Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging
The initiation and growth of internal small fatigue cracks with around ten or several dozen μm in Ti-6Al-4V were nondestructively examined by using synchrotron radiation μCT at the large synchrotron radiation facility SPring-8. Lots of grain-sized internal cracks were observed roughly evenly in the...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2017-11-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00104/_pdf/-char/en |
| _version_ | 1811317820686860288 |
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| author | Fumiyoshi YOSHINAKA Takashi NAKAMURA Kazuaki TAKAKU Daiki SHIOZAWA Yoshikazu NAKAI Kentaro UESUGI |
| author_facet | Fumiyoshi YOSHINAKA Takashi NAKAMURA Kazuaki TAKAKU Daiki SHIOZAWA Yoshikazu NAKAI Kentaro UESUGI |
| author_sort | Fumiyoshi YOSHINAKA |
| collection | DOAJ |
| description | The initiation and growth of internal small fatigue cracks with around ten or several dozen μm in Ti-6Al-4V were nondestructively examined by using synchrotron radiation μCT at the large synchrotron radiation facility SPring-8. Lots of grain-sized internal cracks were observed roughly evenly in the observation volume in the specimen; in contrast, only one surface crack was detected. The initiation lives of the internal cracks were widely different for each crack and had no significant correlation with the crack initiation site nor the initial crack size. The internal cracks propagated microstructure-sensitively with several crack deflections, and the growth rates were very small, less than 10-10 m/cycle. The crack growth rates just after facet formations showed large variability and had no apparent relationship with the crack initiation life nor the initial crack size. This variability can likely be attributed to microstructural inhomogeneities around the crack initiation facets. The estimated facet formation rate indicated that most facets formed rapidly compared with the following internal crack growth rate. |
| first_indexed | 2024-04-13T12:15:02Z |
| format | Article |
| id | doaj.art-6bde10b9d449457a900252cbae3694f9 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-13T12:15:02Z |
| publishDate | 2017-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-6bde10b9d449457a900252cbae3694f92022-12-22T02:47:23ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-11-018385617-0010417-0010410.1299/transjsme.17-00104transjsmeObservation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imagingFumiyoshi YOSHINAKA0Takashi NAKAMURA1Kazuaki TAKAKU2Daiki SHIOZAWA3Yoshikazu NAKAI4Kentaro UESUGI5Division of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido UniversityDivision of Mechanical and Space Engineering, Faculty of Engineering, Hokkaido UniversityDivision of Mechanical and Space Engineering, Graduate School of Engineering, Hokkaido UniversityDepartment of Mechanical Engineering, Kobe UniversityDepartment of Mechanical Engineering, Kobe UniversityJapan Synchrotron Radiation Research InstituteThe initiation and growth of internal small fatigue cracks with around ten or several dozen μm in Ti-6Al-4V were nondestructively examined by using synchrotron radiation μCT at the large synchrotron radiation facility SPring-8. Lots of grain-sized internal cracks were observed roughly evenly in the observation volume in the specimen; in contrast, only one surface crack was detected. The initiation lives of the internal cracks were widely different for each crack and had no significant correlation with the crack initiation site nor the initial crack size. The internal cracks propagated microstructure-sensitively with several crack deflections, and the growth rates were very small, less than 10-10 m/cycle. The crack growth rates just after facet formations showed large variability and had no apparent relationship with the crack initiation life nor the initial crack size. This variability can likely be attributed to microstructural inhomogeneities around the crack initiation facets. The estimated facet formation rate indicated that most facets formed rapidly compared with the following internal crack growth rate.https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00104/_pdf/-char/engigacycle fatiguefatigue crack initiationfatigue crack growthnon-destructive inspectionsynchrotron radiation |
| spellingShingle | Fumiyoshi YOSHINAKA Takashi NAKAMURA Kazuaki TAKAKU Daiki SHIOZAWA Yoshikazu NAKAI Kentaro UESUGI Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging Nihon Kikai Gakkai ronbunshu gigacycle fatigue fatigue crack initiation fatigue crack growth non-destructive inspection synchrotron radiation |
| title | Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging |
| title_full | Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging |
| title_fullStr | Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging |
| title_full_unstemmed | Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging |
| title_short | Observation of the initial process of internal fracture in very high cycle fatigue in Ti-6Al-4V by synchrotron radiation μCT imaging |
| title_sort | observation of the initial process of internal fracture in very high cycle fatigue in ti 6al 4v by synchrotron radiation μct imaging |
| topic | gigacycle fatigue fatigue crack initiation fatigue crack growth non-destructive inspection synchrotron radiation |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/856/83_17-00104/_pdf/-char/en |
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