Development of new non-destructive diagnostic system that combines advanced ultrasonic measurement and computational mechanics

2020 Fiscal Year Final Research Report

• Project/Area Number: 17H03294
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Gunma University
• Principal Investigator: Saitoh Takahiro 群馬大学, 大学院理工学府, 准教授 (00535114)
• Co-Investigator(Kenkyū-buntansha): 中畑 和之 愛媛大学, 理工学研究科(工学系), 教授 (20380256)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 炭素繊維強化プラスチック / 異方性 / 弾性定数 / 先進超音波計測 / 時間反転法 / 波動解析 / 逆解析 / 非破壊評価

Outline of Final Research Achievements

We conducted a research on the development of a new ultrasonic non-destructive evaluation method for FRP. We focused on the ultrasonic testing (UT) in this research. In general, the ultrasonic waves in FRP does not propagate isotropically because FRP has anisotropic property. Therefore, it is difficult for UT inspectors to understand the ultrasonic wave propagation behavior and this characteristic sometimes causes reduced accuracy to FRP inspection. To overcome the difficulty, we visualized complex ultrasonic wave propagation behavior in FRP using some simulation techniques, and utilized the visualization for UT for FRP. In addition, we developed basic non-destructive testing methods for FRP using advanced ultrasonic measurement methods such as laser ultrasonic waves and ultrasonic array transducers.

Free Research Field

非破壊評価、応用力学、計算力学、構造工学

Academic Significance and Societal Importance of the Research Achievements

近年，鋼やコンクリートに次ぐ材料として，繊維強化プラスチック(FRP)に注目が集まっている．FRPは鋼の数倍の引張強度を持つ等の優れた性質を示す一方，力学的に複雑な性質を示す異方性材料として知られている．そのため，これまでの材料に対する様々な指針をFRPに適用することは難しい．本研究では，FRPに対する維持管理を目的に，FRP中の欠陥を評価するための新しい非破壊評価法を確立するための研究を行った．先進超音波計測や計算力学を用いて，複雑なFRPに対する非破壊評価手法の様々な基礎を構築した．