Nondestructive Testing of Thin Composite Structures for Subsurface Defects Detection Using Dynamic Laser Speckles

IF 1 4区材料科学 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Research in Nondestructive Evaluation Pub Date : 2022-03-04 DOI:10.1080/09349847.2022.2049407

Z. Nazarchuk, L. Muravsky, O. Kuts

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引用次数: 2

Abstract

ABSTRACT A novel nondestructive testing method for subsurface defects detection in thin composite structures using dynamic laser speckles is proposed. In this method, a laminated composite panel containing a subsurface defect is excited by a frequency scanned ultrasonic (US) wave and is illuminated by an expanded laser beam. If one of resonant frequencies of the defect coincides with the US frequency, a local area (a region of interest or ROI) of the panel optically rough surface, placed directly above the defect, begins to vibrate, and the sequences of difference speckle patterns containing the spatial response from the defect are recorded. The formation of this response is caused by both decorrelation and speckle blurring within the local speckle pattern generated by the vibrating ROI at its opposite tilts. The accumulation of difference speckle patterns increases the intensity of the spatial response. This method differs from similar ones in that defects are detected using dynamic speckle patterns of a composite rough surface, illuminated by a single expanded laser beam. The verification of the proposed method was performed using a hybrid optical-digital experimental breadboard to test composite panels containing artificial subsurface defects, as well as a real defect.

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基于动态激光散斑的薄复合材料结构亚表面缺陷无损检测

提出了一种利用动态激光散斑检测复合材料薄型结构亚表面缺陷的新方法。在这种方法中，含有亚表面缺陷的层压复合材料板由频率扫描超声波(US)波激发，并由扩展激光束照射。如果缺陷的谐振频率之一与US频率一致，则直接放置在缺陷上方的面板光学粗糙表面的局部区域(感兴趣区域或ROI)开始振动，并记录包含缺陷空间响应的差异散斑图案序列。这种响应的形成是由在其相反倾斜处振动的ROI产生的局部散斑模式内的去相关和散斑模糊引起的。不同散斑模式的积累增加了空间响应的强度。该方法与同类方法的不同之处在于，该方法是使用单个扩展激光束照射复合粗糙表面的动态散斑模式来检测缺陷。利用光学数字混合实验面包板对含有人工亚表面缺陷和真实缺陷的复合材料板进行了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Research in Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Research in Nondestructive Evaluation® is the archival research journal of the American Society for Nondestructive Testing, Inc. RNDE® contains the results of original research in all areas of nondestructive evaluation (NDE). The journal covers experimental and theoretical investigations dealing with the scientific and engineering bases of NDE, its measurement and methodology, and a wide range of applications to materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Illustrative topics include advances in the underlying science of acoustic, thermal, electrical, magnetic, optical and ionizing radiation techniques and their applications to NDE problems. These problems include the nondestructive characterization of a wide variety of material properties and their degradation in service, nonintrusive sensors for monitoring manufacturing and materials processes, new techniques and combinations of techniques for detecting and characterizing hidden discontinuities and distributed damage in materials, standardization concepts and quantitative approaches for advanced NDE techniques, and long-term continuous monitoring of structures and assemblies. Of particular interest is research which elucidates how to evaluate the effects of imperfect material condition, as quantified by nondestructive measurement, on the functional performance.