Delamination thickness measurement based on Stoneley wave in bilayered composite structure

IF 1 3区 物理与天体物理 Q4 ACOUSTICS
Tao Zhou, Ming-hang Li, Bing Li
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引用次数: 0

Abstract

Introduction : For composite structures, delamination usually occurs at the interface. Ultrasonic guided waves have been widely used to detect the delamination. However, most researches focus on the measurement of the delamination length along the interface, and the measurement of the delamination thickness is less studied. Method : In this paper, based on the characteristic that the Stoneley wave only propagates along the interface, the reflection coefficient of interaction between Stoneley wave and delamination is used to measure the delamination thickness. The effects of delamination thickness and frequency on the reflection coefficient are investigated via dividing integral region and reciprocity theorem. Some experimental validations are carried out on two aluminum-steel bilayered composite plates with different delamination thickness. Results : It is found the reflection coefficient increases linearly at first, then its rate of increase slows down gradually, and finally becomes stable, in theory. And the experimental results can verify the theoretical relationship between the reflection coefficients and the delamination thickness. Conclusion : The variation of reflection coefficient provides a reference for the measurement of delamination thickness in Stoneley-wave-based non-destructive testing.
基于斯通利波的双层复合材料分层厚度测量
简介:对于复合材料结构,脱层通常发生在界面处。超声导波已被广泛应用于分层检测。然而,大多数研究都集中在沿界面的分层长度的测量上,而对分层厚度的测量研究较少。方法:本文根据斯通利波仅沿界面传播的特点,利用斯通利波与脱层相互作用的反射系数来测量脱层厚度。利用积分区划分和互易定理,研究了分层厚度和频率对反射系数的影响。对两种不同分层厚度的铝-钢双层复合材料板进行了实验验证。结果:从理论上讲,反射系数先线性增加,然后增加的速度逐渐减慢,最后趋于稳定。实验结果验证了反射系数与分层厚度之间的理论关系。结论:反射系数的变化为斯通利波无损检测中分层厚度的测量提供了参考。
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
Acta Acustica
Acta Acustica ACOUSTICS-
CiteScore
2.80
自引率
21.40%
发文量
0
审稿时长
12 weeks
期刊介绍: Acta Acustica, the Journal of the European Acoustics Association (EAA). After the publication of its Journal Acta Acustica from 1993 to 1995, the EAA published Acta Acustica united with Acustica from 1996 to 2019. From 2020, the EAA decided to publish a journal in full Open Access. See Article Processing charges. Acta Acustica reports on original scientific research in acoustics and on engineering applications. The journal considers review papers, scientific papers, technical and applied papers, short communications, letters to the editor. From time to time, special issues and review articles are also published. For book reviews or doctoral thesis abstracts, please contact the Editor in Chief.
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