3520 光音響法による楔状傾斜表面欠陥の非破壊検出(G03-14 非破壊技術,G03 材料力学)

抄録

Nondestructive testing (NDT) of tilted surface defect with wedge shape using Photoacoustic microscope (PAM) has been demonstrated. The specimens used in the experiments were pure aluminum plates. The tilted surface defect considered was a slit-type simulated defect with a wedge shape, whose length and maximum depth were fixed to be approximately 3.0mm and 0.3mm, respectively. The tilting surface defect with a width of 0.3mm was introduced into the specimen by mechanical processing. The angles (θ) of the surface defect were 60, 70, 80, and 90 degrees. The obtained signal distributions depend strongly upon the tilt angle and wedge shape of the defects. Furthermore, it was shown that the estimation of the complicated surface defect shape was plausible with this method.