A comparative study of a self strain-monitoring carbon nanotube film and carbon fibers under flexural loading by electrical resistance changes

11th International Conference on Damage Assessment of Structures

物理学;材料科学

Pinto, B.^1 ; Kern, S.^1 ; Ku-Herrera, J.J.^2 ; Yasui, J.^1 ; La Saponara, V.^1 ; Loh, K.J.^1

University of California, Davis, One Shields Ave, Davis

CA

95616, United States^1

Centro de Investigación Científica de Yucatán A.C., C.P. 97200, Mérida, Yucatán, Mexico^2

关键词: Carbon nanotube films;    Comparative studies;    Damage information;    Electrical resistance change;    Fiber reinforced polymer composites;    Load-carrying structure;    Multifunctional composites;    Strain monitoring;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/628/1/012098/pdf
DOI  :  10.1088/1742-6596/628/1/012098

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

With the increased use of composites for load-carrying structures, the ability to obtain strain and damage information is critical to maintain reliable structures in the field. A promising class of multifunctional composites with the ability to self-sense strain and/or damage is possible through the use of carbon fibers and carbon nanotubes. This paper presents a comparative study of two sensors for fiber-reinforced polymer composites: the sensors are the carbon fibers themselves, and a non-structural carbon nanotube (CNT) film applied through spray deposition. The changes in resistance of the sensors are compared under monotonic and cyclic flexural loading. Within the limits of this study and the current CNT sensor configuration, the carbon fibers are shown to have a higher sensitivity for strain and damage sensing. However, the CNT film appears to track the performance of GFRPs reasonably well for tensile strains.