Stress dependent low‐frequency electrical noise in carbon fibers

Autor:	Ian L. Spain, Yves Dumont, Dinesh Patel
Rok vydání:	1992
Předmět:	Materials science Polyacrylonitrile General Physics and Astronomy Young's modulus Microstructure Noise (electronics) Stress (mechanics) Background noise chemistry.chemical_compound symbols.namesake chemistry Electrical resistivity and conductivity symbols Fiber Composite material
Zdroj:	Journal of Applied Physics. 72:1901-1905
ISSN:	1089-7550 0021-8979
Popis:	Low‐frequency (10–60 Hz) electrical noise has been measured for the first time in carbon fibers while they were subjected to tensile stress. The measurements were performed at room temperature. In all the fibers, a minimum in the noise was observed with applied stress. Low‐modulus ex‐PAN (polyacrylonitrile) fibers showed three times the increase in noise at the highest stress compared to the higher modulus fiber. Measurements were also made on vapor grown carbon fibers (VGCFs) both as‐grown and annealed. The highly graphitized VGCF showed the smallest increase in the noise with stress among the fibers studied. Our noise results can be related to the microstructure of the fibers. The fiber microstructure becomes better aligned with applied stress. Therefore, the noise would be expected to decrease. Our results, however, indicate that stress dependent noise in these fibers is caused by a combination of parameters such as fibril alignment and electronic characteristics.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e6270d6e1c4da864e1bdc931dcbc97b1 https://doi.org/10.1063/1.351664 Zobrazit plný text záznamu