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An as-wound helical-coil compression spring with infinite fatigue life is needed to resist a dynamic load...

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Mechanical Engineering

An as-wound helical-coil compression spring with infinitefatigue life is needed to resist a dynamic load that varies from8.0 to 24.0 lbf at 45.0 Hz over a dynamic deflection of 0.3 in.Because of assembly considerations, the solid length of the springcannot be more than 1.2 in. The spring should have squared andground ends and is to be made from peened music wire. Upon closure,use a design factor of 1.2 guarding against yielding and afractional overrun to closure x = 0.15. The fundamental criticalfrequency should be greater than 10 times the frequency of thedynamic load. The springmaker has the following wire sizes instock: 0.059, 0.063, 0.072, 0.075, 0.085, and 0.090 in. Select asuitable spring with a fatigue design factor of 1.9 using theGoodman-Zimmerli fatigue failure criterion. Calculate the cost ofthe wire from which the spring is wound and use it as the figure ofmerit for your selection

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