| Masaki Tanaka | Last modified date：2024.04.20 |
Professor /
Metals Science for Structural Materials /
Department of Materials Science and Engineering /
Faculty of Engineering
Reports
| 1. | 鉄鋼材料中の転位組織の電子線トモグラフィー観察. |
| 2. | Modeling and crystal plasticity finite element analysis of elastoplastic deformation in the polycrystal model of α-Ti alloys. |
| 3. | Development of a EBSD-FEM data conversion interface and the image-based crystal plasticity analysis <p>Image-based deformation simulation of microstructures in metals is attracting attention; however, the data conversion processes from the images of microstructures into the geometric models for the deformation simulation are now inconvenient, and there is a possibility that it prevents diffusion of the image-based simulation. In order to solve the problem, we developed an interface to convert the data of crystal orientation maps obtained by Electron Back-Scatter Diffraction (EBSD) patterns into that of geometric models for Crystal Plasticity Finite Element (CPFE) analysis. The interface incorporates several functions for data cleaning and coarse graining of the microstructures: functions to narrow down the limits of Eulerian angles presenting crystal orientations, integrate crystal grains with similar crystal orientations, eliminate small crystal grains, select representative crystal orientation in each crystal grain, and so on. The interface was applied to an orientation map of polycrystal microstructure in pure titanium, and the course-grained geometric models were successfully obtained. Image-based CPFE analysis was conducted using the geometric models with different number of finite elements. The numbers of crystal grains were assumed to be around 50 in any geometric models. A dislocation density dependent constitutive equation was employed and uniaxial tensile loading was applied to the geometric models by the forced displacement. The results showed that spatial distributions of stress, strain, and dislocation density were good agreement among geometric models with different number of elements in both elastic and plastic ranges while values of the strain and dislocation density showed quantitatively dependency of the number of elements on their distributions in the plastic ranges. These features indicate that the qualitatively similar results can be obtained using the developed interface on the condition that coarse graining of the microstructures does not occur even though the number of elements is changed.</p>. |
| 4. | 3D Observation of Dislocations in Si Single Crystal using a High-angle Triple-axis (HATA) Specimen Holder. |
| 5. | 電子線トモグラフィーによる金属材料中の転位組織の3次元可視化への試み. |
| 6. | Erratum: Three-dimensional observation of dislocations by electron tomography in a silicon crystal (Materials Transactions (2008) 49:9 (1953-1956)). |
| 7. | 透過電子顕微鏡による結晶材料組織の3次元可視化. |
| 8. | HVEM Analysis of Slip Behavior around a Fatigue Crack Tip. |
| 9. | Three-dimensional Visualization of Dislocations Using Two Diffraction Conditions. |
| 10. | 集合組織を持つα‐Ti合金多結晶材料のモデル化および変形に関する結晶塑性有限要素解析. |
| 11. | α‐Ti多結晶体における降伏応力の温度依存性とその結晶塑性解析. |
| 12. | Ti‐6Al‐4V合金中lamellar組織の変形におけるβ相の役割. |
| 13. | Ti‐6Al‐4V合金におけるβ相の弾性率の変化と不均一変形の関係の結晶塑性解析. |
| 14. | Ti‐6Al‐4V合金の二相組織における変形挙動の結晶塑性解析. |
| 15. | Yoshiki Kawano, Tetsuya Ohashi, Tsuyoshi Mayama, Masaki Tanaka, Yelm Okuyama, Michihiro Sato, Image-based crystal plasticity analysis on the activities of slip systems in polycrystal alpha-Ti, Abstract Book of The 9th International Conference on Multiscale Materials Modeling, p.313, 2018.10. |
| 16. | Crack-tip Dislocations and Brittle-to-Ductile Transition, [URL]. |
| 17. | Observation of Dislocations in Thick Specimens Using by The High-Voltage Electron Microscopy with an Energy Filter, [URL]. |
| 18. | Aiming at Developing a Guiding Principle in Obtaining Steels with Further Strength and Toughness. |
| 19. | G. S. Liu, S. Hous, J. Kacher, M. Tanaka, K. Higashida, I.M. Robertson, Electron tomograhy of dislocation structures, Mater. Charact, 2014.01, [URL]. |
| 20. | Investigation of Deformation Behavior of Pearlitic Steel by The Fusion of Material Sciences and Solid Mechanics : A Search for A Guiding Principle for A Coexistence of High Strength and High Ductility. |
| 21. | Kenji Higashida and Masaki Tanaka, Mechanism behind Brittle-to-ductile Transition Understood by the Interaction between a Crack and Dislocations, ISIJ International, Vol.52, No.4, pp.704-709, 2012.04, [URL]. |
| 22. | Electron tomography to visualise dislocations in three-dimension. |
| 23. | Three-dimensional Visualization of Lattice Defects by Electron Tomography. |
| 24. | Three-Dimensional Imaging of Crystalline Microstructures Using Electron Tomography. |
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