| 复合材料I形梁分层的光纤超声探测技术数值研究 |
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| 引用本文： | 许颖,喻毅,梁坚凝. 复合材料I形梁分层的光纤超声探测技术数值研究[J]. 复合材料学报, 2010, 27(3): 162-168 |
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| 作者姓名： | 许颖 喻毅 梁坚凝 |
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| 作者单位： | 哈尔滨工业大学,深圳研究生院,深圳,518055;香港科技大学,土木工程系,香港九龙 |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 针对纤维增强塑料多界面、高阻尼以及体波模式多样性对超声无损检测的影响, 介绍了一种利用光纤超声探测技术结合小波信号分析检测I 形纤维增强塑料梁中分层的方法。该方法利用超声发射器在梁中产生超声应力波, 用表面粘贴的光纤干涉仪来探测梁中应力波的传播情况, 然后利用小波的多分辨率特性对此信号进行时频分析, 结合梁中超声波的传播特性即可确定分层的位置。理论分析和模拟结果都表明了此方法探测复合材料梁腹板/翼缘连接处分层的可行性。
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| 关 键 词： | 光纤干涉仪 分层 复合材料 超声波 小波分析 |
| 收稿时间： | 2009-07-02 |
| 修稿时间： | 2009-12-26 |
Numerical study on delamination detection in I-section GFRP beam with optical fiber-based ultrasonic technique |
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| XU Ying,YU Yi,LEUNG K Y Christopher. Numerical study on delamination detection in I-section GFRP beam with optical fiber-based ultrasonic technique[J]. Acta Materiae Compositae Sinica, 2010, 27(3): 162-168 |
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| Authors: | XU Ying YU Yi LEUNG K Y Christopher |
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| Affiliation: | (1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China ;2. Department of Civil Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China) |
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| Abstract: | In order to overcome the effect s of FRP multi-interface, high damping characteristics and diversity of the body wave mode on the ultrasonic nondestructive test, a novel technique for detecting delamination is proposed. A PZT transmitter was employed to create the stress waves in the beam, and an optical fiber interferometric sensor was attached to the surface of the beam to detect the stress wave propagation in the beam. By analyzing the propagation characteristics of ultrasound and the wavelet time-frequency spectrum of the signal, the delamination location can be identified. Based on the theoretical analysis and simulation results, the feasibility of delamination detection with the proposed technique is demonst rated. |
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| Keywords: | optical fiber interferometer delamination composites ultrasonic wavelet analysis |
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