Herical spring practical

                                     









Experiment : Axial deflection of a close coiled helical springs by loading


Aim           : To determine
                        (a)    The modulus of Rigidity of a  close coiled helical springs
                        (b)    Spring constant ( Stiffness )


Apparatus  : 1. close coiled herical springs
                   2. Loading frame
                   3.dial gauge
                   4.weights
                   5.Vernier caliper


Theory     : When a close coiled helical spring is loaded deflection is given by
                                          δ  = 64 WR²N
                                                    D⁴G
               Where,
                   δ = Axial  deflection due to load          W = Axial load
                  R = Mean radius of the coil                  N = Number of Coils
                  D = Diameter of spring wire                 G = Modulus of Rigidity

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