基于COMSOL的粘接结构超声检测仿真分析  

Numerical Analysis of Ultrasonic Detection of Bonded Structures Based on COMSOL

作　　者：蔡笑风 章磊 孙湉 CAI Xiaofeng;ZHANG Lei;SUN Tian(School of Electrical and Electronic Information Engineering,Hubei Polytechnic University,Huangshi Hubei 435003)

机构地区：[1]湖北理工学院电气与电子信息工程学院,湖北黄石435003

出　　处：《湖北理工学院学报》2024年第5期7-12,共6页Journal of Hubei Polytechnic University

基　　金：湖北省自然科学基金项目(项目编号:2023AFD008);湖北省科技人才服务企业项目(项目编号:KJRQ2023000110)。

摘　　要：为揭示粘接结构内部超声检测信号传播规律,在建立粘接结构仿真模型基础上,采用多物理场耦合的有限元方法,对结构中不含缺陷及分别含有脱粘、气孔和裂纹缺陷时超声波的传播过程进行研究。结果表明,纵波和横波在介质中传播速度存在差异,两者会出现分离,纵波在前、横波在后;超声波在两介质中发生多次反射和模式转换,在侧表面上会形成表面波;超声波在脱粘及气孔缺陷处会发生全反射,其余处声波绕过缺陷继续向底面传播,缺陷面积越大,回波幅值也越高;裂纹处的回波波形与裂纹长度及方向都有关系,当与上表面夹角越接近90°,缺陷回波越难被接收到。该分析可为粘接结构的超声检测应用提供指导依据。In order to reveal the propagation law of ultrasonic detection signal inside the bonded structure,the multi-physics coupling finite element method was used to study the propagation process of ultrasonic waves in the structure without defects and with defects of debonding,porosity and crack respectively.The simulation results show that there is difference in the propagation speeds of P-wave and S-wave in the medium,and they are separated,with P-wave in front and S-wave behind.The ultrasonic waves were reflected and the modes changed many times in the two media,and the surface waves were formed on the side surface.The ultrasonic waves had total reflection at the debonding and stomatal defects,and the sound waves continued to propagate to the bottom surface around the defects.The amplitude of the back waves are also different between different defect locations.The echo waveform of the crack is related to the size of the crack,the angle,and the distance between the crack and the top surface.When the angle is closer to 90 degrees,it is difficult to receive the defect echo.The analysis can provide a basis for the application of ultrasonic detection of bonded structures.

关 键 词：粘接结构 超声检测 数值分析 多物理场 

分 类 号：TB553[理学—物理] TP274.3[理学—声学]