Abstract
Shot-peening effects on the fatigue life behavior of bearing steel (JIS SUJ2) have been investigated. Hourglass-shaped test specimens were heat-treated and then surface-treated using a shot-peening machine. Results of a rotary bending fatigue test showed that shotpeening suppressed not only much of the surface-originated fracture but also the scattering error of the probabilistic stress-life data, and improved the fatigue life by about 6 times through the load levels of the cyclic tests. Such large increase in fatigue life was driven by the following reasons: The increase of hardness in the skin caused the predicted fatigue limit stress to increase by 15%; fracture-initiating inclusions were distributed at deeper locations, experiencing low nominal stresses; and the increase in the fish-eye fracture size by an average of 180%.
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Recommended by Editor Jai Hak Park
Sang-Jae Yoon received his Master’s degree from the Department of Mechanical Engineering, Hanyang University, Korea, 2011. His research interests are fatigue fracture and material design.
Nak-Sam Choi received his Ph.D. from Kyushu University, Japan, 1990. He is currently a full professor in the Department of Mechanical Engineering, Hanyang University, Korea. His research interests include the fatigue behavior of materials and composites, acoustic emission analysis, experimental methods for composites and reliability analysis.
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Yoon, SJ., Park, JH. & Choi, NS. Fatigue life analysis of shot-peened bearing steel. J Mech Sci Technol 26, 1747–1752 (2012). https://doi.org/10.1007/s12206-012-0340-8
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DOI: https://doi.org/10.1007/s12206-012-0340-8