Academics – Applied Mechanics : 2021/JUL/08
Question
Q8) A close coiled helical spring consists of 24 coils of tubular steel. The mean diameter of the coils is 75 mm, external diameter of the tube is 12.5 mm and its thickness is 2.5 mm. The shear stress in the material is linited to 70 N/mm2.
Calculate EACH of the following :
(a) Maximum axial load the spring can carry; (10)
(b) Deflection under this load. (6)
Modulus of rigidity for spring material = 90 GN/m2.
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