Improving the fatigue strength of the elements of a steel belt for CVT by cavitation shotless peening
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The elements of steel belts used for continuously variable transmission (CVT) are subjected to a bending load during operation. The weakest portion of the elements is at the root of the “neck” which works into metallic rings. In order to reduce the stress concentration, the root of the neck is rounded and the shape of element is optimized. Nevertheless, if the fatigue strength of the elements can be improved, the steel belt can be applied to larger engines. Although conventional shot peening is one way of enhancing the fatigue strength, it is very difficult for shot to reach into deep and narrow regions.
Recently, a peening method using the impact produced as cavitation bubbles collapse has been developed [1, 2, 3, 4, 5, 6, 7, 8, 9]. This method is called “cavitation shotless peening (CSP)”, as shot are not required [3, 4, 5, 6, 8]. CSP can peen the surface even through deep narrow cavities, as the bubbles can reach these parts and collapse where peening is required.
In the present...
KeywordsResidual Stress Cavitation Fatigue Strength Fatigue Test Compressive Residual Stress
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