Fatigue conditions

Many springs, such as valve springs, oscillate rapidly through a considerable range of stress and are consequently operating under conditions requiring a long fatigue life. The suitability of a spring under such conditions must be considered at the drawing-board stage, and a satisfactory design and material must be specified. Special treatments such as shot-peening or liquid-honing may be desirable. In the process of shot-peening, the spring is subjected to bombardment by small particles of steel shot; this has the effect of workhardening the surface. Liquid honing consists of placing the spring in a jet of fine abrasive suspended in water. This has similar effect to shot-peening, and the additional advantage that the abrasive stream removes or reduces stress raisers on the spring surface.

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