Self-Sensing Behavior of Carbon Fiber Reinforced Carbon Matrix Composite Based on Dielectric Behavior

被引：0

作者：

Xi X. ^{[1
,2
]}

Li H. ^{[1
]}

Chen Y. ^{[1
]}

Pei J. ^{[1
]}

Liao C. ^{[1
]}

Xue L. ^{[3
]}

Chu H. ^{[1
]}

Ran Q. ^{[2
,4
]}

机构：

[1] College of Civil and Transportation Engineering, Hohai University, Nanjing

[2] State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co. Ltd., Nanjing

[3] College of Materials Science and Engineering, Hohai University, Changzhou

[4] School of Materials Science and Engineering, Southeast University, Nanjing

来源：

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2024年 / 40卷 / 05期

关键词：

carbon fiber; composites; dielectric behavior; permittivity; polarization; self-sensing;

D O I：

10.16865/j.cnki.1000-7555.2024.0090

中图分类号：

学科分类号：

摘要：

Carbon fiber reinforced carbon matrix composites (C/C) are popular due to their excellent mechanical and conductive properties, while their dielectric behavior has received little attention. The LCR meter was used to measure the relative permittivity of C/C. The resistivity was measured by current source and nanovoltage meter combined with four- probe method. The results show that the fractional change in relative permittivity per unit strain is 528±8, which is 375% higher than the fractional change in resistivity per unit strain, indicating that the dielectric behavior is more sensitive to changes in microstructures. In addition, the enhancement of dielectric behavior of C/C is due to compressive strain inducing micro defects, such as grain boundaries, interfaces, etc., that provide sites for space polarization involving a fraction of electrons and holes; on the other hand, the polarization continuity of C/C is enhanced by compression. The increase in the number of electrons and holes that participate in polarization per unit compressive strain is (1.37±0.02)×1010. The relative permittivity of C/ C is lower than both carbon fiber and graphite due to high porosity and interfaces. © 2024 Sichuan University. All rights reserved.

引用

页码：115 / 124

页数：9

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