In the thermo-elastic mechanism, the process of interaction between laser and material is numerically simulated based on the theatrical model of the surface acoustic wave. The material deformation temperature changes and acoustic signals, with surface and sub-surface together with no defects are derived from it, as well as the filtering and modulating effects of the defects, moreover, the conclusion that attenuation characteristic of surface acoustic waves with sub-surface defects. Simulation is acted to explore the relation between the width and length with the detection effect. It is showed that the increase of both the width and the depth would lead to the loss of the rising edge signal components, at the same time, the transmission wave signal’s attenuation is more obvious.
丁一珊,杨世锡,甘春标. 利用激光超声技术研究金属裂纹缺陷的检测波特性[J]. 振动与冲击, 2015, 34(14): 33-37.
DING Yi-shan,YANG Shi-xi,GAN Chun-biao. Detecting features of defect metal based on laser ultrasonic. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(14): 33-37.
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