Machine Design
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

Elasticity
Malleability
Ductility
Plasticity

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its ability to absorb shocks
Its capability of storing energy
Load required to produce unit deflection

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and bending stress in the wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire

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