engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Strength of Materials Springs Stress Correction Factor
In helical compression spring design formula:
\(K\left ( \frac{8PC}{\pi d^2}\right)\)
where P = load, C = spring index, d = wire diameter, and K = Wahl's factor
The Wahl factor takes into account:
1
the bending stress due to helix of the spring
2
the direct shear and the curvature of the spring
3
the elastic constants (modulus of rigidity and Poisson's ratio) of the spring
4
the effect of the inactive number of coils at the ends of the spring