| Project/Area Number |
16F16902
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Tokyo Institute of Technology |
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| Co-Investigator(Kenkyū-buntansha) |
Bui Tinh・Quoc 東京工業大学, 環境・社会理工学院, 特任准教授 (00796831)
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| Project Period (FY) |
2016-07-27 – 2018-03-31
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| Project Status |
Granted (Fiscal Year 2016)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2016: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | fracture mechanics / Damage mechanics / functional material / Concrete / Extended finite element / Local mesh refinement / Finite element analysis / Structural mechanics |
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| Outline of Annual Research Achievements |
The complex heterogeneous nature of composites and concrete with suffering complicated processes of loading and environmental conditions additionally makes it highly difficult and burdensome in numerical prediction of progressive failure and damage. In a similar manner, accurate numerical modeling of imperfections/failure in polarized functional materials to some extent is quite challenging and often not trivial due to the anisotropic material behaviors and inherent coupling effect of different fields (electric, magnetic, mechanical, temperature, etc. The failure of structures and materials can arise during the manufacturing process or in-service. Such failure strongly affects the performance of structures and systems. The overriding objective of the applicant’s research has been to develop effective computational numerical methods in terms of enrichment, adaptivity, smeared approaches, and their variants for localized failure and instabilities of advanced functional composite materials and quasi-brittle materials (concrete). Research implementation and results have been obtained from this project can be stated as follows. We have developed the local enrichment techniques and the continuum damage models for modeling crack and damage problems of concrete, solids and advanced functional composites. We also have developed the local mesh refinement extended finite element method for fracture problems. Obtained results have been published in the professional scientific journals and have been presented at various professional conferences.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The project had been progressed very well as its main problems have been targeted and research results have successfully published in the professional scientific journals. More specifically, improved extended finite element approaches that have been developed and successfully applied for failure modeling of advanced functionally composite materials and concrete are now used for further study of dynamic crack problems in anisotropic materials. Results for some problems of plates/shells have also obtained so far. We definitely have more new ideas for our new studies and previous knowledge is essential. Very recent work is devoted to a new journal paper on development of a new regularization computational technique, which is to accurately model shear band problem in concrete.
On the other hand, project had been more than the original plan as it supports us to have collaborations with international colleagues from other institutions.
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| Strategy for Future Research Activity |
The new research works are devoted to the more specific problems on advanced composites and quasi-brittle materials like concrete. In particular, failure modeling of fibre reinforced composite and concrete using a new method of regularization and homogenization has been scheduled for our future works. While the homogenization technique is adopted to calibrate the material parameters, which are then used for continuum damage models. The recently developed smoothing gradient damage model with evolving anisotropic nonlocal interaction zone by the author, which is highly suited for shear band problem, will be applied to fiber reinforced composites and quasi-brittle materials.
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