摘要
为了探究激光冲击所产生的超声波信号在缺陷材料检测中的作用,本文凭借有限元分析手段,采用COMSOL软件建立了激光超声无损检测材料内部缺陷的有限元模型,并模拟了激光在材料中激发,产生横波和纵波,沿材料内部的传播过程,得到了在激光作用下铝板内部的声场分布,还模拟了激光超声与铝板内部裂纹缺陷和气孔之间的相互作用。仿真结果证明:激光超声能够在铝板内部产生超声波。通过对反射波信号及其时间的分析,可确定缺陷在材料中的深度位置,实现宽度0.4 mm以上的裂纹检测,且信号峰值与裂纹宽度之间存在着正相关关系。为在实际中检测材料内部的缺陷提供了理论基础。
In order to explore the role of ultrasonic signals generated by laser shock in detecting defective materials,with the help of finite element analysis,this article uses COMSOL software to establish a finite element model of laser ultrasonic non-destructive testing of internal defects in materials,and simulates the laser excitation in materials And the propagation process of the longitudinal wave along the inside of the material obtained the sound field distribution inside the aluminum plate under the action of the laser.The interaction between laser ultrasound and crack defects and pores in the aluminum plate was simulated.The simulation results prove that laser ultrasound can generate ultrasound inside the aluminum plate.Through the analysis of the reflected wave signal and its time,the depth position of the defect in the material can be determined,and crack detection with a width of more than 0.4mm can be achieved,and there is a positive correlation between the signal peak and the crack width.It provides a reliable theoretical basis for detecting defects in materials in practice.
作者
陈超
张兴媛
宋大成
王啸伟
CHEN Chao;ZHANG Xingyuan;SONG Dacheng;WANG Xiaowei(School of Air Transportation,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《智能计算机与应用》
2020年第5期89-92,97,共5页
Intelligent Computer and Applications
关键词
激光超声
仿真
内部缺陷
有限元
laser ultrasound
simulation
internal defects
finite element
