Linear damage localization in CFRP laminates using one single fiber-optic Bragg grating acoustic emission sensor
Linear damage localization in CFRP laminates using one single fiber-optic Bragg grating acoustic emission sensor
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DOI：
10.1016/j.compstruct.2020.111992
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发表时间：
2020-04-15
影响因子：
6.3
通讯作者：
Okabe, Yoji
中科院分区：
文献类型：
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作者：
Yu, Fengming;Okabe, Yoji
高灵敏度超声波光纤布拉格光栅 (FBG) 已在无损检测 (NDI) 中用作声发射 (AE) 传感器，用于分析碳纤维增强塑料 (CFRP) 层压板材料测试期间的损伤进展。损伤引起的 AE 源的定位是提高基于 AE 的 NDI 方法效率的理想功能之一。因此，我们尝试在带有高灵敏度 FBG 传感器的试件形 CFRP 测试样本中建立线性源定位方法。特别是，为了保护FBG-AE检测免受测试样本中静态应变的影响，FBG传感器采用远程粘合配置安装，即将光纤的一点粘合在样本上，光纤中的FBG传感器远离粘合点。在特定的粘合方式中，FBG 传感器通过基于光纤的超声波导检测AE 波。论文前半部分进行了超声实验，证明该安装技术能够稳定、准确地检测声发射信号中兰姆波模式的行为。借助传感特性，我们阐明了当光纤波导的长度固定时，单个AE信号中S-0和A(0)模式的到达时间差与AE源和粘附点之间的距离呈线性关系。根据检查，仅使用单个 FBG 传感器建立了线性声发射源定位方法。通过在交叉层 CFRP 层压板中进行模拟 AE 实验，确认了所提出方法的能力后，我们使用该策略在层压板的三点弯曲测试过程中定位实际损伤引起的 AE 源。
Highly sensitive ultrasonic fiber-optic Bragg gratings (FBGs) have been used as acoustic emission (AE) sensors in the non-destructive inspection (NDI) for analyzing damage progression during the material tests of carbon fiber reinforced plastic (CFRP) laminates. Localization of the damage-induced AE source is one of the desirable functions for enhancing the efficiency of the AE-based NDI method. Hence, we attempted to establish a linear source localization method in a coupon-shaped CFRP test specimen with a highly sensitive FBG sensor. In particular, to protect the FBG-AE detection from influence caused by the static strain in a test specimen, the FBG sensor was installed by a remote adhesive configuration, i.e., one point of optical fiber was glued on the specimen, and the FBG sensor in the optical fiber was located away from the adhesive point. In the particular bonding way, the FBG sensor detected AE wave through an optical-fiber-based ultrasonic waveguide. In the first half of the paper, an ultrasonic experiment was conducted to show this installation technique can stably and accurately detect the behavior of Lamb wave modes in AE signals. With the help of the sensing characteristics, we clarified that a time difference between the arrival of S-0 and A(0) modes in a one AE signal had a linear relation to the distance between the AE source and the adhesion point when the length of optical fiber-based waveguide was fixed. Based on the examination, the linear AE source localization method was established using only one single FBG sensor. After confirming the ability of the proposed approach through a simulated AE experiment in a cross-ply CFRP laminate, we used the strategy to localize the actual damage-induced AE sources during a three-point bending test of the laminate.