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首页> 外文期刊>NDT & E international >Defect detection and characterization in composite materials using square pulse thermography coupled with singular value decomposition analysis and thermal quadrupole modeling
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Defect detection and characterization in composite materials using square pulse thermography coupled with singular value decomposition analysis and thermal quadrupole modeling

机译：使用方脉冲热成像结合奇异值分解分析和热四极杆模型对复合材料中的缺陷进行检测和表征

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摘要

In this study, square pulse thermography is used to detect and characterize defects in carbon/epoxy composite plates. Defects are polymeric disks inserted between plies at different depths in the samples. A practical experimental set-up is developed: temperature measurements are only required on the front face of the samples and the heating source consists in using standard halogen lamps. A transient thermal modeling based on thermal quadrupoles and several adimensional parameters provides a one-dimensional analytical solution. Singular value decomposition analysis is used to differentiate sound and defect areas. An inversion procedure is carried out to estimate unknown parameters without any prior knowledge on sample properties or defect locations. Especially it is possible to estimate both depth and thermal resistance of the defect with reduced uncertainties. Results on the influence of the analysis and heating durations are presented. A comparison of the thermal contact quality relative to the different defects is finally performed.
机译：在这项研究中，方波热成像技术可用于检测和表征碳/环氧树脂复合板中的缺陷。缺陷是在样品中不同深度处插入层之间的聚合物圆盘。开发了一种实用的实验装置：仅在样品的前面需要进行温度测量，而加热源则使用标准的卤素灯。基于热四极杆和几个三维参数的瞬态热建模提供了一维分析解决方案。奇异值分解分析用于区分声音和缺陷区域。在没有对样品特性或缺陷位置有任何先验知识的情况下，可以执行反演程序来估计未知参数。特别地，可以以减少的不确定性来估计缺陷的深度和热阻。给出了影响分析和加热时间的结果。最后，进行相对于不同缺陷的热接触质量的比较。

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