Ultrasonic visualizing technique at high temperature for health diagnosis of heat-resistant composite materials

2021 Fiscal Year Final Research Report

• Project/Area Number: 18H01332
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18010:Mechanics of materials and materials-related
• Research Institution: The University of Tokyo
• Principal Investigator: Okabe Yoji 東京大学, 生産技術研究所, 教授 (90313006)
• Co-Investigator(Kenkyū-buntansha): 齋藤 理 東京大学, 生産技術研究所, 助教 (00795130)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Keywords: 超音波非破壊検査 / 高温環境 / 可視化 / 耐熱複合材料 / 健全性診断

Outline of Final Research Achievements

An ultrasonic visualizing system applicable to high temperatures was developed by the combination of an optical fiber ultrasonic sensor and a laser-ultrasonic technique in order to inspect non-destructively the health condition of structures made of heat-resistant composite materials under high temperature. By using this system, we succeeded in visualizing the propagation behavior of ultrasonic guided waves in a structural material at high temperature of 1000 degrees Celsius. In addition, an accurate detection method for microscopic damage in composite materials was established by separation of multiple modes existing in the ultrasonic guided wave propagating in the composite material to observe the mode conversion behaviors at the damage.

Free Research Field

構造健全性診断システム

Academic Significance and Societal Importance of the Research Achievements

本研究で構築した1000℃レベルの高温での超音波可視化検査技術は、国内外でも他に例を見ない独自性の高い手法であり、発電設備や大型輸送機器エンジン等の安全性向上とメンテナンスコストの削減に貢献しうると考えらえる。さらに本研究で確立した超音波ガイド波のモード変換挙動に基づく損傷検知手法は、耐熱複合材料の高温環境における破壊進展挙動の解明にも役立つと考えられ、材料工学分野等での学術的な波及効果も期待できる。