2023 Fiscal Year Final Research Report
Creation of Functional Lattice Structure for Energy Absorption of Underwater Pressure Waves
| Project/Area Number |
21K14048
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Chuo University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | メカニカルメタマテリアル / 衝撃吸収 / 応力波 / ラティス構造 / 圧力波 |
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| Outline of Final Research Achievements |
To mitigate the damage caused by in-pipe explosions in industrial plants, it is crucial to incorporate an energy-absorbing mechanism to counteract pressure waves. This study aimed to develop a design theory for a "functional lattice structure" that combines two mechanisms: energy absorption by deformation of a three-dimensional lattice structure and energy attenuation/dissipation based on the principles of acoustic metamaterials. Numerical analysis and experiments were conducted to investigate the deformation and wave propagation characteristics of various lattice structures, focusing on their energy absorption performance. Then, phononic bandgap lattice structures were designed to suppress the propagation of elastic waves within a specific frequency range. It was suggested that combining and arranging the units to form a bandgap structure could attenuate the amplitude of the impact pressure load in its main frequency range.
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| Free Research Field |
機械材料・材料力学
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| Academic Significance and Societal Importance of the Research Achievements |
材料力学的観点からのラティス構造に関する既往の研究のほとんどは，ハニカム材に代表されるオープンセル構造体の研究の発展とも捉えることができる．本研究では音響メタマテリアルの設計原理をラティス構造に適用することで，既存のオープンセル構造体の特性を越えた波動エネルギ吸収/減衰機能を発現する材料を創製できる可能性を示した．本研究成果はラティス構造を含むメカニカルメタマテリアルの既往の研究に新たな展開局面を生み出す可能性を開くものであり，プラントにおける爆発事故や津波などの被害低減にも適用可能な，軽量かつ優れた衝撃吸収性能を有する新規材料を創製する可能性を開くものである．
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