Numerical analysis of correlation between fibre orientation and eddy current testing signals of carbon-fibre reinforced polymer composites
Numerical analysis of correlation between fibre orientation and eddy current testing signals of carbon-fibre reinforced polymer composites
复制标题
碳纤维增强聚合物复合材料纤维取向与涡流检测信号相关性的数值分析
DOI：
10.3233/jae-2012-1468
复制
发表时间：
2012-01-01
影响因子：
0.6
通讯作者：
Hu, Ning
中科院分区：
文献类型：
--
作者：
Cheng, Jun;Qiu, Jinhao;Hu, Ning
本文采用边缘单元有限元程序对碳纤维增强聚合物复合材料涡流试验进行了模拟。有限元程序基于A公式，采用外场耦合分析。计算了单向层CFRP板中纤维取向和裂纹对线圈阻抗的影响。CFRP的电导率具有低值和高各向异性的特点，这使得CFRP与各向同性金属ECT信号存在明显差异。得到了纤维取向与线圈阻抗变化的相关性，但由于信号的对称性，无法确定复合材料板中纤维的准确排列。本研究提出了另一种通过边缘效应确定纤维取向的方法。数值结果表明，CFRP板的裂纹形状很难从检测信号曲线中得到，除非纤维取向与裂纹路径垂直。
This paper deals with eddy current testing simulation for carbon-fibre reinforced polymer composites (CFRPs) using an edge - element FEM code. The FEM code is based on the A formulation and it uses the coupled analysis with external fields. The coil impedance variations due to the fibre orientation and cracks in CFRP plates with unidirectional plies are computed. The conductivity of CFRP is characterized as low value and high anisotropy, which cause the distinct difference between CFRP and isotropic metal ECT signals. The correlation of the fibre orientation with coil impedance variations is obtained, but the exact fibre arrangement in a composite plate can't be ascertained because of signal symmetry. Another method for determining the fibre orientation via the edge effect is presented in this study. According to the numerical results, the shape of cracks in a CFRP plate is not easily evaluated from the detection signal curves unless the fibre orientation is perpendicular to the crack path.