Damage detection in CFRP by electrical conductivity mapping
Damage detection in CFRP by electrical conductivity mapping
复制标题
DOI：
10.1016/s0266-3538(00)00178-0
复制
发表时间：
2001-01-01
影响因子：
9.1
通讯作者：
Schulte, K
中科院分区：
文献类型：
--
作者：
Schueler, R;Joshi, SP;Schulte, K
碳纤维增强聚合物（CFRP）复合材料具有优异的机械强度、刚度和导电性。机械变形和电阻耦合在这些纤维中，使它们成为固有的传感器。因此，碳纤维复合材料可以被认为是一种自监测材料，而不需要任何额外的传感元件。然而，要实现这一点，需要构建整个结构的电导率图，并建立电导率与各种使用和损坏相关变量之间的关系。实验结果表明，内部损伤，如纤维断裂和分层，降低复合材料层合板的导电性。通常，电阻抗成像（EIT）可以获得损伤的大小和位置信息，但当介质具有高度各向异性的电导率时，传统的EIT无法提取这些信息。在一定水平的各向异性之上，修改传统的EIT是有利的。提出了一种高正交异性（单向）CFRP损伤尺寸和位置的提取方法。无需复杂的计算即可获得结果，从而能够真实的实时进行损伤检测。实验观察表明，一个实用的EIT有可能成为一个具有成本效益的健康和使用监测技术（HUMT）CFRP。(C)2001爱思唯尔科技有限公司版权所有。
Carbon-fiber-reinforced polymer (CFRP) composites derive their excellent mechanical strength, stiffness and electrical coductivity from carbon fibers. The mechanical deformation acid electrical resistance are coupled in these fibers that make them inherently sensors. Thus CFRPs can be considered as a self-monitoring material without any need for additional sensing elements. However, for this to become reality the conductivity map of the entire structure needs to be constructed and the relationships between the conductivity and various use- and damage-related variables need to be established. Experimental results demonstrate that internal damage, such as fiber fracture and delamination, decreases the conductivity of composite laminates. In general, the information about the damage size and position can be obtained by utilizing electrical impedance tomography (EIT), but the traditional EIT is not capable of extracting this information when the medium possesses highly anisotropic electrical conductivity. Above a certain level of anisotropy, it is advantageous to modify the traditional EIT. This paper presents a method of extracting the damage size and position for highly orthotropic (unidirectional) CFRPs. The results are obtained without the need for complex calculations, thus enabling damage detection in real time. Experimental observations indicate that a practical EIT has a potential of being a cost-effective health and usage monitoring technique (HUMT) for CFRPs. (C) 2001 Elsevier Science Ltd. All rights reserved.