Maximum available tensile strength of carbon fibers

¹School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-S8-34 Ookayama, Meguro-ku, Tokyo 152-8552, Japan

²Structural Materials Research Institute, The National Institute of Advanced Industrial Science and Technology, 2266-98, Anagahora, Shimoshidami, Moriyama-ku, Nagoya, Aichi 463-8560, Japan

Adv. Mater. Lett., 2018, 9 (12), pp 885-888

DOI: 10.5185/amlett.2018.2135

Publication Date (Web): Sep 14, 2018

Copyright © IAAM-VBRI Press

E-mail: shioya.m.aa@m.titech.ac.jp

Abstract

Development of carbon fibers from alternative precursory materials through new production processes is a recent topic of active research. In such a research, the maximum available tensile strength, i. e. the tensile strength which will be achieved after elaboration to suppress defect formation during production process, is the matter of great concern. We have developed a method for determining this strength through the tensile test on a single fiber after introducing an artificial notch. In the present paper, this method has been refined. By using the refined method, the distribution of the maximum available tensile strength at various radial positions has been measured for a polyacrylonitrile-based carbon fiber. The difference between the maximum available tensile strength and the strength predicted using other methods such as those based on the fracture toughness and the fiber-length dependence of the tensile strength has also been discussed.

Keywords

Carbon fiber, tensile strength, defect, crack.