| Project/Area Number |
11450041
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tohoku University |
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Principal Investigator |
ITO Koichi Graduate School of Information Sciences, Tohoku University, Professor, 大学院・情報科学研究科, 教授 (30005425)
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| Co-Investigator(Kenkyū-buntansha) |
KANNO Shokichi National Institute of Technology Ichinoseki, Professor, 教授 (20042202)
SHIBATA Katuhisa Graduate School of Information Sciences, Tohoku University, Assistant professor, 大学院・情報科学研究科, 講師 (20196421)
井澤 義明 東北大学, 大学院・工学研究科, 講師 (00143016)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2001: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2000: ¥4,200,000 (Direct Cost: ¥4,200,000)
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| Keywords | Crystal plasticity / Shear band / Finite element method / Plastic instability / Impact Buckling / 衝撃座届 / 複合負荷試験 |
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| Research Abstract |
For a ductile metal, localized shear banding appears as the preceding phenonemenon to the fracture. Initiation and developing of the shear band significantly influenced on the crystarograhic structure of the polycrystal materials and on loading paths. The puropose of the research project is to develop the method of optimization of crashworthiness of shock absorbing components by controlling the initiation and the developing of shear banding the obtained results are as follows.
1. For FCC crystals, the mathematical model of the criterion to the initiation of shear band is established. Introducing the hypothetical 13th slip system defined by the proposed criterion into the finite element polycrystal model, numerical simulator which can be applied to the problem of weakning of crystals caused by developing of shear banding is established.
2.Results of the numerical simulation and the experiment for plane strain compression of the FCC polycrystal shows that the shear banding penetrates or not according to the relative configuration of crystarographic orientation between ajacent crystal grain. The result suggests the possibily of the optimization of crashworthiness of the shock absorbing component made of polycrystal metals by controlling crystarographic texture of them.
3. Numerical simulater for impact problems of a beam and of a cylindrical shell is developed. It is clarified that strain rate sensitivety of a material slightly improve the crashworthiness of a beam and a thin shell structure.
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