Development of innovative defect detection technique based on Sonic-IR immersion method using resonance

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K14561
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: The University of Shiga Prefecture
• Principal Investigator: Izumi Yui 滋賀県立大学, 工学部, 准教授 (60610954)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 赤外線サーモグラフィ法 / Sonic-IR法 / 液浸式 / 非破壊検査 / 疲労き裂 / 固有振動

Outline of Final Research Achievements

Basic research to establish an inspection method using the immersion Sonic-IR method, in which ultrasonic waves are input to the test object through a liquid was conducted. First, the factors of the sound pressure distribution in the liquid were investigated. In addition, we confirmed the correlation between the relative vibration and heat generation at the crack. It was found that there are some natural vibration modes that particularly affect the heat generation at the cracks. From the results, an efficient inspection method that takes into account the sound pressure distribution in the liquid and the natural vibration of the test object is proposed.

Free Research Field

機械材料・材料力学

Academic Significance and Societal Importance of the Research Achievements

他の検査手法では検出が容易ではない閉口欠陥の検出を得意とするSonic-IR法に着目し，これまでの直接加振によるSonic-IR法では困難であった耐熱性，硬さ，剛性の劣る材料に対して検査が可能な液浸式手法の高精度化を実現し，鋼材の疲労き裂検出への実用化事例を示した．開発した検査方法は，幅広い材料へ容易に応用することができるものであり，非破壊検査分野において価値のある成果が得られた．