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首页> 外文期刊>Fatigue & fracture of engineering materials and structures >Comparative study of nonlinear acoustic and Lamb wave techniques for fatigue crack detection in metallic structures
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Comparative study of nonlinear acoustic and Lamb wave techniques for fatigue crack detection in metallic structures

机译：非线性声波和兰姆波技术在金属结构疲劳裂纹检测中的比较研究

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The paper deals with fatigue crack detection in metallic structures, A simple fatigue experiment is performed to initiate and propagate a crack in an aluminium plate. The plate is instrumented with two low-profile piezoceramic transducers and one low-profile piezoceramic stack actuator. Nonlinear acoustics and Lamb waves are used for crack detection. The former utilizes the high-frequency acoustical wave and low-frequency modal excitation for damage detection. Modulations sidebands around the acoustical spectral component are used to detect the crack. The latter produces Lamb wave responses that are de-correlated due to the presence of the crack. Both effects are due to growing fatigue crack. Two simple signal parameters, namely the intensity of modulation and the normalized cross-correlation coefficient are used as damage indicators. The study demonstrates similar sensitivity of both methods to small fatigue cracks.
机译：该论文涉及金属结构中的疲劳裂纹检测，执行了一个简单的疲劳实验以在铝板上引发和扩展裂纹。该板装有两个低轮廓的压电陶瓷换能器和一个低轮廓的压电陶瓷叠层致动器。非线性声学和兰姆波用于裂纹检测。前者利用高频声波和低频模态激励进行损伤检测。声学频谱分量周围的调制边带用于检测裂纹。由于裂纹的存在，后者产生的兰姆波响应不相关。两种作用都是由于疲劳裂纹的增长。两个简单的信号参数，即调制强度和归一化互相关系数，被用作损伤指标。研究表明两种方法对较小的疲劳裂纹具有相似的敏感性。

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