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首页> 外文期刊>Journal of Nondestructive Evaluation >Dynamic Thermal Tomography of Composites: A Comparison of Reference and Reference-Free Approaches
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Dynamic Thermal Tomography of Composites: A Comparison of Reference and Reference-Free Approaches

机译:复合材料动态热断层扫描:参考和无参考方法的比较

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摘要

Dynamic thermal tomography is a technique that allows the display of "slices" of solids by analyzing the evolution of surface temperature as a function of time. This paper presents the principles of one-sided thermal tomography using reference points and also introduces a technique of thermal tomography that does not require the use of reference point. The diffusion nature of heat conduction in solids causes lateral diffusion, which modifies and complicates the heat flow that is needed to detect defects. In the case of anisotropic composite materials the heat will diffuse more readily in one direction than another. Lateral diffusion can make it difficult to detect (visualize) deep defects, especially those located under shallower ones. Artifacts can be reduced by thresholding timegrams but this may hide small defects. The effectiveness of thermal tomography in detecting impact damage (cracks/delaminations) in composites has been confirmed by numerous experiments.
机译:动态热断层扫描是一种技术,可以通过分析表面温度的演变作为时间的函数来显示固体的“切片”。 本文介绍了使用参考点的单面热断层扫描的原理,并引入了一种不需要使用参考点的热断层扫描技术。 固体中的热传导的扩散性质导致横向扩散,其改变并使检测缺陷所需的热流复杂化。 在各向异性复合材料的情况下,热量将在一个方向上比另一个方向更容易地扩散。 横向扩散可以使其使得难以检测(可视化)深缺陷,特别是那些位于较浅的缺陷。 通过阈值调时可以减少伪影,但这可能隐藏小缺陷。 通过许多实验证实了热断层扫描在复合材料中检测冲击损伤(裂缝/分层)的有效性。

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