The figure shows a conical compression helical coil spring where R1 and R2 are the initial and

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The figure shows a conical compression helical coil spring where R1 and R2 are the initial and final coil radii, respectively, d is the diameter of the wire, and Na is the total number of active coils. The wire cross section primarily transmits a torsional moment, which changes with the coil radius. Let the coil radius be given by
R = R1 + R2 ˆ’ R1/2Ï€Naθ

The figure shows a conical compression helical coil spring where

Where θ is in radians. Use Castigliano€™s method to estimate the spring rateas

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Shigleys Mechanical Engineering Design

ISBN: 978-1121345317

9th edition

Authors: Richard G. Budynas, J. Keith Nisbett

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