected to increase by
A.	increasing the size of the sample.
B.	smooth polishing of the surface of the sample.
C.	having compressive residual stresses at the surface.
D.	having tensile residual stresses at the surface.
Answer» D. having tensile residual stresses at the surface.

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Fatigue life is expected to increase by

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