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Evaluation of crack orientation using fatigue crack-induced contact acoustic nonlinearity

机译:利用疲劳裂纹诱导的接触声非线性评估裂纹取向

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Based on the two-dimensional (2D)~1 and three-dimensional (3D)~2 analytical models previously developed for interpreting the contact acoustic nonlinearity (CAN) generated due to the modulation from a "breathing" crack in solid media on propagating guided ultrasonic waves (GUWs), this study proposes a new characterization approach, able to orientate a fatigue crack, even when the crack is at its embryo stage. CAN embodied in the scattered Lamb waves and shear horizontal (SH) waves converted from incident GUWs is extracted upon interaction with fatigue cracks, and the unique scattering pattern of CAN is associated with crack slant via the 3D analytical models, whereby the orientation of a fatigue crack can be pinpointed, without making a reference to the baseline signal. Experimental validation of the characterization approach is implemented, in which an undersized fatigue crack is orientated accurately and visualized in the image.
机译:基于先前开发的用于解释接触声非线性(CAN)的二维(2D)〜1和三维(3D)〜2分析模型,该模型是由于传播的引导下固体介质中“呼吸”裂纹的调制而产生的超声波(GUWs),这项研究提出了一种新的表征方法,即使在裂纹处于萌芽阶段时也能够确定疲劳裂纹的方向。通过与疲劳裂纹相互作用,提取从入射GUW转换而来的兰姆散射波和剪切水平(SH)波中体现的CAN,并通过3D分析模型将CAN的独特散射模式与裂纹倾斜相关联,从而确定疲劳的方向可以在不参考基线信号的情况下查明裂缝。实现了表征方法的实验验证,其中,尺寸过小的疲劳裂纹可以准确定向并在图像中可视化。

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