Machine Design
Cold working

Has no influence on fatigue strength
Increases the fatigue strength
Alone has no influence on fatigue strength
Decreases the fatigue strength

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at both the centroidal axis and outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member

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Machine Design
Set screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts

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