Problem

A torsional helical spring for a 30-in. door (see Fig. 1) is to have a pull at the handle...

A torsional helical spring for a 30-in. door (see Fig. 1) is to have a pull at the handle of 1 lb when the door is closed, and a pull of 3 lb after the door has rotated through 180°. No. 6 wire is to be used, and maximum stress is 150,000 psi. Find the required diameter of the helix, the required initial angular deformation, and the number of active coils in the spring. Take into account the stress concentration.

Figure 1

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