摘要
基于激光超声热弹理论的有限元仿真,对激光超声在复合材料内的传播规律进行了研究,并利用体波和表面波对碳纤维复合材料层合板的分层缺陷和表面缺陷进行了探测。结果表明,基于体波的检测方法可通过分层缺陷处的反射波及透射波幅值变化判断深度和边界;基于表面波的检测方法可通过反射波到达检测点的时间判断表面缺陷的位置;缺陷深度与反射波幅值正相关,与透射波幅值负相关;利用扫描激光源法在缺陷处扫查,能获得随扫查距离变化的信号幅值,且最大信号幅值远大于反射法。
Based on the finite element simulation of laser ultrasonic thermo-elastic theory,the propagation law of laser ultrasonic in composite materials is studied,and the delamination defects and surface defects of carbon fiber composite laminates are detected by body wave and surface wave.The results show that the detection method based on body wave can be used to judge the depth and boundary of the layered defect by the reflected wave and the amplitude change of the transmitted wave.Also,the detection method based on surface wave can judge the position of surface defect by the time when the reflected wave reaches the data point.The defect depth is positively correlated with the reflected wave amplitude and negatively correlated with the transmitted wave amplitude.The signal amplitude varying with the scanning distance can be obtained by the scanning laser source method,and the maximum signal amplitude is much larger than that determind by the reflection method.
作者
吴健豪
付兰凌
杨金水
WU Jianhao;FU Lanling;YANG Jinshui(School of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;Qingdao Innovation and Development Base,Harbin Engineering University,Qingdao,Shandong Province 266000,China)
出处
《现代应用物理》
2023年第3期97-105,共9页
Modern Applied Physics
基金
国家自然科学基金资助项目(12172098)
中央高校基本科研业务资助项目(3072021CFT0201)。
关键词
激光超声
碳纤维复合材料
无损检测
有限元仿真
热固耦合
laser ultrasound
compound material
NDT
finite element simulation
thermal-solid coupling
