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In a closed coiled helical spring, the maximum shear stress occurs on the
  • a)
    Mean diameter fibre
  • b)
    Innermost fibre
  • c)
    Outermost fibre
  • d)
    Shear stress will be same every where
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a closed coiled helical spring, the maximum shear stress occurs on ...
The major stresses in a helical spring are of two types, shear stress due to torsion and direct shear due to applied load. It is observed that for both tensile load as well as compressive load on the spring, maximum shear stress always occurs at the inner side of the spring. Hence, failure of the spring, in the form of crake, is always initiated from the inner radius of the spring.
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In a closed coiled helical spring, the maximum shear stress occurs on ...
Explanation:

When a helical spring is subjected to axial loading, the coils are compressed and the spring is subjected to shear stresses. The maximum shear stress occurs at the innermost fibres of the spring.

Reasons for maximum shear stress to occur on innermost fibre:

1. Smaller Radius:

The innermost fibre of the spring has a smaller radius compared to the outermost fibre. As the radius decreases, the shear stress increases.

2. Maximum deformation:

The innermost fibre of the spring undergoes maximum deformation due to the axial loading. This results in a higher shear stress as the shear stress is directly proportional to the deformation.

3. Shear strain:

The shear strain is higher for the innermost fibre, which leads to a higher shear stress. This is because the shear strain is directly proportional to the radius of the fibre.

Conclusion:

Therefore, it can be concluded that the maximum shear stress occurs at the innermost fibre of the closed coiled helical spring.
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In a closed coiled helical spring, the maximum shear stress occurs on thea)Mean diameter fibreb)Innermost fibrec)Outermost fibred)Shear stress will be same every whereCorrect answer is option 'B'. Can you explain this answer?
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