OS11(5)-20(OS11W0081) Optimum Deformation Value of Notched Eutectoid Steel by Roller Working
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概要
- 論文の詳細を見る
Based on the statistical analysis, more than 90% of failure of machines and mechanical parts are directly or indirectly caused by fatigue and nearly 90% of the fatigue cracks are initiated at stress concentrated part. How to improve the fatigue strength of the stress concentrated part is a serious subject in engineering. As one of the effective and low cost surface modifications, roller working has been used widely to improve the fatigue property of bar shape component. Systematic researches of the effect of roller working have been performed in our laboratory using structural carbon steels and SUS304,and the fatigue strength has been improved satisfactorily. In this paper, fatigue test has been performed to study the influence of roller working on fatigue properties and determine optimum deformation value by roller working using eutectoid steel. Five kinds of specimens (the deformation value are 0,0.05,0.1,0.15 and 0.25mm, respectively) are used for this fatigue test by keeping the same final shapes and dimensions. According to the fatigue testing result, the resistance against fatigue crack initiation increase with the increase of the plastic deformation value; the residual compress stress generated in the plastic working is one of the main factor for improving fatigue strength and the fatigue limit does not necessarily increase with the increase of deformation value. There exists and optimum value by roller working for improving the fatigue strength. The reason why the fatigue limit changes with the variation in plastic deformation value and why there exists and optimum deformation value is examined by analyzing residual stress, the variation in microstructure and micro-Vickers hardness distribution.
- 一般社団法人日本機械学会の論文
- 2003-09-09
著者
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Nishida S
Faculty Of Science And Engineering Saga University
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SUN Wenxian
Graduate School of Science and Engineering, Saga University
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NISHIDA Shinichi
Faculty of Science and Engineering, Saga University
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HATTORI Nobusuke
Faculty of Science and Engineering, Saga University
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Usui Ichiro
Industrial and Technological Center of Saga
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Sun Wenxian
Graduate School Of Science And Engineering Saga University
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Sun Wenxian
Graduate School Of Science & Engineering Saga University
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Hattori N
Faculty Of Science And Engineering Saga University
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Hattori Nobusuke
Faculty Of Science & Engineering Saga Univ.
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Nishida Shinichi
Faculty Of Science & Engineering Saga Univ.
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