Localization and characterization of delamination in laminates using the local wavenumber method
Localization and characterization of delamination in laminates using the local wavenumber method
复制标题
使用局部波数法对层压板分层进行定位和表征
DOI：
10.1016/j.compstruct.2020.111972
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发表时间：
2020-04
影响因子：
6.3
通讯作者：
Haosen Chen
中科院分区：
文献类型：
--
作者：
Guoqi Zhao;Ben Wang;Wenfeng Hao;Ying Luo;Haosen Chen
本文提出了一种方法，有效地定位和表征的碳纤维/环氧树脂（CF/EP）复合材料层合板的模式I分层使用的局部波数方法传播的导波在一个细网格的空间采样点。使用双悬臂梁（DCB）试样进行I型层间断裂试验，以评估所开发的方法。采用二维有限元法模拟了不同中心频率下含脱层复合材料层合板中的波传播。结果揭示了导波与脱层相互作用的一些独特机理。结果表明，在脱层处，波的传播速度发生了变化，随着中心频率的增加，波的衰减和频散增大。在实验研究中，使用非接触式扫描激光多普勒测振仪（SLDV）系统在每个网格点处快速激发导波，并由单个固定压电（PZT）传感器驱动。利用局部傅里叶域分析方法对导波场数据进行处理，确定了中心频率的空间相关波数值。结果表明，导波局部波数法能够对复合材料层合板中的分层进行定位和表征。
This paper proposes a method to effectively locate and characterize mode I delamination in carbon fiber/epoxy (CF/EP) composite laminates using the local wavenumber method of propagating guided waves in a fine grid of spatial sampling points. Mode I interlaminar fracture tests were conducted using a double cantilever beam (DCB) specimen to evaluate the developed method. Wave propagation in composite laminates with delamination at different center frequencies were investigated by two-dimensional finite element (FE) simulation. The results revealed some unique mechanisms of interaction between guided wave and delamination in detail. They demonstrated that the wave propagation velocity is transformed at the delamination, and the wave attenuation and dispersion are larger with the increase of the center frequency. The guided waves were rapidly excited at each grid point using a non-contact scanning laser Doppler vibrometer (SLDV) system and actuated by a single fixed piezoelectric (PZT) sensor in the experimental study. The spatially dependent wavenumber value of the center frequency was determined by the local Fourier domain analysis method for processing guided wave filed data. The results showed that the local wavenumber method for guided waves is capable of locating and characterizing the delamination in composite laminates.
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