The interaction of individual Lamb waves with a variety of defects simulated by notches is investigated using finite-element analysis, and the results are checked experimentally. Excellent agreement is obtained. It is shown that a 2-D Fourier transform method may be used to quantify Lamb wave interactions with defects. The sensitivity of individual Lamb waves to particular notches is dependent on the frequency-thickness product, the mode type and order, and the geometry of the notch. The sensitivity of the Lamb modes a/sub 1/, alpha /sub 0/, and s/sub 0/ to simulated defects in different frequency-thickness regions is predicted as a function of the defect depth to plate thickness ratio and the results indicate that Lamb waves may be used to find notches when the wavelength to notch depth ratio is on the order of 40. Transmission ratios of Lamb waves across defects are highly frequency dependent.
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机译：使用有限元分析研究了各个Lamb波与缺口模拟的各种缺陷之间的相互作用，并通过实验检查了结果。获得了极好的协议。结果表明，可以使用二维傅里叶变换方法来量化具有缺陷的兰姆波相互作用。各个兰姆波对特定陷波的敏感度取决于频率厚度乘积，模式类型和阶数以及陷波的几何形状。预测了Lamb模式a / sub 1 /，alpha / sub 0 /和s / sub 0 /对不同频率厚度区域中模拟缺陷的敏感性，是缺陷深度与板厚比的函数，结果表明当波长与切口深度之比约为40时，可以使用Lamb波来查找切口。Lamb波在缺陷之间的传输比与频率密切相关。
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