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Spring index is-

This question was previously asked in
NPCIL ST ME (07/11/2019, Shift-2)
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  1. Ratio of coil diameter to wire diameter
  2. Load required to produce unit deflection
  3. Its capability of storing energy
  4. Indication of quality of spring

Answer (Detailed Solution Below)

Option 1 : Ratio of coil diameter to wire diameter
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Detailed Solution

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Concept:

The spring index is defined as the ratio of the mean diameter of the coil to the diameter of the wire. Mathematically,

Spring index,

Deflection of Helical Springs of Circular Wire:

Stiffness of the spring or spring rate

Where D = Mean diameter of the spring coil, d = Diameter of the spring wire, n = Number of active coils, G = Modulus of rigidity for the spring material, W = Axial load on the spring

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Q1.A Wahl's stress factor (Ks) is: (where C spring index)
Q2.Shear stress distribution on the cross-section of the coil wire in a helical compression spring is shown in the figure. This shear stress distribution represents
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