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Feasibility of high frequency guided wave crack monitoring

机译：高频导波裂缝监测的可行性

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Ultrasonic guided waves are particularly interesting for SHM applications because they have the ability to propagate long distances with minimal attenuation. Using the baseline subtraction approach, the signal from a defect free structure is subtracted from the actual monitoring signal to detect and characterize defects. Low frequency guided wave SHM and the interaction of the fundamental guided wave modes with various types of defect are well documented in the literature. There are, however, only a very limited number of studies on high order modes. High frequency guided waves may enable the detection of smaller cracks relative to conventional low frequency guided wave SHM. The main difficulty at high frequency is the existence of several modes with different velocities. This study investigates the scattering of high frequency Lamb waves around a through-thickness hole with a view to developing a highly sensitive SHM system for safety-critical components. A 3D finite element model of a 305 x 305 x 1.6 mm aluminum plate was used to determine the scattered field generated by cracks on the circumference of a through-thickness hole in the middle of the plate. Crack properties such as orientation, length and depth were studied. A subset of the finite element simulations were validated against experimental results. The experimental setup comprised a classic contact piezoelectric transducer bonded on the side of the plate and a laser interferometer detector.
机译：超声波导波在SHM应用中特别受关注，因为它们具有以最小的衰减传播长距离的能力。使用基线减法，可以从实际监测信号中减去来自无缺陷结构的信号，以检测和表征缺陷。低频导波SHM以及基本导波模式与各种类型缺陷的相互作用在文献中都有详细记录。但是，关于高阶模式的研究非常有限。相对于常规的低频导波SHM，高频导波可以实现较小裂纹的检测。高频的主要困难是存在几种具有不同速度的模式。这项研究调查了贯穿整个厚度孔的高频兰姆波的散射，以期开发出用于安全关键部件的高度灵敏的SHM系统。使用305 x 305 x 1.6 mm铝板的3D有限元模型来确定由板中间的通孔直径的圆周上的裂纹产生的散射场。研究了裂纹的性质，如取向，长度和深度。针对实验结果验证了有限元模拟的子集。实验装置包括粘合在板侧面的经典接触式压电传感器和激光干涉仪检测器。

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