Question: The spring in Prob. 103 is to be used with a static load of 130 N. Perform a design assessment represented by Eqs. (1013) and

The spring in Prob. 10–3 is to be used with a static load of 130 N. Perform a design assessment represented by Eqs. (10–13) and (10–18) through (10–21) if the spring is closed to solid height.
In Prob. 10–3, A helical compression spring is wound using 2.5-mm-diameter music wire. The spring has an outside diameter of 31 mm with plain ground ends, and 14 total coils.
(a) What should the free length be to ensure that when the spring is compressed solid the torsional stress does not exceed the yield strength, that is, that it is solid-safe?
(b) What force is needed to compress this spring to closure?
(c) Estimate the spring rate.
(d) Is there a possibility that the spring might buckle in service?

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