A laser ultrasonic method based on guided waves was proposed to characterize delamination defects in Cu/Al composites. Simulation analysis was used to analyse to the propagation characteristics of laser ultrasound. The delamination defects made the mode of laser ultrasound change from surface wave to guided wave. The influences of delamination size on guided waves were analyzed to investigate the interaction between laser ultrasound and delamination. The amplitudes of the guided waves were used to characterize the delamination defect. A laser ultrasound experimental platform was built. The experimental results and simulation analysis results have similar trends and characteristics. The C-scan imaging results can show the location and size of the delamination defects. Therefore, the detection method based on laser ultrasonic technology is effective for delamination detection in Cu/Al composites, which can provide real-time monitoring data for the rolling process.

提出了一种基于导波的激光超声方法来表征Cu/Al复合材料中的分层缺陷。仿真分析用于分析激光超声的传播特性。分层缺陷使激光超声的模式从表面波转变为导波。分析分层尺寸对导波的影响，以研究激光超声与分层之间的相互作用。导波的振幅用于表征分层缺陷。搭建了激光超声实验平台。实验结果与仿真分析结果具有相似的趋势和特点。C扫描成像结果可以显示分层缺陷的位置和大小。所以，