Evaluation of Material Integrity Using Higher-Order Harmonic Generation in Propagating Shear Horizontal Ultrasonic Waves

Materials Pub Date : 2024-08-09 DOI:10.3390/ma17163960

R. Radecki, Wieslaw J. Staszewski

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Abstract

Material nonlinearity is explored for the assessment of structural integrity. Crack–wave interactions are of particular interest. The major focus is on higher-order harmonics, generated in propagating shear horizontal (SH) waves. These harmonics are generated due to global material nonlinearity and local effects such as fatigue cracks. The theoretical background of the proposed method is explained. The method is examined using numerical simulations and experimental tests. The former involves the Local Interaction Simulation Approach (LISA), implemented for the nonlinear shear horizontal wavefield. The latter is based on a high-frequency shear excitation approach. Experimental tests are conducted using a series of beam specimens with fatigue cracks. Low-profile, surface-bonded piezoceramic shear actuators are used for excitation. The excitation frequency is selected to minimize the number of generated modes in the examined specimens. Nonlinear ultrasonic responses are collected using a non-contact laser vibrometer. The results show that higher-order harmonic generation—based on shear horizontal wave propagation—can be used for crack detection in the presence of global material nonlinearity.

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利用传播剪切水平超声波中的高阶谐波生成评估材料完整性

探索材料的非线性，以评估结构的完整性。裂纹波的相互作用尤其引人关注。主要重点是剪切水平（SH）波传播中产生的高阶谐波。这些谐波是由于整体材料非线性和疲劳裂纹等局部效应产生的。本文解释了所提方法的理论背景。通过数值模拟和实验测试对该方法进行了检验。前者涉及针对非线性剪切水平波场实施的局部相互作用模拟方法（LISA）。后者基于高频剪切激励方法。实验测试使用一系列带有疲劳裂纹的梁试样进行。激励采用了低剖面、表面粘结压电陶瓷剪切激励器。激励频率的选择是为了尽量减少受检试样中产生的模态数量。使用非接触式激光测振仪收集非线性超声波响应。结果表明，基于剪切水平波传播的高阶谐波生成可用于存在全局材料非线性的裂纹检测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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