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Physical-virtual time reversing of nonlinear Lamb waves for fatigue crack detection and quantification

机译：非线性羊羔波用于疲劳裂纹检测和量化的物理虚拟时间逆转

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摘要

This article presents the investigation of a nonlinear Lamb wave time reversing technique for fatigue crack detection and quantification. A 2D analytical framework is initially presented, modeling Lamb wave generation, propagation, wave crack linear and nonlinear interaction, and reception. This study extends the Time Reversal (TR) techniques into the realm of nonlinear Lamb waves. Due to the structural transfer function variation between the forward and backward transmission process, the Virtual Time Reversal (VTR) algorithm reveals obvious deviation for predicting nonlinear Lamb waves, given that it replaces the backward TR procedure with the forward transfer function. However, this study demonstrates that the difference between the physical nonlinear TR method and the conventional VTR algorithm proves to be sensitive to detect and quantify fatigue cracks. Fatigue tests on a thin aluminum plate with a rivet hole are conducted to induce a fatigue crack. The experimental results further illuminate that the proposed physical-virtual nonlinear Lamb wave TR technique possesses remarkable sensitivity to the nudeation and growth of fatigue cracks. The paper finishes with discussion, concluding remarks, and suggestions for future work.
机译：本文介绍了对疲劳裂纹检测和量化的非线性兰姆波时间反转技术的研究。最初呈现了2D分析框架，建模LAMB波浪产生，传播，波裂线性和非线性相互作用和接收。该研究将时间逆转（TR）技术扩展到非线性羊羔波的领域。由于前向和向后传输过程之间的结构传递函数变化，鉴于其替换前转移功能的后向TR过程，虚拟时间反转（VTR）算法揭示了用于预测非线性LAMB波的明显偏差。然而，该研究表明，物理非线性TR方法和传统VTR算法之间的差异证明是对检测和量化疲劳裂缝的敏感性。通过铆钉孔的薄铝板上的疲劳试验进行诱导疲劳裂缝。实验结果进一步照亮了所提出的物理虚拟非线性羊毛浪潮TR技术对疲劳裂缝的果断和生长具有显着敏感性。本文随着讨论，结束言论和未来工作的建议完成。

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  • 来源
    《Mechanical systems and signal processing》 |2021年第11期|107921.1-107921.16|共16页
  • 作者

    Junzhen Wang; Yanfeng Shen; Danyu Rao; Wu Xu;

  • 作者单位

    University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai 200240 China;

    University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai 200240 China Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai 200240 China;

    School of Aeronautics and Astronautics Shanghai Jiao Tong University Shanghai 200240 China;

    School of Aeronautics and Astronautics Shanghai Jiao Tong University Shanghai 200240 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nonlinear Lamb waves; Time reversal; Fatigue crack; Structural health monitoring; Nondestructive evaluation;

    机译：非线性羊羔波;时间逆转;疲劳裂缝;结构健康监测;无损评估;

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