On the feasibility of defect detection in composite material based on thermal periodic excitation
On the feasibility of defect detection in composite material based on thermal periodic excitation
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DOI：
10.1016/j.compositesb.2012.07.020
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发表时间：
2013-02
影响因子：
13.1
通讯作者：
B. Lascoup;L. Perez;L. Autrique;A. Crinière
中科院分区：
文献类型：
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作者：
B. Lascoup;L. Perez;L. Autrique;A. Crinière
实施周期性热激励来识别不同研究尺度（从微米到毫米）的复杂复合材料的热性能（传导率、热容、扩散率）具有许多优点。这些方法通常基于与参考信号相比的热波相位滞后观察。事实上，相位滞后演化与热源距离或激励频率的关系可以提供有关许多材料特性的丰富信息。例如，考虑到结构缺陷可以改变材料内部的热传播，可以通过相位滞后观察以及有缺陷和无缺陷样品之间的比较来进行诊断。考虑到全局加热（所研究的复合材料的相当大的表面被加热并且可以检测缺陷深度或尺寸），已经进行了大量研究。所提出的方法是原创的，因为周期性加热是局部的，并且旨在检测激励外围的缺陷。基于热波传播的数学模型并引入复杂温度进行数值分辨率（有限元法），可行性研究允许进行敏感性分析。这项初步研究还提供了有关加热（频率、功率、源尺寸）和观察（透射或反射）的操作协议的信息。然后，简要展示了实验装置和早期实验结果。
Implementation of periodic thermal excitation to identify thermal properties (conductivity, heat capacity, diffusivity) of complex composite materials at different investigation scales (from micrometer to millimetre) presents many advantages. These methods are usually based on the thermal waves phase lag observation compared to a reference signal. In fact, phase lag evolution versus distance to the heating source or versus excitation frequency is quite informative about numerous material characteristics. For example, considering that a structural defect can modify heat propagation inside a material, diagnosis can be performed from phase lag observations and comparisons between samples with and without defects. Numerous studies have been performed considering global heating (a quite large surface of the investigated composite material is heated and defect depth or size can be detected). The proposed approach is original since periodic heating is local and aims to detect defects in the periphery of the excitation. Based on a mathematical model for thermal waves propagations and introducing complex temperature for numerical resolution (finite element method), a feasibility study has allowed a sensitivity analysis. This preliminary study also provides information on the operating protocol, for heating (frequency, power, size of the source), and observation (transmission or reflection). Then, experimental device and early experimental results are briefly exposed.