摘要
为了明确点阵结构中激光诱导多模态超声波的特征及其传播规律,采用有限元方法建立了激光激发点阵夹芯结构中超声波的多场耦合力学模型。将脉冲激光等效为高斯热源,将点阵结构模型合理简化,并进行了模型正确性的实验验证。讨论了点阵结构的夹芯板和支撑杆上超声波的传播规律,以及典型缺陷对超声波传播的影响。结果表明,上夹芯板上激光诱导的超声波具有多模态性,由于夹芯板较薄,产生了能量较大的反射回波。支撑杆与上夹芯板连接处,超声波发生明显的反射,仅有一小部分传播到杆上,在支撑杆表面传播形态为纵波。缺陷会明显产生反射波,在支撑杆缺陷的上方布置探针,可以有效检测到缺陷。
In order to clarify the characteristics and propagation laws of laser-induced multimodal ultrasonic waves in lattice structures,the finite element method is used to establish a multi field coupled mechanical model of laser ex-cited ultrasonic waves in lattice sandwich structures.Equivalent the pulsed laser to a Gaussian heat source,simplify the lattice structure model reasonably,and experimentally verify the correctness of the model.Discussed the propaga-tion law of ultrasonic waves on sandwich panels and support rods with lattice structure,as well as the influence of typi-cal defects on ultrasonic wave propagation.The results indicate that laser-induced ultrasonic waves on the upper sand-wich panel has multimodality,and due to the thin sandwich panel,high-energy reflected echoes are generated.At the connection between the support rod and the upper sandwich panel,ultrasonic waves undergo significant reflection,with only a small portion propagating onto the rod,and the propagation pattern on the surface of the support rod is longitudi-nal waves.Defects will significantly generate reflected waves,and placing probes above the defects on the support rod can effectively detect them.
作者
薛志博
张金平
许茂雨
战宇
XUE Zhibo;ZHANG Jinping;XU Maoyu;ZHAN Yu(Manufacturing Engineering Technology Research Laboratory,AECC Shenyang Engine Research Institute,Shenyang 110015,China;Collage of Science,Northeastern University,Shenyang 110819,China)
出处
《激光杂志》
北大核心
2025年第8期45-53,共9页
Laser Journal
基金
国家自然科学基金资助项目(No.51771051)
中央高校基本科研业务费专项资金资助项目(No.N2105021)。
关键词
激光超声
点阵夹芯结构
有限元
缺陷检测
laser ultrasonic
lattice sandwich structure
finite element method
defect detection
作者简介
薛志博(1987-),男,高级工程师,主要研究方向:航空发动机材料与结构设计。E-mail:315440450@qq.com;通讯作者:战宇(1980-),男,博士,副教授,博士生导师,主要研究方向:激光超声、残余应力。E-mail:zhanyu@mail.neu.edu.cn。
