| Project/Area Number |
26420747
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Daido University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 延性破壊 / 微視的空孔モデル / 鍛造加工 / 微視的モデル / 空孔合体モデル / 据込み加工 / 空孔モデル / 予ひずみ |
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| Outline of Final Research Achievements |
Ductile fracture, which occurs when a material is subjected to large plastic deformation, is troublesome during metal-forming processes. Numerous ductile fracture criteria have been proposed for various materials. However, a ductile fracture criterion that is applicable to all metal-forming processes has not been found. Ductile fracture is a microscopic phenomenon because it occurs through nucleation, growth, and coalescence of voids. However, ductile fracture criteria that are widely used for metal-forming processes are derived from a macroscopic viewpoint.
The author proposed a void model from a microscopic viewpoint, in which void coalescence is predicted by the upper bound theory whose physical meaning is definite. In this study, ductile fracture in upset forging was predicted by the microscopic void model.
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