碳纤维增强复合材料电磁涡流无损检测方法的并联阻抗模型分析

摘要

通过建立电涡流激励下碳纤维织物的并联阻抗模型，研究碳纤维增强复合材料（CFRP）表面不同的几何缺陷对阻抗模型中并联阻抗和谐振频率的影响。通过实验对传感器线圈几何特性进行了优化，提高了检测的准确性。实验结果表明：在并联阻抗模型中线圈探头的阻抗会随着CFRP表面的缺陷面积大小、深度的增减明显变化且呈正比关系变化，应用该方法可有效检测出具有各向异性的CFRP表而后缺陷并对缺陷进行量化。研究成果对合理评估CFRP构建服役可靠性具有参考价值。%The influence of the different geometrical defects on the surface of the carbon fiber reinforced polymer (CFRP) on the parallel impedance and resonant frequency of the parallel impedance model is studied by establishing ex-citation under the eddy current parallel impedance model of carbon fiber fabric. In this experiment , the geometry properties of the sensor coil is optimized and the precision of detection is increased. The experimental results show that the impedence of the sensor coil in the parallel impedance model is proportional to the area and depth of the surface defect on the CFRP. Using this method can effectively detect the surface defect of anisotropic CFRP and quantified the geometrical features of surface defect. The results of this research has great significance to the reasonable evaluated CFRP construct service reliability.