Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates
Quantitative assessment of through-thickness crack size based on Lamb wave scattering in aluminium plates
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DOI：
10.1016/j.ndteint.2007.07.003
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发表时间：
2008-01-01
影响因子：
4.2
通讯作者：
Yang, Chunhui
中科院分区：
文献类型：
--
作者：
Lu, Ye;Ye, Lin;Yang, Chunhui
用有限元方法和实验研究相结合的方法，分析了不同频率的Lamb波模式与铝板中不同长度穿透裂纹的相互作用。对于斜波入射，数值计算和实验结果都表明，裂纹的散射导致了复杂的传输、反射和绕射，并可能伴随着波模的转换。因此，采用双PZT驱动方案来产生具有增强能量的基本对称模式(SO)，以便于识别裂纹散射波分量。建立了裂纹长度与由希尔伯特变换得到的反射系数和透射率之间的关系，并通过该关系对裂纹长度进行了定量计算。分析了兰姆波波长和波的绕射对反射系数和透射率特性的影响。(C)2007爱思唯尔有限公司。保留所有权利。
The interaction of Lamb wave modes at varying frequencies with a through-thickness crack of different lengths in aluminium plates was analysed in terms of finite element method and experimental study. For oblique-wave incidence, both numerical and experimental results showed that the wave scattering from a crack leads to complicated transmission, reflection and diffraction accompanied by possible wave-mode conversion. A dual-PZT actuation scheme was therefore applied to generate the fundamental symmetrical mode (SO) with enhanced energy to facilitate the identification of crack-scattered wave components. The relationship between crack length and the reflection/transmission coefficient obtained with the aid of the Hilbert transform was established, through which the crack length was quantitatively evaluated. The effects of wavelength of Lamb waves and wave diffraction on the properties of the reflection and transmission coefficients were analysed. (c) 2007 Elsevier Ltd. All rights reserved.