Machine Design
Residual stress in materials

Is independent of external loads
Is always harmful
Acts when external load is applied
Becomes zero when external load is removed

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Machine Design
Which is correct statement?

Which one is rigid will depend on several other factors
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
Both will be equally rigid
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel

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

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