OS11(5)-19(OS11W0080) The Effect of Compressive Mean Stress on Fatigue Properties of Notched Structural Steel
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概要
- 論文の詳細を見る
After investigating 242 cases of many kinds of mechanical parts, one of the authors stated that more than 90% of failures of machines and mechanical parts are directly or indirectly caused by fatigue and nearly 90% of the fractures are initiated at stress-concentrated parts. Therefore research related to fatigue strength improvement especially at stress-concentrated parts would be more and more important in viewpoint of safety of structural components. The authors have investigated not only the effect of compressive mean stress on fatigue properties of non-roller-worked specimen but also the effect of compressive residual stress on fatigue properties of plastic deformed specimens by roller-working. Two types of specimens were used in the tensile-compressive fatigue test, i.e. a non-roller-worked specimen and a roller-worked one. The non-roller-worked specimen consisted of notched specimen, and was made to final finishing shape and dimensions only by machining. The compressive mean stress applied to the non-roller-worked specimen are specified at 0,25,50 and 75% ratio of yield stress. As far as the roller-worked specimen, the surface layer of the roller-worked specimens were plastically deformed 0.5 and 1mm by roller-working after machining. The main results obtained in the present study are as follows; (1) According to increase of the compressive mean stress from 0,-61.25,-122.5 and -183.75 MPa, the fatigue limits of these specimens also increase to 255,282.5,388,and 425 MPa respectively. (2) The fatigue limit of 1mm deformed specimen is 490 MPa, which is higher than that of non-roller-worked specimen by 192%. The above difference would be caused by compressive residual stress and work-hardening due to roller working. (3) According to the above results, the compressive mean stress and compressive residual stress suppress remarkably the transition from crack initiation to propagation.
- 2003-09-09
著者
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Priyo Tri
Graduate School Of Science And Engineering Saga Univ.
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Nishida S
Faculty 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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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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