High-precision measurement of crack length and angle in structural materials using point-focused electromagnetic ultrasound

IF 5.6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Pub Date : 2025-10-06 DOI:10.1016/j.measurement.2025.119190

Jun Tu , Xin Shen , Hongjun Zhou , Yini Song , Zhiyang Deng , Xiaochun Song

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引用次数: 0

Abstract

Crack detection and quantitative evaluation in aircraft aluminum plate structures hold significant application value in aerospace engineering. However, existing non-contact inspection techniques face limitations in achieving high-precision measurements, particularly in terms of crack length and angle estimation. To address this challenge, this study focuses on fatigue cracks propagating from the surface into the interior of metallic plates and proposes a crack characterization method based on point-focused electromagnetic acoustic transducer (PF-EMAT) technology. The method utilizes point-focused surface waves generated by electromagnetic ultrasound, and accurately calculates the crack inclination by analyzing wave propagation characteristics and applying geometric principles. Meanwhile, the crack length is quantitatively measured using a relative sensitivity approach, enabling precise evaluation of crack geometry. Experimental results demonstrate that this method can effectively detect cracks with lengths of 10 mm or more and angles ranging from 0° to 90°, while maintaining length measurement errors within 0.2 mm and angle errors within 1°. The findings confirm the reliability of PF-EMAT technology in non-contact geometric crack characterization, offering a novel solution for the structural health monitoring of plate-like components.

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点聚焦电磁超声对结构材料裂纹长度和角度的高精度测量

飞机铝板结构裂纹检测与定量评价在航空航天工程中具有重要的应用价值。然而，现有的非接触检测技术在实现高精度测量方面面临局限性，特别是在裂纹长度和角度估计方面。为了解决这一挑战，本研究将重点放在从金属板表面向内部传播的疲劳裂纹上，并提出了一种基于点聚焦电磁声换能器（PF-EMAT）技术的裂纹表征方法。该方法利用电磁超声产生的点聚焦表面波，通过分析波的传播特性，应用几何原理，精确计算出裂纹倾角。同时，使用相对灵敏度方法定量测量裂纹长度，从而能够精确评估裂纹几何形状。实验结果表明，该方法可以有效检测长度在10mm以上、角度在0°~ 90°的裂纹，长度测量误差在0.2 mm以内，角度测量误差在1°以内。研究结果证实了PF-EMAT技术在非接触几何裂纹表征中的可靠性，为板状构件的结构健康监测提供了一种新的解决方案。

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

Measurement 工程技术-工程：综合

CiteScore

10.20

自引率

12.50%

发文量

1589

审稿时长

12.1 months

期刊介绍： Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.