Machine Design
Cold working

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

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