It is required to design a helical torsion spring for a window-shade. The and Cold-drawn steel wire of Graele 4. The yield strength of the material is Gol. of the ultimate tensile strength, and the...

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Extracted text: It is required to design a helical torsion spring for a window-shade. The and Cold-drawn steel wire of Graele 4. The yield strength of the material is Gol. of the ultimate tensile strength, and the factor of Safety is 2. mean coil diameter is kept nding moment acting on the spring is esoNemm. The modulng of elas ticity of the kNlmm?). The stiffness of the rad). Determine the wire didmeter and the number of active Cils. Also, detesmine the deflectnon and stored stain.energy. spring is made of patented from space Considerations, the as 18 mm. The maximum be- moterial is (207 spring shiuld be(3 N-mm) spring