| 基于空耦换能器的碳纤维增强环氧树脂编织复合材料激光超声检测技术 |
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| 引用本文： | 刘旭,吴俊伟,何勇,袁懋诞,邓丽军,张永康,曾吕明,纪轩荣.基于空耦换能器的碳纤维增强环氧树脂编织复合材料激光超声检测技术[J].复合材料学报,2021,38(9):2829-2838. |
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| 作者姓名： | 刘旭 吴俊伟 何勇 袁懋诞 邓丽军 张永康 曾吕明 纪轩荣 |
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| 作者单位： | 广东工业大学 精密电子制造技术与装备国家重点实验室,广州510006;广东工业大学 精密电子制造技术与装备国家重点实验室,广州510006;江西科技师范大学 光电子与通信省重点实验室,南昌330038 |
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| 基金项目： | 广东省珠江人才计划(2016ZT06G375)；国家重点研发计划(2018YFB1107703) |
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| 摘 要： | 激光超声技术具有无需耦合剂、快速及高分辨等特点，适用于各向异性碳纤维增强树脂编织复合材料的缺陷检测。运用有限元法分析了激励位置和编织结构对激光点源激发超声波信号的影响，获得了弹性波在材料内部的传播规律以及能量分布特征，并采用1 MHz空气耦合换能器搭建了一套小型化、低成本的非接触激光超声C扫描成像系统，开展了斜纹和缎纹碳纤维增强树脂编织复合材料的近表微结构和内部缺陷检测实验。结果表明，基于空气耦合换能器的激光超声成像可以高精度地再现碳纤维增强树脂编织复合材料的近表树脂囊、碳纤维束形状、取向、尺寸及其内部缺陷等空间分布特征，有望为航空复合材料提供一种原位的微结构表征和缺陷检测方法。
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| 关 键 词： | 编织复合材料 激光超声 空耦换能器 无损检测 缺陷 |
| 收稿时间： | 2020-09-21 |
Laser ultrasonic testing technology for carbon fiber reinforced resin braided composites based on air-coupled transducer |
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| Affiliation: | 1.State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China2.Key Lab of Optic-Electronic and Communication, Jiangxi Science and Technology Normal University, Nanchang 330038, China |
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| Abstract: | Due to its non-contact, no coupling agent, fast and high resolution nature, laser ultrasonic technology has great potential in the detection of defects of anisotropic carbon fiber braided composites. In this paper, the finite element method was used to analyze the effect of the excitation position and braided structure on the ultrasonic signal excited by the laser point source, also the propagation law and energy distribution characteristics of the elastic wave inside the material were obtained. A non-contact laser ultrasonic C-scan imaging system was built based on a 1 MHz air-coupled transducer, and the experiments of near-surface micro structure and internal defect detection in plain and satin carbon fiber braided composites were carried out. The experimental results have shown that the spatial distribution characteristics of the near-surface resin capsule, carbon fiber bundle shape, orientation, size and internal defects and so on in the carbon fiber braided composites can be observed with high resolution by employing the laser air-coupled ultrasonic imaging technique. It provides an effective method of the micro structure characterization and defect detection for the aerospace composites. |
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