Machine Design
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

Completely reversed load
Static as well as dynamic load
Static load
Dynamic load

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Machine Design
Spring stiffness is

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

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