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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

1. direct shear stress in the coil wire cross-section
2. torsional shear stress in the coil wire cross-section
3. combined direct shear and torsional shear stress in the coil wire cross-section
4. combined direct shear and torsional shear stress with stress concentration at inside edge of the coil wire cross-section

Correct answer: combined direct shear and torsional shear stress with stress concentration at inside edge of the coil wire cross-section

Solution

The correct option indicates that both direct shear and torsional shear stresses are present in the coil wire, particularly highlighting the stress concentration at the inside edge, which is typical in helical springs due to their geometry and loading conditions.

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