アルミニウム平板における内部き裂の非破壊検査

抄録

In recent years, technologies utilizing an infrared thermography have attracted attention in the field of nondestructive inspections. In particular, research on, so called, the Sonic-IR method has been promoted in which heat generation in a defective portion is induced by ultrasonic vibration and observed by an infrared thermography. The Sonic-IR is a nondestructive inspection technology that is attracting attention because it can detect defects in a wide range and has a short time to detection. However, there are few cases where internal defects are detected in the research of Sonic-IR, and there are still some problems before practical use. Therefore, in this study, two aluminum plates were bonded with an adhesive, and an internal defect within a specimen was simulated by intentionally creating an air space. The Sonic-IR was performed on the specimen to verify whether defects could be detected. As a result, heat generation was observed in the specimen that was intentionally vacated, and the air space could be detected. In the future, more experiments with changing the dimensions of the specimen, the fixing method and the size of the air space will be performed.