Large-field detection of Metal/CFRP hybrid composites based on air-coupled laser ultrasound

IF 6.5 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composites Communications Pub Date : 2024-11-20 DOI:10.1016/j.coco.2024.102174
Bainian Long , Zhongwen Cheng , Weisheng Liao , Junwei Wu , Lvming Zeng , Xuanrong Ji
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Abstract

Metal/carbon fiber reinforced polymer (CFRP) hybrid composites are widely used in the aeronautical and aerospace industry due to their excellent mechanical properties. However, traditional nondestructive testing methods are difficult to achieve fast, non-contact, large-field, high resolution, and high contrast detection at the same time, due to the large differences in thickness, density, acoustic impedance, and thermal diffusion between metal and fiber layers. Here, an air-coupled laser ultrasound (ACLU) method was presented for large-field detection of internal defects on the non-homogeneous metal/CFRP interface. Simulation analysis was conducted to analyze the propagation characteristics of laser ultrasound in Al/CFRP hybrid composites without defect and with defect. Test results for ACLU system display that the maximum imaging field of view is 300 mm × 75 mm at the frame rate of 1.5 s/frame. Under a 0.3 mm metal layer, the detecting resolution of the system can still reach up to 200 μm. The system was applied to detect three types of crack and disbond defects of metal/CFRP hybrid composites, and making a side-by-side comparison with phased array ultrasonic testing (PAUT) and radiographic testing (RT). The C-scan results show that the constructed system obtains a high signal-to-noise ratio (SNR) of 23 dB, which improves 4 times and 20 times compared with PAUT and RT, respectively. It indicates that the developed ACLU system hold a great prospect in non-contact large-field inspection of metal/CFRP hybrid composites.
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基于空气耦合激光超声的金属/CFRP 混合复合材料大场探测
金属/碳纤维增强聚合物(CFRP)混合复合材料因其优异的机械性能而被广泛应用于航空航天领域。然而,由于金属和纤维层之间在厚度、密度、声阻抗和热扩散方面存在较大差异,传统的无损检测方法很难同时实现快速、非接触、大视场、高分辨率和高对比度检测。本文介绍了一种空气耦合激光超声(ACLU)方法,用于非均质金属/CFRP 界面内部缺陷的大视场检测。模拟分析了激光超声波在无缺陷和有缺陷的 Al/CFRP 混合复合材料中的传播特性。ACLU 系统的测试结果表明,在 1.5 秒/帧的帧速率下,最大成像视场为 300 mm × 75 mm。在 0.3 毫米的金属层下,系统的检测分辨率仍可达 200 μm。该系统被用于检测金属/CFRP 混合复合材料的三种裂纹和脱粘缺陷,并与相控阵超声波检测(PAUT)和射线检测(RT)进行了对比。C 扫描结果表明,所构建的系统可获得 23 dB 的高信噪比 (SNR),与 PAUT 和 RT 相比分别提高了 4 倍和 20 倍。这表明所开发的 ACLU 系统在金属/CFRP 混合复合材料的非接触式大场检测方面具有广阔的前景。
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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