Study on shock attenuation properties of CFRP lattice structures

• Project/Area Number: 18K04557
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Tomohiro Yokozeki 東京大学, 大学院工学系研究科(工学部), 准教授 (50399549)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
• Keywords: 軽量宇宙構造 / 複合材料 / 減衰性能 / 衝撃減衰 / 振動・衝撃 / 航空宇宙構造 / ラティス構造

Outline of Final Research Achievements

Shock attenuation properties of CFRP lattice structures are focused on and an efficient numerical simulation tool was developed considering the periodic lattice geometry. Numerical models predicted shock attenuation except for material damping due to geometrical effect of lattice structures. It was confirmed that lattice structures prevent waves with specific frequency ranges from propagation, and this stop-band characteristics can be designed. This study demonstrated that CFRP lattice structures can be utilized for light-weight high attenuation aerospace structures.

Academic Significance and Societal Importance of the Research Achievements

CFRPを用いたラティス構造に対応した効率的な予測モデルを開発し、ラティス構造の形状を工夫することで、ロケット等の宇宙構造の軽量性能を維持したまま衝撃減衰性能を高めるための設計指針を得ることに成功した。所望の減衰特性をもつ構造を設計する技術を獲得したことにより、ロケットなどの航空宇宙構造物の更なる軽量化が期待できる。

Research Products

• [Int'l Joint Research] IIT Kharagpur(インド)
• [Int'l Joint Research] IIT Kharagpur(インド)
• [Journal Article] Wave propagation analysis of one-dimensional CFRP lattice structure (2021)
  • Author(s): Iwata Yoshimasa, Yokozeki Tomohiro
  • Journal Title: Composite Structures Volume: 261 Pages: 113306-113306
  • DOI: 10.1016/j.compstruct.2020.113306
  • Peer Reviewed
• [Journal Article] Shock wave filtering of two-dimensional CFRP X-lattice structures: A numerical investigation (2021)
  • Author(s): Iwata Yoshimasa, Yokozeki Tomohiro
  • Journal Title: Composite Structures Volume: 265 Pages: 113743-113743
  • DOI: 10.1016/j.compstruct.2021.113743
  • Peer Reviewed
• [Presentation] CFRPラティス構造における波動伝播予測 (2020)
  • Author(s): 岩田佳将、横関智弘
  • Organizer: 第62回構造強度に関する講演会
• [Presentation] Vibration analysis of CFRP lattice structure (2019)
  • Author(s): Y. Iwata, V. Kumar, T. Yokozeki
  • Organizer: 15th Japan International SAMPE Symposium and Exhibition
  • Int'l Joint Research
• [Presentation] Evaluation of buckling behavior of X-lattice CFRP curved plate (2018)
  • Author(s): Yukihiko Hanaya, Tomohiro Yokozeki
  • Organizer: Indo-Japan Workshop 2018 on Highly Conductive CFRP
  • Int'l Joint Research
• [Presentation] X-ラティスCFRP曲面板の座屈挙動評価 (2018)
  • Author(s): 花谷有紀彦, 横関智弘、他
  • Organizer: 第60回構造強度に関する講演会