Detection of delamination in composite laminates using Lamb wave based nonlinear method
Detection of delamination in composite laminates using Lamb wave based nonlinear method
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DOI：
10.1016/j.compstruct.2016.09.073
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发表时间：
2017
影响因子：
6.3
通讯作者：
Nitesh P. Yelve;M. Mitra;P. Mujumdar
中科院分区：
文献类型：
--
作者：
Nitesh P. Yelve;M. Mitra;P. Mujumdar
在这项研究中，基于兰姆波的非线性方法被用来检测复合材料层合板的脱层。为此，在使用薄的聚四氟乙烯薄片的复合材料层压板中产生了人工分层。研究内容包括实验研究和有限元模拟。由于分层处的接触非线性，在兰姆波响应中观察到了两个更高的谐波。从基波和高次谐波的频谱信息中提取频谱损伤指数。结果表明，它与传感器位置不变，且随着分层宽度的增加，其值呈减小趋势。此外，还介绍了一种新的混合方法，其中光谱数据和时间数据一起用于定位分层。
In this study, a Lamb wave based nonlinear method is used to detect delamination in a composite laminate. For this purpose, an artificial delamination is created in a composite laminate using a thin Teflon sheet. The research includes an experimental study as well as finite element simulation. Two higher harmonics are observed in the Lamb wave response as a result of contact nonlinearity at the delamination. A spectral damage index is extracted from the spectral information of the fundamental and higher harmonics. It is found to be invariant to the sensor location and its values show decreasing trend with increase in the delamination width. Further, a new hybrid method is introduced, wherein the spectral and temporal data are used together in order to locate a delamination.