Delamination detection in CFRP laminates using FOD sensor
Delamination detection in CFRP laminates using FOD sensor
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DOI：
10.1117/12.839673
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发表时间：
2009-07
期刊：
影响因子：
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通讯作者：
Fucai Li;K. Kageyama;H. Murayama;I. Ohsawa
中科院分区：
文献类型：
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作者：
Fucai Li;K. Kageyama;H. Murayama;I. Ohsawa
在本文中，碳纤维增强塑料（CFRP）层压板（原始和分层）的损伤评估的目的。将新近开发的基于多普勒效应的光纤传感器粘贴在每个CFRP层合板的表面上，以获取压电陶瓷盘激励的导波在试件中的传播。利用线性相位有限冲激响应滤波和希尔伯特变换两种成熟的信号处理算法，对采集到的导波信号进行特征提取，研究分层对导波传播的影响。当导波入射在不连续性上时，由于满足沿不连续性沿着的边界条件，可能发生模式转换。利用多模态导波的频散特性和导波产生的基本水平剪切波（SH0）的特性，对结构进行损伤评估和多损伤检测。实验结果表明，由于FOD传感器在超声波检测中的全向性，该传感器在CFRP层合板的多处分层检测中是有效的。
In this paper, carbon fiber reinforced plastic (CFRP) laminates (pristine and delaminated) are addressed for the purpose of damage assessment. Recently developed Doppler effect-based fiber optic (FOD) sensor was bonded on surface of each CFRP laminate to acquire piezoceramic-disc-excited guided waves propagating in the specimen. Characteristics of the captured guided wave signals were extracted by taking advantage of two well-developed signal processing algorithms, namely, linear-phase finite impulse response filter and Hilbert transform, so as to investigate the influence of the delaminations to the guided wave propagation. When guided waves are incident on discontinuities, mode conversion may occur as a result of satisfying the boundary conditions along the discontinuities. Both the dispersive characteristics of multi-mode guided waves and features of the guided-wave-generated fundamental shear horizontal (SH0) wave were applied for damage evaluation and multiple-damage detection. The results demonstrate that the FOD sensor is effective in multiple delamination detection for CFRP laminates because of its omnidirectional property in ultrasonic detection.