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Creation of Functional Lattice Structure for Energy Absorption of Underwater Pressure Waves

Research Project

Project/Area Number 21K14048
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionChuo University

Principal Investigator

Kojima Tomohisa  中央大学, 理工学部, 助教 (70802734)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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 / 衝撃 / エネルギ吸収 / 流体構造連成 / 波動伝播 / メタマテリアル
Outline of Research at the Start

プラントで配管内爆発事故が発生した最悪の事態における被害を低減するためには,発生する圧力波動のエネルギ吸収機構が極めて重要である.本研究では音響メタマテリアルが持つ構造の振動や波の干渉を利用した圧力波の調質・減衰機構の設計原理を抽出し,ラティス構造に適用することで,ラティス構造の変形によるエネルギ吸収と音響メタマテリアルの原理を適用したエネルギ減衰/散逸の2つの機構を併せ持つ『機能性ラティス構造』の設計学理を構築する.

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.

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.

Report

(3 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (7 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Journal Article] Compressive behaviour and energy absorption capacity of a lattice structure generated by topology optimisation2022

    • Author(s)
      Tomohisa Kojima, Yuta Takase, Tomoaki Tsuji
    • Journal Title

      International Journal of Materials and Product Technology

      Volume: 66 Issue: 1 Pages: 252-265

    • DOI

      10.1504/ijmpt.2022.10050727

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Finite Element Analysis on Plastic Collapse Behavior of Topology-Optimized Cellular Structure Subject to Compressive Loading2021

    • Author(s)
      Takase Yuta、Kawano Takahiro、Kojima Tomohisa、Tsuji Tomoaki
    • Journal Title

      Proceedings of the ASME 2021 International Mechanical Engineering Congress and Exposition

      Volume: 12

    • DOI

      10.1115/imece2021-70744

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 衝撃工学分野における研究を始めて(流体構造連成からメタマテリアルまで)2023

    • Author(s)
      小島朋久
    • Organizer
      日本材料学会 衝撃部門委員会 第168回衝撃部門委員会・講演会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] 固液連成界面における波動伝播現象の解明とラティスメタマテリアルによる水中圧力波減衰の試み2023

    • Author(s)
      小島朋久
    • Organizer
      日本機械学会 材料力学部門 材料力学における異分野融合に関する研究会 第13回研究会
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Dynamic Compressive Behavior of Polymeric Micro‐lattice Structure Fabricated by Optical 3D Printer2022

    • Author(s)
      Ryoya Kuriyama, Takahiro Kawano, Tomohisa Kojima, Hiroyuki Yamada, Kohei Tateyama, Tomoaki Tsuji
    • Organizer
      JSME International Conference on Materials and Processing 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 動的負荷を受けるマイクロラティス構造における応力波伝播の有限要素解析2022

    • Author(s)
      崎山悠悟, 小島朋久, 辻知章
    • Organizer
      日本機械学会 第35回計算力学講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] マイクロラティス構造の音響特性評価2021

    • Author(s)
      崎山悠悟, 高瀬雄太, 小島朋久, 辻知章
    • Organizer
      日本材料学会関東支部 学生研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] Finite Element Analysis on Plastic Collapse Behavior of Topology-Optimized Cellular Structure Subject to Compressive Loading2021

    • Author(s)
      Yuta Takase, Takahiro Kawano, Tomohisa Kojima, Tomoaki Tsuji
    • Organizer
      ASME 2021 International Mechanical Engineering Congress and Exposition
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] トポロジー最適化により設計したセル構造体の圧縮および塑性崩壊挙動の有限要素解析2021

    • Author(s)
      高瀬 雄太, 川野 貴弘, 小島 朋久, 辻 知章
    • Organizer
      日本機械学会 第34回計算力学講演会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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