Improvement of Omega Method for Creep Life Prediction
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概要
- 論文の詳細を見る
Omega method has been proposed for predicting rupture life from creep strain ε-time t data. The method is based on a linear relation between logarithm of creep rate ε and strain, namely a creep curve without the primary and secondary creep stages. Such a linear relation, however, seldom holds in real creep data. In this paper, the original equation is modified to the following form:ε =ε0+Ω<SUP><U>1</U></SUP> {ln (1+ζt)-ln (1-ηt)}where ε0, Ω, ζ and η are parameters characterizing a creep curve. The first and second terms in the parentheses describe primary creep and tertiary creep, respectively. The equation is applied to ferritic steels. The four parameters of the equation can uniquely be determined for a creep curve with a curved ln ε-ε relation. The equation can well reproduce creep curves with a prominent primary creep stage. Because of the high reproducibility, the modified equation can predict rupture life with higher accuracy at an earlier stage of creep than the original equation.
- 社団法人 日本鉄鋼協会の論文
- 1997-04-15
著者
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SATO Hiroyuki
Department of Hematology/Oncology, The Institute of Medical Science, The University of Tokyo
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Koike Jun-ichi
Department Of Materials Science Graduate School Of Engineering Tohoku University
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MARUYAMA Kouichi
Department of Environmental Studies, Graduate School of Environmental Studies, Tohoku University
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Nonaka Isamu
Research Laboratory Ishikawajima-harima Heavy Industries Co. Ltd.
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Nonaka Isamu
Research Institute Ishikawajima-harima Heavy Industries Co. Ltd.
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SAWADA Kota
National Research Institute for Metals
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Sawada Kota
Materials Reliability Center National Institute For Materials Science
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Umaki Hideo
Power Plant Division Ishikawajima-harima Heavy Industries Co. Ltd.
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SAWADA Kota
Department of Materials Science, Faculty of Engineering, Tohoku University
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Sato H
Tohoku Univ. Miyagi‐ken Jpn
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Maruyama Kouichi
Department Of Anesthesiology Saitama International Medical Center Saitama Medical University
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Maruyama Kouichi
Department Of Materials Science Graduate School Of Engineering Tohoku University
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Sato Hiroyuki
Department Of Biomolecular Science Fac.sci. Toho Univ.
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Sato Hiroyuki
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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