Fundamental Study of AE Detection in Composite Materials by Using Fiber-Optic Snesor

光纤传感器检测复合材料声发射的基础研究

• 批准号: 12650899
• 负责人: OHSAWA Isamu
• 金额: $ 1.98万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650899/
• 关键词: Fiber-Optic Sensor; AE; Composite Materials; Laser-Doppler Effect; LDV; Elastic Wave; センサー; 光ファイバー; 焼成処理

Fiber-optic sensor has excellent characteristic, for example character of low loss, wide range of frequency, light in weight, fine diameter, no induced current, and mutual directional character. Therefore the sensor provides high potential for applying health monitoring of structures. Aim of this study is whether the fiber-optic sensor has a similar function to the conventional AE sensor. First, some fundamental experiments were performed to detect signals by using fiber-optic sensor. Namely quasi AE wave was entered into a steel plate, and then the signal was detected by the fiber-optic sensor. Influence of filtered frequency range, pasting way and length of the Fiber-optic sensor on the plate, directional sensitivity of propagated signal and so on, were examined. As the result, value of S/N ratio indicated low, but activity of high amplitude signal showed similar to signal of conventional AE sensor. The fiber-optic sensor applied to tensile tests of FRP, then the high amplitude signals emitted during the loading were detected satisfactory.On the other hand, we had some experiments to examine fundamental performance of a Fiber-optic Laser-Doppler Vibro-meter (FLDV) by using a pole of steel and GFRP, in which elastic waves propagated. Influence of pasting length and pasting direct of fiber-optic sensor on the pole, and change of impact velocity were examined. As the results, FLDV has directional sensitivity, and also has high sensitivity about propagation of elastic wave from the opposite end rather than from end of a light source. It seemed there was no extension and contraction in sensor length, so it might be moving velocity of sensor end when the clastic waves were detected. The signal wave during minus acceleration became to be an attenuation wave

光纤传感器具有损耗低、频率范围宽、重量轻、直径细、无感应电流、相互定向等优良特性。因此，传感器提供了很大的潜力，用于健康监测的结构。本研究的目的是光纤传感器是否具有类似于传统的AE传感器的功能。首先，进行了光纤传感器信号检测的基础实验。即准声发射波入射到钢板上，然后由光纤传感器检测信号。研究了滤波频率范围、传感器粘贴方式、传感器长度、信号传播方向灵敏度等因素对传感器性能的影响。结果表明，声发射传感器的信噪比较低，但高幅值信号的活性与常规声发射传感器的信号相似。将光纤传感器应用于玻璃钢拉伸试验，获得了满意的高幅值信号检测结果;另一方面，利用钢杆和玻璃钢杆，对光纤激光多普勒测振仪（FLDV）的基本性能进行了实验研究，并在实验中对弹性波进行了传播。研究了光纤传感器粘贴长度和粘贴方向对杆件的影响，以及撞击速度的变化。因此，FLDV具有方向灵敏度，并且对于来自相对端而不是来自光源端的弹性波的传播也具有高灵敏度。传感器的长度没有伸缩现象，可能是在探测到碎屑波时传感器端部的移动速度。负加速度时的信号波变为衰减波

项目成果

I. Ohsawa, I. Kimpara, K. Kageyama, S. Abe, and K. Hiekata: "Acoustic Emission Characterrization and Numerical Simulation of Internal Damage Progression in"Journal of Acoustic Emission. Vol. 19. 45-52 (2001)

I. Ohsawa、I. Kimpara、K. Kageyama、S. Abe 和 K. Hiekata：《声发射杂志》中的“声发射特性和内部损伤进展的数值模拟”。

Isamu Ohsawa et al.: "Fundamental Study of Used Optical Fibers as The Reinforcement in FRP"Proceeding of The Second Asian-Australasian Conference on Composite Materials. 第2回. 1109-1114 (2000)

Isamu Ohsawa 等人：“用过的光纤作为 FRP 增强材料的基础研究”第二届亚洲-澳大利亚复合材料会议记录 1109-1114 (2000)。

Isamu Ohsawa, et al.: "Acoustic Emission Characterization and Numerical Simulation on Internal Damage Progression in CFRP Multi-Directional Symmetric Laminates"Journal of Acoustic Emission. Vol.19. 45-52 (2001)

Isamu Ohsawa 等人：“CFRP 多向对称层压板内部损伤进展的声发射特性和数值模拟”声发射杂志。

I. Ohsawa, I. Kimpara, K. Kageyama, T. Suzuki, and M. Kanai: "Fundamental Study of Used Optical Fibers as The Rein-forcement in FRP"Proceedngs of The Second Asian-Australasian Conference on Composite Materials. (ACCM-2000). 1109-1114 (2000)

I. Ohsawa、I. Kimpara、K. Kageyama、T. Suzuki 和 M. Kanai：“使用光纤作为 FRP 增强材料的基础研究”第二届亚洲-澳大利亚复合材料会议论文集。

Isamu Ohsawa, et al.: "Fundamental Study of Used Optical Fibers as The Reinforcement in FRP"Proceeding of The Second Asian-Australasian Conference on Composite Materials. 第2回. 1109-1114 (2000)

Isamu Ohsawa 等人：“用过的光纤作为 FRP 增强材料的基础研究”第二届亚洲-澳大利亚复合材料会议记录 1109-1114（2000 年）。