Machine Design
Plastic flow in ductile materials

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

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Machine Design
The contact ratio is the ratio of

Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch

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