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A Nonlinear Acoustic Technique for Crack Detection in Metallic Structures

机译：用于金属结构裂缝检测的非线性声学技术

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摘要

A crack detection technique based on nonlinear acoustics is investigated in this study. Acoustic waves at a chosen frequency are generated using an actuating lead zirconate titanate (PZT) transducer, and they travel through the target structure before being received by a sensing PZT wafer. Unlike an undamaged medium, a cracked medium exhibits high acoustic nonlinearity which is manifested as harmonics in the power spectrum of the received signal. Experimental results also indicate that the harmonic components increase nonlinearly in magnitude with increasing amplitude of the input signal. The proposed technique identifies the presence of cracks by looking at the two aforementioned features: harmonics and their nonlinear relationship to the input amplitude. The effectiveness of the technique has been tested on aluminum and steel specimens. The behavior of these nonlinear features as crack propagates in the steel beam has also been studied.
机译：本文研究了一种基于非线性声学的裂纹检测技术。使用致动的钛酸锆钛酸铅（PZT）换能器产生选定频率的声波，并且在被感测PZT晶片接收之前，它们会穿过目标结构。与未损坏的介质不同，破裂的介质显示出很高的声学非线性，这在接收信号的功率谱中表现为谐波。实验结果还表明，谐波分量的幅度随输入信号幅度的增加而非线性增加。所提出的技术通过查看上述两个特征来识别裂纹的存在：谐波及其与输入振幅的非线性关系。该技术的有效性已在铝和钢样品上进行了测试。还研究了这些非线性特征随裂纹在钢梁中传播的行为。

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  • 来源
    《Structural health monitoring》 |2009年第3期|251-262|共12页
  • 作者

    Debaditya Dutta; Hoon Sohn; Kent A. Harries; Piervincenzo Rizzo;

  • 作者单位

    Department of Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA - 15213, USA;

    Department of Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA - 15213, USA Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea;

    Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA - 15261, USA;

    Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA - 15261, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    nondestructive testing (NDT); active sensing; nonlinear acoustics; harmonics; fatigue cracks;

    机译：无损检测（NDT）;主动感应非线性声学谐波;疲劳裂纹;

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