Machine Design
Form coefficient of spring is

Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Concerned with strength of wire of spring

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Acceleration/retardation of masses plus stress due to bending
Bending plus stress due to acceleration/retardation
Axial load plus stress due to bending
Axial load plus stress due to acceleration/retardation

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Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is more stretched than the outer side during the manufacturing process
It is subjected to a higher cyclic loading than the outer side
It is subjected to a higher stress than the outer side
It has a lower curvature than the outer side

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