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Shot Peening is a process of inducing RESIDUAL COMPRESSIVE STRESS on the surface layer of metal parts. As the stream of shot is propelled at the surface of the part an impression is created. These impressions create the Residual Compressive Stresses at and slightly beneath the surface. This process enhances fatigue life and/or stress corrosion that it may be exposed to once in service.
Some of the common applications that benefit from Shot Peening include; springs, gears, shafts and connecting rods and various transmission components.
The chart below illustrates the effects of Residual Compressive Stress on two Shot Peened Springs verses two Non- Shot Peened Springs. The impact of Shot Peening in certain applications increased the life of the springs up to two and one-half times.