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Detection of small internal fatigue cracks in Ti-6Al-4V via synchrotron radiation nanocomputed tomography
| Title: | Detection of small internal fatigue cracks in Ti-6Al-4V via synchrotron radiation nanocomputed tomography |
| Authors: | Xue, Gaoge Browse this author | | Tomoda, Yuta Browse this author | | Nakamura, Takashi Browse this author →KAKEN DB | | Fujimura, Nao Browse this author →KAKEN DB | | Takahashi, Kosuke Browse this author | | Yoshinaka, Fumiyoshi Browse this author | | Takeuchi, Akihisa Browse this author | | Uesugi, Masayuki Browse this author | | Uesugi, Kentaro Browse this author |
| Issue Date: | Sep-2022 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Fatigue and fracture of engineering materials and structures |
| Volume: | 45 |
| Issue: | 9 |
| Start Page: | 2693 |
| End Page: | 2702 |
| Publisher DOI: | 10.1111/ffe.13765 |
| Abstract: | Two types of synchrotron radiation computed tomography (SR-CT)-projection CT (micro-CT) and phase-contrast imaging CT (nano-CT)-were used to observe internal fatigue cracks in (alpha + beta) Ti-6Al-4V alloy. Micro-CT detected cracks in the specimen at similar to 1 mu m spatial resolution, and the nano-CT provided magnified images at similar to 200 nm spatial resolution. The crack initiation sites were clarified as the alpha-phase for both the surface and internal cracks; however, their opening behaviors differed. A sharp crack tip was observed in the surface crack, and the crack tip opening displacement (CTOD) increased with an increase in the applied load. By contrast, a blunted crack tip, similar to that of a crack in a vacuum, was observed for the internal crack, and its CTOD remained almost constant regardless of the applied load. These phenomena are likely to explain the different behaviors of surface and internal cracks, particularly the slower growth rate of internal cracks, which leads to a longer fatigue life in the very high cycle fatigue regime. |
| Rights: | This is the peer reviewed version of the following article: Xue, G, Tomoda, Y, Nakamura, T, et al. Detection of small internal fatigue cracks in Ti-6Al-4V via synchrotron radiation nanocomputed tomography. Fatigue Fract Eng Mater Struct. 2022; 45(9): 2693-2702, which has been published in final form at https://doi.org/10.1111/ffe.13765. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/90221 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 中村 孝
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