Nonlinear elastic wave propagation and breathing-debond identification in a smart composite structure
Nonlinear elastic wave propagation and breathing-debond identification in a smart composite structure
复制标题
DOI：
10.1016/j.compositesb.2020.108304
复制
发表时间：
2020-11
影响因子：
13.1
通讯作者：
Shirsendu Sikdar;W. Paepegem;W. Ostachowicz;M. Kersemans
中科院分区：
文献类型：
--
作者：
Shirsendu Sikdar;W. Paepegem;W. Ostachowicz;M. Kersemans
本文研究了智能复合材料结构(SCS)中呼吸-脱粘现象引起的几何非线性问题。为了解决这一问题，基于弹性波传播的数值模拟和室内试验，对带底板加劲肋的SCS进行了数值模拟和实验。对数值信号和实验信号的频域分析表明，呼吸-脱键的存在产生了显著的高次谐波非线性响应。随着传播距离的增加，各次谐波的大小也发生了明显的变化。提出了一种无基线在线呼吸-解键源定位策略，该策略只利用SCSS传感器网络记录的弹性波信号二次谐波幅度的变化。这项研究进一步扩展到不同的解除粘合大小和位置。据观察，所提出的监测策略能够定位SCSS中广泛范围的呼吸-去键源。
This paper addresses a problem on geometric-nonlinearity, due to the occurrence of breathing-debond in a smart composite structure (SCS). In order to solve the problem, elastic wave propagation based numerical simulations and laboratory experiments were carried out on SCS with baseplate – stiffener debonds. The frequency-domain analysis of the numerical and experimental signals shows that the presence of breathing-debond produces a prominent nonlinear response in terms of higher-harmonics. It was also noticed that the magnitudes of those harmonics significantly change with the increase in propagation distance. A baseline-free online breathing-debond source localization strategy is proposed that exclusively uses the changes in second harmonic magnitudes of the elastic wave signals registered at the sensor-networks in SCSs. The study was further extended for variable debond sizes and locations. It is observed that the proposed monitoring strategy is capable of localizing a wide range of breathing-debond sources in the SCSs.