北京航空航天大学学报

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层状各向异性复合材料激光超声传播特性与分层表征方法

孙广开1,周正干2   

  1. 1. 北京航空航天大学
    2. 北京航空航天大学机械工程及自动化学院
  • 收稿日期:2016-12-19 修回日期:2017-04-24 发布日期:2017-06-27
  • 通讯作者: 周正干
  • 基金资助:
    南昌航空大学, 航空检测与评价航空科技重点实验室, 开放基金课题资助

Propagation characteristic of laser ultrasound in layered anisotropic composite material and the characterization of delamination

  • Received:2016-12-19 Revised:2017-04-24 Published:2017-06-27

摘要: 揭示层状各向异性复合材料中激光超声的传播特性及其对分层表征的影响,提出复合材料分层激光超声检测参量控制方法。采用有限元方法建立层状各向异性复合材料三维模型,基于热弹耦合理论计算激光超声传播过程,分析得出材料层状各向异性导致光激声场的非对称性分布、声束倾斜和畸变特征,以及材料内部分层界面对激光超声的反射和衰减作用;利用激光超声实验装置和模拟分层试样,采用数值计算与实验方法研究分层界面导致激光超声的反射和衰减特性,分析声波测量位置、超声频率和分层尺寸、深度位置对缺陷表征的影响,得出利用激光超声表征分层的光声学参量控制方法;采用激光超声C扫描方法得到模拟分层试样的C型图,得出直径1mm以上模拟分层的形状、尺寸和分布特征。研究结果表明:通过控制激光和超声参量能够减小复合材料层状各向异性对分层表征的影响,提高层状复合材料内部分层的激光超声表征准确度。

关键词: 航空航天, 复合材料, 分层, 激光超声, 无损检测

Abstract: The propagation characteristic of laser ultrasound in layered anisotropic composite material and its influences on the characterization of delamination is presented, and for the testing of delamination in composites, the method for controlling the parameters is proposed. The 3D model of the layered anisotropic composite material is built using the finite element meth-od, and the propagation of laser ultrasound is calculated based on the thermoelastic theory. The asymmetric distribution and beam tilt and distortion induced by the layered anisotropic property of the material, and the reflection and attenuation of laser ultrasound induced by the interface of internal delamination are analyzed. Based on the laser ultrasonic experiment setup and composite specimen, the reflection and attenuation characteristics, and the influences of the measuring position, ultrasonic frequency and the size and depth location of the delamination on defect characterization are analyzed using the numerical calculation and experiment method. The C scan image of the specimen with simulated delamination is obtained using the C scan method, and the shape, size and distribution characteristics of the delamination with a diameter larger than 1mm are obtained. The results prove that the influences of the layered anisotropic property of composite material on the characterization of delamination can be decreased through controlling the laser and ultrasonic parameters, thus improve the accuracy for the characterization of internal delamination in layered anisotropic composites with laser ultrasound.

Key words: Aerospace, Composite, Delamination, Laser ultrasound, Nondestructive testing

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