Estimate of carbon fiber’s fracture toughness based on the small angle X-ray diffraction

Estimate of carbon fiber’s fracture toughness based on the small angle X-ray diffraction According to the Weibull theory, the micropore sizes were used to analyze the stress intensity factor of carbon fiber monofilament crack tip stress field. Based on the analysis of carbon fiber monofilament and multifilament tensile strength, diameter and micropore size get the relationship between carbon fiber monofilament tensile strength and the pore radius by the Guinier principle and Griffith fracture theory, thus to estimate carbon fiber fracture toughness. The results show that this method can implement the estimation of fracture toughness on the basis without destroying the structure of the carbon fibers; the fracture toughness of T300 estimated by the average pore size was 1.34 MPa·m1/2, in accordance with data 1.25 and 1.32 MPa·m1/2 by producing defects, errors are 7.2 and 1.5%, respectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Polymer Bulletin Springer Journals

Estimate of carbon fiber’s fracture toughness based on the small angle X-ray diffraction

Estimate of carbon fiber’s fracture toughness based on the small angle X-ray diffraction

Polym. Bull. (2017) 74:4143–4151 DOI 10.1007/s00289-017-1941-2 ORIGINAL PAPER Estimate of carbon fiber’s fracture toughness based on the small angle X-ray diffraction 1 1 2 • • Meiling Wang Wenfeng Bian Zhaochun Jiang Received: 27 July 2016 / Revised: 9 October 2016 / Accepted: 8 February 2017 / Published online: 22 February 2017 Springer-Verlag Berlin Heidelberg 2017 Abstract According to the Weibull theory, the micropore sizes were used to ana- lyze the stress intensity factor of carbon fiber monofilament crack tip stress field. Based on the analysis of carbon fiber monofilament and multifilament tensile strength, diameter and micropore size get the relationship between carbon fiber monofilament tensile strength and the pore radius by the Guinier principle and Griffith fracture theory, thus to estimate carbon fiber fracture toughness. The results show that this method can implement the estimation of fracture toughness on the basis without destroying the structure of the carbon fibers; the fracture toughness of 1/2 T300 estimated by the average pore size was 1.34 MPam , in accordance with 1/2 data 1.25 and 1.32 MPam by producing defects, errors are 7.2 and 1.5%, respectively. Keywords Carbon fiber  SAXS  Griffith  Fracture toughness  Crack Introduction Carbon fibers belong to brittle materials; their structure is imperfect because of random distribution defects of different sizes in the surface and internal which significantly affect the mechanical properties of composite materials [1]. The stress intensity factor, K , is one of the fundamental properties of carbon fibers and wildly used for composites. In linear-elastic fracture mechanics, K are important parameters for estimating crack propagation or calculating crack growth rate. Irwin [2] gave the stress and strain distribution near the crack tip on the basis of Griffith & Meiling Wang wangml_hit@163.com College of Aerospace, Harbin Institute of Technology,...
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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Chemistry; Polymer Sciences; Soft and Granular Matter, Complex Fluids and Microfluidics; Characterization and Evaluation of Materials; Physical Chemistry; Organic Chemistry
ISSN
0170-0839
eISSN
1436-2449
D.O.I.
10.1007/s00289-017-1941-2
Publisher site
See Article on Publisher Site

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