Piezoresistivity of unidirectional carbon/epoxy composites for multiaxial loading
Piezoresistivity of unidirectional carbon/epoxy composites for multiaxial loading
复制标题
DOI：
10.1016/j.compscitech.2009.03.023
复制
发表时间：
2009-09-01
影响因子：
9.1
通讯作者：
Matsuzaki, Ryosuke
中科院分区：
文献类型：
--
作者：
Todoroki, Akira;Samejima, Yusuke;Matsuzaki, Ryosuke
碳纤维增强塑料（CFRP）的外加应变可以通过其电阻变化来测量。对于层压碳纤维复合材料的损伤监测，压阻率强烈影响测得的电阻变化，通过残余应变释放归因于分层裂纹。虽然已经发表了几项关于CFRP层压板压阻率的研究，但本研究使用单层CFRP在四个方向上进行特定压阻率测量。通过对面内压阻理论的回顾，揭示了CFRP压阻的正交各向异性特性。本文推导了多轴加载的压阻率，并利用实测的压阻率计算了非对称压阻矩阵。本文还讨论了多轴载荷对错位单向层合板的影响。在拉伸试验过程中，错位的层压板在横向方向上引起大的收缩;电极处的不良电接触增加了横向方向上的电流;这两种效应导致具有大纤维错位的不良电接触试样的电阻降低。(C)2009爱思唯尔有限公司保留所有权利。
The applied strain of carbon fibre reinforced plastics (CFRPs) is measurable by their electrical resistance changes. For damage monitoring of laminated CFRPs, piezoresistivity strongly affects the measured electrical resistance change through residual strain relief attributable to delamination cracks. Although several studies of CFRP laminates' piezoresistivity have been published, this study uses single-ply CFRP for specific piezoresistivity measurements in four directions. A review of the theory of in-plane piezoresistivity reveals orthotropic properties of CFRP piezoresistivity. In the present study, piezoresistivity of multiaxial loading is derived, and the unsymmetrical piezoresistivity matrix is calculated using the measured piezoresistivity here. Effects of multiaxial loading in a misaligned unidirectional laminate are also discussed here. The misaligned laminate causes large shrink in the transverse direction during tensile tests; poor electrical contacts at electrodes increases the electric current in the transverse direction; these two effects cause decrease of electrical resistance for the poor electrical contact specimen with large fibre misalignment. (C) 2009 Elsevier Ltd. All rights reserved.