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用于铝板缺陷无损检测的激光超声有限元模拟研究

Finite element simulation in laser ultrasound for non-destructive testing of aluminum defect materials

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【作者】 黄燕杰尚建华任立红程小劲

【Author】 HUANG Yanjie;SHANG Jianhua;REN Lihong;CHENG Xiaojin;School of Information Science and Technology,Donghua University;College of Mechanical Engineering,Shanghai University of Engineering Science;

【机构】 东华大学信息科学与技术学院上海工程技术大学机械工程学院

【摘要】 激光超声技术能够在材料表面形成超声波,是实现材料缺陷无损检测的重要环节。借助Abaqus有限元分析工具,基于激光超声热弹机制建立了轴对称铝板的表面缺陷模型,模拟了激光激发产生的表面波在材料中的传播特性及其与铝板缺陷的相互作用过程。数值模拟实验表明,铝板表面缺陷的分布深度值越大,反射波越强,并且当缺陷深度达到一定程度时,反射波的幅值趋于稳定;但缺陷的分布宽度对于反射波的影响则十分有限。所得结论为基于激光超声的材料缺陷的定量检测及识别提供有效的理论依据。

【Abstract】 It is able to generate the ultrasonic waves on the surface of materials based on the lasergenerated ultrasonic technology which is an important part of non-destructive testing for material defects.With the finite element analysis software of Abaqus,the defect model of the symmetric aluminum to be measured was established based on the laser ultrasonic thermo-elastic mechanism.Besides,the propagation characteristics of the laser-induced surface wave in the material and the interaction process between the laser-induced surface wave and the defects were simulated.Through the numerical simulation and theoretical analysis,the results show that the amplitude of the reflected wave increases with the depth of the defect and reaches steady state when the depth of the defect is up to a certain value.Instead,the width of the defect has a limited effect on the reflected wave.All of these conclusions can promote the development of the laser-generated ultrasonic technology for the detection and identification of the material defects.

【基金】 国家自然科学基金(51403034);中央高校基本科研业务费专项资金资助项目(2232017D-10)
  • 【文献出处】 应用光学 ,Journal of Applied Optics , 编辑部邮箱 ,2019年01期
  • 【分类号】TN249;TB559
  • 【被引频次】27
  • 【下载频次】518
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