A Study of Stress Concentrations around Fiber Breaks in Unidirectional CF/Epoxy Composites Using Double-Fibers Fragmentation Tests

• WATANABE Jun

  Composite Material Research Laboratories, Toray Industries, Inc.

• TANAKA Fumihiko

  Composite Material Research Laboratories, Toray Industries, Inc.

• HIGUCHI Ryo

  Department of Aerospace Engineering, Tohoku University

• MATSUTANI Hiroaki

  Composite Material Research Laboratories, Toray Industries, Inc.

• OKUDA Haruki

  Composite Material Research Laboratories, Toray Industries, Inc.

• OKABE Tomonaga

  Department of Aerospace Engineering, Tohoku University

Bibliographic Information

Other Title

• ダブルファイバーフラグメンテーション試験を用いた一方向CF/エポキシ複合材料の繊維破断部近傍における応力集中係数の検討
• ダブルファイバーフラグメンテーション シケン オ モチイタ イチホウコウ CF/エポキシ フクゴウ ザイリョウ ノ センイハダンブ キンボウ ニ オケル オウリョク シュウチュウ ケイスウ ノ ケントウ

Abstract

The fiber breakage behavior of unidirectional CF/epoxy composite material was estimated taking into account the stress concentration in the adjacent fibers resulting from the matrix crack around fiber breakages. In behavior analysis of the adjacent fiber breakage in the double-fibers fragmentation tests, the simulation using the spring elements model taking into account the stress concentration in the fiber surface corresponds well with the experimental results. In addition to the introduction of the stress concentration factor, it is essential for employing the bimodal Weibull distribution which is narrow strength distribution in high strength region in order to explain the experimental behavior of the double-fibers fragmentation tests. Furthermore, the predicted tensile strength for the unidirectional CF/epoxy composite material taking into account the stress concentration to the adjacent fibers resulting from the matrix crack around fiber breakages, using the spring elements model agreed well with the experimental results. This suggests that there is considerable contribution for improving tensile strength of composites, for the suppression of stress concentration in the fiber surface.

Journal

• Journal of the Japan Society for Composite Materials

  Journal of the Japan Society for Composite Materials 42 (3), 89-97, 2016

  The Japan Society for Composite Materials

Keywords

• Carbon fiber
• Stress concentration factor
• Matrix crack
• Bimodal Weibull distribution

Details

• CRID: 1390282679598542976
• NII Article ID: 130006846400
• NII Book ID: AN00196748
• DOI: 10.6089/jscm.42.89
• ISSN: 18848559
• ISSN: 03852563
• NDL BIB ID: 027341835
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I027341835
• Web Site: https://www.jstage.jst.go.jp/article/jscm/42/3/42_89/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed