Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Shear stress
Compressive stress
Bending stress
Tensile stress

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Machine Design
Coaxing is the procedure of increasing

Metal hardness by surface treatment
Metal resistance to corrosion by coating
Fatigue limit by over-stressing the metal by successively increasing loadings
Metal strength by cycling

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