Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and bending stress in the wire

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Equally serious in both types of materials
Very serious in brittle materials and less serious in ductile materials
Seriousness would depend on other factors
Very serious in ductile materials and less serious in brittle materials

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