Creep strength of Mod.9Cr1Mo steel under biaxial stress states
This paper describes the development of tension, torsion, and combined tension-torsion creep testing machine with hydro static thrust bearing, criterion on creep rupture strength under biaxial stress states was examined. Tension, torsion, and combined tension-torsion creep tests were carried out at...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2014-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/80/814/80_2014smm0146/_pdf/-char/en |
| _version_ | 1811224907779932160 |
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| author | Naomi HAMADA Masahiro MARUYAMA Hiroshi UMEDA |
| author_facet | Naomi HAMADA Masahiro MARUYAMA Hiroshi UMEDA |
| author_sort | Naomi HAMADA |
| collection | DOAJ |
| description | This paper describes the development of tension, torsion, and combined tension-torsion creep testing machine with hydro static thrust bearing, criterion on creep rupture strength under biaxial stress states was examined. Tension, torsion, and combined tension-torsion creep tests were carried out at 873 K in air employing the developed creep testing machine and hollow cylindrical specimen of Mod.9Cr1Mo steel. Ratio of rupture time tR/tR* increased with the decreasing principal stress ratio λ at constant Mises' equivalent stress, where tR, and tR* denote rupture times for biaxial and tension creep tests, and λ expresses ratio of minimum principal stress to maximum principal stress. Hayhurst's stress successfully correlated with tension, torsion, and combined tension-torsion loading creep lives but Mises' type equivalent stress and maximum principal stress were inadequate to predict creep lives of Mod.9Cr1Mo steel. Oxide film and micro cracks on specimen surfaces were observed using SEM. Micro cracks and oxide film cracks initiated to the perpendicular direction to maximum principal stress axis for -1≦λ≦0. Main crack grew in direction perpendicular to specimen axis independent on the maximum stress ratio λ. The residual lives under biaxial stress states were estimated using Omega method. The Omega method was able to estimate the residual lives within a factor of 4 under biaxial stress states. |
| first_indexed | 2024-04-12T08:56:49Z |
| format | Article |
| id | doaj.art-20be8d8c53604261ae8ee533180ae085 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T08:56:49Z |
| publishDate | 2014-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-20be8d8c53604261ae8ee533180ae0852022-12-22T03:39:21ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612014-06-0180814SMM0146SMM014610.1299/transjsme.2014smm0146transjsmeCreep strength of Mod.9Cr1Mo steel under biaxial stress statesNaomi HAMADA0Masahiro MARUYAMA1Hiroshi UMEDA2Department of Mechanical Engineering, Hiroshima Kokusai Gakuin UniversityGraduate School of Engineering, Hiroshima-Denki Institute of TechnologyFormerly, Department of Mechanical Engineering, Hiroshima Kokusai Gakuin UniversityThis paper describes the development of tension, torsion, and combined tension-torsion creep testing machine with hydro static thrust bearing, criterion on creep rupture strength under biaxial stress states was examined. Tension, torsion, and combined tension-torsion creep tests were carried out at 873 K in air employing the developed creep testing machine and hollow cylindrical specimen of Mod.9Cr1Mo steel. Ratio of rupture time tR/tR* increased with the decreasing principal stress ratio λ at constant Mises' equivalent stress, where tR, and tR* denote rupture times for biaxial and tension creep tests, and λ expresses ratio of minimum principal stress to maximum principal stress. Hayhurst's stress successfully correlated with tension, torsion, and combined tension-torsion loading creep lives but Mises' type equivalent stress and maximum principal stress were inadequate to predict creep lives of Mod.9Cr1Mo steel. Oxide film and micro cracks on specimen surfaces were observed using SEM. Micro cracks and oxide film cracks initiated to the perpendicular direction to maximum principal stress axis for -1≦λ≦0. Main crack grew in direction perpendicular to specimen axis independent on the maximum stress ratio λ. The residual lives under biaxial stress states were estimated using Omega method. The Omega method was able to estimate the residual lives within a factor of 4 under biaxial stress states.https://www.jstage.jst.go.jp/article/transjsme/80/814/80_2014smm0146/_pdf/-char/encombined stresscreepbiaxial creep machinecrackheat-resistant materiallife predictionresidual life prediction |
| spellingShingle | Naomi HAMADA Masahiro MARUYAMA Hiroshi UMEDA Creep strength of Mod.9Cr1Mo steel under biaxial stress states Nihon Kikai Gakkai ronbunshu combined stress creep biaxial creep machine crack heat-resistant material life prediction residual life prediction |
| title | Creep strength of Mod.9Cr1Mo steel under biaxial stress states |
| title_full | Creep strength of Mod.9Cr1Mo steel under biaxial stress states |
| title_fullStr | Creep strength of Mod.9Cr1Mo steel under biaxial stress states |
| title_full_unstemmed | Creep strength of Mod.9Cr1Mo steel under biaxial stress states |
| title_short | Creep strength of Mod.9Cr1Mo steel under biaxial stress states |
| title_sort | creep strength of mod 9cr1mo steel under biaxial stress states |
| topic | combined stress creep biaxial creep machine crack heat-resistant material life prediction residual life prediction |
| url | https://www.jstage.jst.go.jp/article/transjsme/80/814/80_2014smm0146/_pdf/-char/en |
| work_keys_str_mv | AT naomihamada creepstrengthofmod9cr1mosteelunderbiaxialstressstates AT masahiromaruyama creepstrengthofmod9cr1mosteelunderbiaxialstressstates AT hiroshiumeda creepstrengthofmod9cr1mosteelunderbiaxialstressstates |