Machine Design
Plastic flow in ductile materials

Depends on other considerations
Increases the seriousness of static loading stress concentration
Has no effect on it
Lessens the seriousness of static loading stress concentration

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Machine Design
A woodruff key is

Fitted in pairs at right angles
All of these
A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft

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