Machine Design
Cold working

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

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia

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