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Flying Laser Spot Thermography technique for the NDE of Fibre Metal Laminates disbonds

机译:用于金属纤维层压板无损检测的飞点激光热成像技术

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The present work investigates the features of an active Infrared-NDT Thermography technique derived from a Flying Laser Spot set-up for the analysis of interlaminar disbonds in layered structures in general and Fibre Metal Laminates in particular. The presented technique uses a laser-spot heat source, which moves at a constant speed, raster scanning the object surface. Interlaminar defects parallel to the surfaces act as barriers towards through-the-thickness heat diffusion. This produces some modifications over the surface thermal field which are well identified in the Standard Deviation calculated over a Reference Area following the heat source. The mechanisms leading to such defect signature are investigated in this work by means of Finite Element Analyses which model the dynamic thermal problem on a GLARE sample with triangular disbond defects at inner interfaces. An extended number of parameters is changed to study their influence on the defect signature, and the FEA analysis is also compared to an analytical and an experimental case studies for further validation. (C) 2017 Elsevier Ltd. All rights reserved.
机译:本工作调查了从飞行激光点设置派生的主动红外NDT热成像技术的特征,该技术用于分析一般层状结构中的层间剥离,尤其是纤维金属层压板。提出的技术使用激光点热源,该激光点热源以恒定的速度移动,光栅扫描对象表面。平行于表面的层间缺陷会阻碍整个厚度的热扩散。这会在表面热场上产生一些变化,这些变化在热源后参考区域上计算出的标准偏差中可以很好地识别。在这项工作中,通过有限元分析对导致这种缺陷签名的机制进行了研究,该有限元分析对内部界面处具有三角形脱粘缺陷的GLARE样品上的动态热问题进行了建模。更改大量参数以研究其对缺陷特征的影响,并且还将FEA分析与分析和实验案例研究进行比较,以进行进一步验证。 (C)2017 Elsevier Ltd.保留所有权利。

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