Impact mitigation via nonlinear wave propagation based on energy trapping and releasing behaviors

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14154
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: Japan Aerospace EXploration Agency
• Principal Investigator: Yasuda Hiromi 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 助教 (10910903)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 衝撃吸収構造 / 非線形波動 / 機械的メタマテリアル / マルチステイブル構造

Outline of Final Research Achievements

We designed and analyzed multistable architected structures for developing a reusable energy-absorbing device. We started by introducing a numerical model to examine the multistability of unit cell structures, and we then constructed a chain of such multistable components to explore wave dynamics. In particular, we studied nonlinear wave propagation in our multistable system by applying impact to the system. Our analysis shows that our structure can exhibit impact mitigation behavior arising from the energy-trapping behavior. In addition, due to the stored elastic energy, we observed the formation of transition waves to change the configuration of the structure to its initial state. Also, we fabricated a prototype and demonstrated such energy-trapping/-releasing behaviors in a repeatable manner.

Free Research Field

構造力学

Academic Significance and Societal Importance of the Research Achievements

これまでの塑性変形に基づく衝撃吸収材では、一度使用すると元の形状に戻すことはできないため繰り返しの利用は困難であるが、弾性変形のみによるエネルギーの吸収・散逸により、再使用可能な衝撃吸収構造が期待できる。また、本研究で対象とした構造を線形・非線形波動の研究におけるプラットフォームとして用いることで、異なる非線形波動同士の衝突といった様々な波動現象の探求につながると考える。