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切欠材の疲労強度に及ぼす予加工の影響


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Title: 切欠材の疲労強度に及ぼす予加工の影響
Other Titles: Effect of Pre-strain on the Fatigue Strength of Notched Specimens
Authors: 真武, 友一 / 藤村, 顕世
Authors (alternative): Matake, Tomokazu / Fujimura, Kensei
Issue Date: Dec-1971
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, (2), pp.1-7; 1971
Abstract: Many researches are reported on the fatigue strength of unnotched specimens pre-strained. By their results, the fatigue limit of the pre-strained materials generally increase with increasing of the amount of pre-strain, but it is lower than that of the original when the pre-strain is small. While there are few investigations on the fatigue of notched specimens pre-strained. This paper is the results of experiment on the fatigue strength of the notched steel specimens having semi-circular groove of O.54 mm radius,for which the tensile pre-strain and then the fatigue test by direct stress are conducted. And they are different from those of the previous investigations on the fatigue strength of the pre-strained unnotched materials. That is,the fatigue limit rises with the increasing of the amount of pre-stratin,even when the pre-strain is small. This pheomenon is made clear from the results of the measurement of micro-hardness on the cross section and the observation on the surface of the notch root,as following:the state of the notch root under small pre-strain corresponds to the large pre-strain of the unnotched specimen.
URI: http://hdl.handle.net/10069/23754
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No.2

Citable URI : http://hdl.handle.net/10069/23754

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