Development of automobile shock absorbing member by made of high strength glass fiber and in-situ polymerizable thermoplastic resin

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04637
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 25020:Safety engineering-related
• Research Institution: Nihon University
• Principal Investigator: AOKI Yoshio 日本大学, 理工学部, 教授 (30184047)
• Co-Investigator(Kenkyū-buntansha): 平山 紀夫 日本大学, 生産工学部, 教授 (70582518)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 自動車衝撃吸収部材 / GFRP / 衝撃吸収特性 / フィラメントワインディング法 / 衝撃応答解析 / クラッシュボックス / 高強度ガラス繊維 / 落錘衝撃試験

Outline of Final Research Achievements

In this research, in order to enable mass production of fiber reinforced plastics, which have come to be used in multi-material automobile structures, with cheaper materials, GFRP shock absorbing members using high-strength glass fiber as a reinforcing material. The material design and manufacturing method were examined. In order to realize mass production, a crash box made of high-strength glass fiber and thermoplastic resin was prototyped by the filament winding method, and the energy absorption characteristics were verified by the drop weight impact test. As a result, the supporting load in the fracture process was stabilized for the steel structural member, and the fiber orientation angle and the Stacking Sequences of the GFRP shock absorbing member comparable to CFRP were verified. We were also able to develop a numerical analysis model that can reproduce the dynamic characteristics within an error of 5%.

Free Research Field

安全設計工学

Academic Significance and Societal Importance of the Research Achievements

現在、自動車には省エネルギー化と安全性向上が強く求められており、電気自動車や自動走行の実現が期待されている。このため、自動車車体には軽量化と安全性の両立が求められている。本研究で開発したＧＦＲＰ衝撃吸収部材は、軽量化と衝撃吸収特性の双方が、従来のＣＦＲＰ製部材に匹敵する特性を有する。さらに、フィラメントワインディング成形法を活用することで、より安価に大量生産が可能となる。さらに部材端部の締結部の設計を工夫することで、更なる衝撃吸収特性の向上や部品点数の削減、絶縁性など高機能化が見込めるため、電気自動車などに有用な構造部材と考えられる。