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A semi-elliptical carriage spring of 1200 mm length withstands a load of 60 kN.......

Question: 

A semi-elliptical carriage spring of 1200 mm length withstands a load of 60 kN with maximum deflection of 90 mm. Assume breadth to thickness ratio as 8. Design the spring if bending stress of spring material is 540 MPa and E = 2 × 105 N/mm2.

Answer: