Higher precision measurement on mechanical properties of materials based on the Taylor impact test for reductions in damage from hyper velocity impacts

2022 Fiscal Year Final Research Report

• Project/Area Number: 20H02353
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Hiroshima University
• Principal Investigator: Iwamoto Takeshi 広島大学, 先進理工系科学研究科(工), 准教授 (40274112)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 超高速衝突 / 損傷回避 / 材料力学特性 / テイラー衝撃試験法 / 高精度測定

Outline of Final Research Achievements

By extending the classical Taylor impact testing(TI) method, which is a method for measuring the mechanical properties of materials in the ultra-high strain rate range, we have developed a measurement system that can obtain highly accurate information on the stress, strain, strain rate, and temperature curve in a single measurement. We developed each elemental technology, and verified the usefulness of the integrated measurement system. Furthermore, by changing from air to high-pressure light gas, the impact velocity was improved, and compression tests were performed at ultra-high strain rates, making it possible to clarify unknown thermo-mechanical material properties.

Free Research Field

衝撃工学

Academic Significance and Societal Importance of the Research Achievements

宇宙開発の促進の観点から，10^5/s 以上のひずみ速度を対象とした超高ひずみ速度域の特性として高ひずみ速度域までの実測データからの推測値が用いられる場合が多く，超高速域ではひずみ速度に対する非線形性が認められるため，安全設計上のマージンを大幅に取らざるを得なかった．本研究の成果から，超高ひずみ速度域における，構造材料が持つ強度特性の非線形性の解明が可能となった．実際，以上は，「どの様にすれば超高ひずみ速度域の材料力学特性を簡便かつ精確に実測できるのか」は，長年多くの研究者が取り組んできた課題であり，その解決に役に立つ．