An open-coiled helical spring of wire diameter 12 mm, mean coil radius 84 mm, helix angle 2o deg
Carries an axial load of 480 N. Determine the shear stress and direct stress developed at inner
radius of the coil.
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rod, and has 12 complete coils, each of mean diameter 120 mm. compute (a) shear stress induced in the rod, (b) deflection under the pull, and (c) energy stored in the spring during the extension. Take G = 0.85 x 10 5 N/mm 2 . Solution: Given: d = 16 mm; n =12; R = 120/2 = 60 mm; W = 600 N T=W.R=600×60=36000 N-mm Open-Coiled Helical Spring: Axial Force Let the centre line of each coil be inclined at an angle α with the horizontal axis. Let R = mean radius of each coil; d = diameter of the wire; n
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