Lamb wave mode conversion and multiple-reflection mechanisms for simply and reliably evaluating delamination in composite laminates

IF 1.8 3区材料科学 Q3 MATERIALS SCIENCE, COMPOSITES

Advanced Composite Materials Pub Date : 2022-12-01 DOI:10.1080/09243046.2022.2146564

Kazuki Ryuzono, S. Yashiro, S. Onodera, N. Toyama

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引用次数: 1

Abstract

Lamb wave propagation must be understood comprehensively for simply evaluating delamination during ultrasonic testing. However, the difference between wave propagation, visualized using laser Doppler vibrometer and pulsed-laser scanners, has not been sufficiently investigated, and knowledge of optimal conditions for evaluating delamination is limited. Thus, in this study, the mode conversion and multiple reflections of Lamb waves propagating in a delaminated cross-ply laminate were visualized using different laser scanners, delamination depths, and wave incident angles. Delamination was characterized using maximum-amplitude map postprocessing under specific conditions. Further numerical analysis revealed that owing to multiple reflections of the antisymmetric mode in incident and mode-converted waves, standing waves were generated in the delaminated sublaminate. Dispersion curve and flexural stiffness calculations confirmed the conditions required for high-amplitude standing waves, thereby providing guidelines for simply and reliably evaluating delamination during inspections.

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兰姆波模式转换和多重反射机制用于简单可靠地评估复合材料层压板中的分层

为了简单地评估超声波测试过程中的分层，必须全面了解兰姆波的传播。然而，使用激光多普勒测振仪和脉冲激光扫描仪观察到的波传播之间的差异尚未得到充分的研究，并且对评估分层的最佳条件的了解有限。因此，在本研究中，使用不同的激光扫描仪、分层深度和波入射角，对在分层交叉层压板中传播的兰姆波的模式转换和多次反射进行了可视化。在特定条件下使用最大振幅图后处理来表征分层。进一步的数值分析表明，由于入射波和模转换波中反对称模的多次反射，在分层的亚层中产生了驻波。色散曲线和弯曲刚度计算证实了高振幅驻波所需的条件，从而为在检查过程中简单可靠地评估分层提供了指导。

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

Advanced Composite Materials 工程技术-材料科学：复合

CiteScore

5.00

自引率

20.70%

发文量

审稿时长

3 months

期刊介绍： "Advanced Composite Materials (ACM), a bi-monthly publication of the Japan Society for Composite Materials and the Korean Society for Composite Materials, provides an international forum for researchers, manufacturers and designers who are working in the field of composite materials and their structures. Issues contain articles on all aspects of current scientific and technological progress in this interdisciplinary field. The topics of interest are physical, chemical, mechanical and other properties of advanced composites as well as their constituent materials; experimental and theoretical studies relating microscopic to macroscopic behavior; testing and evaluation with emphasis on environmental effects and reliability; novel techniques of fabricating various types of composites and of forming structural components utilizing these materials; design and analysis for specific applications. Advanced Composite Materials publishes refereed original research papers, review papers, technical papers and short notes as well as some translated papers originally published in the Journal of the Japan Society for Composite Materials. Issues also contain news items such as information on new materials and their processing."