A compression spring is to be made of 0.25 in music wire, for which the shear st

Question

A compression spring is to be made of 0.25 in music wire, for which the shear stiffness G is 11.4 Msi, and shear yield stress S%y is 109 ksi. It is to have closed and ground ends (i.e. 2 end coils). The coil's outer diameter will be 2.25 in, and its free length is to be 6 in, but it may have differing numbers of coils. It is proposed to make springs with 9. 10,11. or 12 coils. The spring is to have a safety factor against yield of at least 1.2 when compressed solid. Using Eq. 10-7, which number of coils will lead to a satisfactory spring? Only 12 coils has a yield safety factor geeater than 1.2 Only 12 and 11 coils have yield safety factors geeater than 1.2 Only 12, 11, and 10 coils have yield safety factors geeater than 1.2 All of them have yield safety factors geeater than 1.2 None of the above

Explanation / Answer

option C

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