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Question

When an open
coiled helical compression spring is subjected to an axial compressive
load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)


Options:
A .  `(W.D)/(pi d^3) xx K`
B .  `(2W.D)/(pi d^3) xx K`
C .  `(4W.D)/(pi d^3) xx K`
D .  `(8W.D)/(pi d^3) xx K`
Answer: Option D



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