A mode conversion based feature for crack depth evaluation in homogenous plates based on 3 D simulated Lamb waves
A mode conversion based feature for crack depth evaluation in homogenous plates based on 3 D simulated Lamb waves
复制标题
基于模式转换的特征，用于基于 3D 模拟兰姆波的均质板裂纹深度评估
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M. Soorgee
中科院分区：
文献类型：
--
作者：
M. Soorgee
本文是作者利用兰姆波特征对均匀板裂纹深度研究工作的数值推广。基于二维数值模拟的结果表明，在纯S0模式激励下，裂纹透射波和反射波中转换A0模式与散射S0模式的振幅比随裂纹深度的变化呈线性变化。本文的目的是通过三维有限元模拟来验证这一现象。由二维波与裂纹相互作用模拟得到的基于模态转换的振幅比ARR和ART可知，对于裂纹深度评价，除了dc=0.2外，ARR在三维模拟中也呈单调减小，可以用于真实裂纹检测中的裂纹深度评价
This paper is a numerical extension to the previous work done by the author on crack depth study in homogenous plates using Lamb wave based features. Based on 2D numerical simulations, it has been shown that, for pure S0 mode excitation, the amplitude ratio of both converted A0 mode, to the scattered S0 mode, in both transmitted and reflected waves from a crack, varies linearly as the crack depth changes. The goal of this paper is to verify this phenomenon via three dimensional finite element simulations. It is seen that from the mode conversion based amplitude ratios, ARR and ART, obtained from 2D simulation of wave interaction with the crack, for crack depth evaluation, ARR decreases monotonically in 3D simulation too, except for dc=0.2th, and can be employed for crack depth evaluation in real crack detection