7.1 INTRODUCTION
A spring is a device, made out of a particular material, which can undergo considerable angular and linear deformations without undergoing permanent distortion. Springs are used to absorb energy due to resilience which could be restored at the time of requirement. The quality of a spring is judged depending on its capacity in storing the greatest amount of energy for a given stress. Stiffness of a spring is defined as the load required to produce unit deflection.
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