| 1. |
Tomography for Bridging Nano and Macro: Semi-spontaneous Iinterfacial Debonding.  |
| 2. |
H. Toda, K. Shimizu, H. Gao, K. Hirayama, 4D Hydrogen Embrittlement Behaviour In High Strength Aluminium Alloy, 14th International Conference on Fracture 2017 (ICF-14), Vol.2, pp.1697-1698, 2017.06. |
| 3. |
H. Su, H. Toda, R. Masunaga, K. Uesugi, A. Takeuchi, Y. Watanabe, Hydrogen induced strain localization in Al-Zn-Mg-Cu aluminum alloys, 14th International Conference on Fracture 2017 (ICF-14), Vol.2, pp.1679-1680, 2017.06. |
| 4. |
シンクロトロン放射光を用いた3D/4Dイメージングの現状. |
| 5. |
OS0802-137 3D image-based analysis of damage initiation and microstructures in aluminium alloy. |
| 6. |
H. Toda, D. Seo, M. Kobayashi, A. Hosokawa, Assessment of ductile fracture via 3D/4D image-based approaches, Proceedings of The 4th International Symposium on Steel Science - ISSS 2014, Vol.-, No.-, pp.32-41, 2014.11. |
| 7. |
OS1201 Finite element analysis of ductile fracture via hydrogen pore mechanism in an aluminium alloy. |
| 8. |
H. Toda, E. Maire, Y. Aoki, M. Kobayashi, Three-dimensional strain mapping using in-situ X-ray synchrotron microtomography, The Journal of Strain Analysis for Engineering Design, Vol.46, No.7, pp.549-561, 2011.07. |
| 9. |
Development of microstructural features tracking method for high-precise 3-D strain measurement by X-ray CT. |
| 10. |
Influence of micro pore on ductile fracture of aluminum alloys. |
| 11. |
Three-dimensional elemental mappings of zinc and copper in aluminum alloys. |
| 12. |
ドルチェ ユネルサム, 戸田 裕之, 小林 正和, 小林 俊郎, 堀川 宏, 鈴木 聡, アルミニウム鋳物合金のポアと力学的性質の関係, 軽金属学会第113回秋期大会講演概要, pp.123-124, 2007.10. |
| 13. |
Thermal fatigue property of a peening-treated aluminum casting alloy. |
| 14. |
Improvement of mechanical property of Al-Mg-Si alloys by two rapid heating step aging. |
| 15. |
Investigation on concentration of hydrogen trapped in micro pores in an aluminum alloy. |
| 16. |
Microstructure evolution and mechanical property of aluminum alloy by high-temperature solution treatment. |
| 17. |
Precipitate orientation in an aluminum casting alloy during a thermo-mechanical loading. |
| 18. |
3-D Visualization of Grain Deformation in Aluminum alloy by Tracking Particles on Grain Boundary. |
| 19. |
Analysis of the fracture process of a pre-cracked cast Al alloy according to the three-dimensional CTOD distribution. |
| 20. |
Observation of Si particles in cast aluminum alloys by deflection contrast imaging. |
| 21. |
銭 立和, 戸田 裕之, 上杉 健太朗, OHGAKI Tomoi, 小林 正和, 小林 俊郎, 放射光CT画像を用いにアルミニウム合金鋳物の破壊挙動のイメージベース解析, 軽金属学会第111回秋期大会 講演概要, pp.11-12, 2006.10. |
| 22. |
3D visualization of aging precipitates by X-ray imaging microtomography with zone plate. |
| 23. |
Visualization of crack opening and propagation of aluminium alloy casting by synchrotoron radiation CT. |
| 24. |
3-D visualization of the crystal grain deformation by tracking of the particle on the grain boundary. |
| 25. |
In-situ high-resolution X-ray CT observations of compressive and damage behaviour of aluminium foams by local tomography. |
| 26. |
3D visualization of crack growth in an AC4CH cast aluminum alloy by synchrotron X-ray CT. |
| 27. |
High-resolution visualization and analysis of fatigue-cracked 6061 aluminium alloy by synchrotoron CT. |
| 28. |
3D Visualization of Grain Boundaries in Aluminum Alloys by High-Resolution X-Ray CT. |
| 29. |
H Toda, Sinclair, I, JY Buffiere, E Maire, T Connolley, M Joyce, KH Khor, P Gregson, Assessment of the fatigue crack closure phenomenon in damage-tolerant aluminium alloy by in-situ high-resolution synchrotron X-ray microtomography, PHILOSOPHICAL MAGAZINE, 10.1080/147864303100015754, Vol.83, No.21, pp.2429-2448, 2003.07, Synchrotron X-ray microtomography has been utilized for the in-situ observation of steady-state plane-strain fatigue crack growth. A high-resolution experimental configuration and phase contrast imaging technique have enabled the reconstruction of crack images with an isotropic voxel with a 0.7 mum edge. The details of a crack are readily observed, together with evidence of the incidence and mechanical influence of closure. After preliminary investigations of the achievable accuracy and reproducibility, a variety of measurement methods are used to quantify crack-opening displacement (COD) and closure from the tomography data. Utilization of the physical displacements of microstructural features is proposed to obtain detailed COD data, and its feasibility is confirmed. Loss of fracture surface contact occurs gradually up to the maximum load. This is significantly different from tendencies reported where a single definable opening level is essentially assumed to exist. The closure behaviour is found to be attributable mainly to pronounced generation of mode III displacement which may be caused by local crack topology. Many small points of closure still remain near the crack tip, suggesting that the near-tip contact induces crack growth resistance. The effects of overloading are also discussed.. |
| 30. |
VA Mosneaga, T Mizutani, T Kobayashi, H Toda, Experimental and analytical investigations of fracture toughness in weldments of 6082 Al alloy, MATERIALS TRANSACTIONS, Vol.42, No.11, pp.2386-2391, 2001.11, 6082 At alloys are commercial and medium strength alloys, widely used as materials for welded structures. The purpose of this study is to investigate the effects of Mn addition on toughness of welded Al-Mg-Si alloys. To evaluate microstructural effects quantitatively, in-situ SEM observations of crack initiation and propagation behaviors through weldment are carried out. For the consideration of in-situ observation of fracture toughness test, stress field at crack-tip is analyzed using elasto-plastic finite element method (Hereinafter, FEM.) assuming that a crack is near a boundary between a weld metal and heat affected zone (Hereinafter, HAZ.). When small amount of Mn is added, recrystallization is completely suppressed as compared to specimens to which no Mn is added, thereby fibrous grains are kept. On the other hand, recrystallization of HAZ causes drastic decrease in fracture toughness in the case of no Mn addition. With the extension of a main crack, many microcracks are formed at grain boundaries ahead of a crack-tip despite the fact that the stress is relatively low. Such microcracking is not attributed to so-called liquation cracks, but the degradation is caused by the formation of film like Al-Mg intermetallic compuonds at grain boundaries. The microcracks are aligned ahead of the crack-tip at an angle of 60 degrees from an initial notch direction, This is attributable to the experimentally-observed direction of the intermetallic compound film, which is also confirmed by the numerical analysis.. |
| 31. |
T. Kobayashi, H. Toda, Fracture in complex microstructures, Materials Transactions, Vol.42, No.1, pp.90-99, 2001.01. |
| 32. |
T. Kobayashi, S. Morita, H. Toda, Fracture toughness evaluation and specimen size effect, Materials Transactions, Vol.42, No.1, pp.52-57, 2001.01. |
| 33. |
T. Kobayashi, H. Toda, Fracture and toughness of MMCs, Proceedings of the 10th IKETANI Conference on Materials Research toward the 21st Century, pp.303-304, 2000.08. |
| 34. |
H. Toda, Porous composites reinforced by particles, Proceedings of Oxford Kobe Materials Seminar on Metal and Ceramic Composites, pp.192-199, 2000.08. |
| 35. |
T. Kobayashi, N. Inoue, S. Morita, H. Toda, On the accuracy of measurement and calibration of load signal in the instrumented Charpy impact test, ASTM-STP 1380, ASTM, PA, pp.198-209, 2000.03. |
| 36. |
L Wang, T Kobayashi, H Toda, M Hayakawa, Effects of loading velocity on fracture toughness of a SiCw/A6061 composite at elevated temperatures, MATERIALS TRANSACTIONS JIM, 10.2320/matertrans1989.40.1056, Vol.40, No.10, pp.1056-1062, 1999.10, The influence of loading velocity on the fracture toughness of a SiC whisker reinforced 6061 aluminum alloy composite was investigated at elevated temperatures. A precracked three-point bend specimen configuration was selected for fracture toughness measurement, with tests being conducted at loading velocities of 10(-2) to 10 m.s(-1), and at temperatures up to 473 K. The results showed that the fracture toughness increases with increasing loading velocity, but the difference with respect to room temperature is small, because the fracture toughness decreases slowly with increasing testing temperature. The composite material failed mainly by whisker pull-out and whisker breaking.. |
