Machine Design
Residual stress in materials

Becomes zero when external load is removed
Is independent of external loads
Is always harmful
Acts when external load is applied

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Open belt drive transmits more power than crossed belt drive
Power transmission does not depend upon open and crossed types of constructions

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Machine Design
The contact ratio is the ratio of

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

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