2022 Fiscal Year Final Research Report
Fabrication and Control for Kink Deformation With Mille-feuille Structures of New Metals and Polymers
| Project Area | Materials science on mille-feullie structure -Developement of next-generation structural materials guided by a new strengthen principle- |
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| Project/Area Number |
18H05483
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Yamagata University |
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Principal Investigator |
Ito Hiroshi 山形大学, 大学院有機材料システム研究科, 教授 (20259807)
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| Co-Investigator(Kenkyū-buntansha) |
寺田 大将 千葉工業大学, 工学部, 准教授 (80432524)
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| Project Period (FY) |
2018-06-29 – 2023-03-31
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| Keywords | 高分子系ミルフィーユ構造材料 / 金属系ミルフィーユ構造材料 / 特殊塑性加工法 / 多層共押出成形 / ポリマー共重合体 / 高圧プレス / キンク形成 |
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| Outline of Final Research Achievements |
In order to extend the kink strengthening mechanism of mille-feuille structures to materials other than Mg-based alloys, we have created new mille-feuille structure materials by kink formation and strengthening of layered new metal, ceramic, and polymer mille-feuille structure substances using a unique plastic forming method.
As a result, kink formation was confirmed in polymeric materials by high-pressure pressing, which is one of the special processing methods. In these kinked materials, strength improvement was also observed.Therefore, it was clarified that kink formation and kink strengthening can be realized by selecting the optimum conditions. However, we could not fully discuss the elucidation of the mechanism of kink strengthening, mille-feuille conditions, and kink formation conditions.
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| Free Research Field |
高分子成形加工
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| Academic Significance and Societal Importance of the Research Achievements |
高分子材料における結晶ラメラや相状構造が変形によってキンク（折れ曲がり）形成が生じ、その折れ曲がり構造が力学特性へ与える影響については十分な議論がなされてこなかった。一般には、分子鎖が折れ曲がることで、力学特性は低下することが容易に予想されるが、金属分野で発見されたキンク形成による材料強度が高分子系やセラミックス系にも展開が可能かを調べた。その結果、高分子系においても分子鎖、結晶ラメラ、相状層間を最適に制御し、適度なキンク形態を付与することで力学特性（延性や強度）を向上させることを明らかにしたことは高分子材料学においても重要な知見を与えたものと考える。
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