A study of stress concentrations around fiber breaks in unidirectional CF/epoxy composites using double-fiber fragmentation tests

J. Watanabe, F. Tanaka, R. Higuchi, H. Matsutani, H. Okuda, T. Okabe

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The prediction of tensile strength of unidirectional CF/epoxy composites requires appropriately determining the tensile strength distribution of carbon fibers and calculating the stress concentrations around the fiber breaks. In this study, double-fiber fragmentation tests were performed to investigate the stress concentration factor in adjacent fibers around a broken fiber. Simulation results obtained by considering the additional stress concentration due to the matrix cracks correspond well with the fiber breakage behavior observed in experiments. Furthermore, using an additional stress concentration factor and a bimodal Weibull distribution, which has a narrow strength distribution at the short gauge length, the prediction of tensile strength of the unidirectional CF/epoxy composite exhibited a good agreement with experimental results. These results showed that double-fiber fragmentation tests are a valid means of estimating the stress concentrations around fiber breaks.

Original languageEnglish
Pages (from-to)575-587
Number of pages13
JournalAdvanced Composite Materials
Volume27
Issue number6
DOIs
Publication statusPublished - 2018 Nov 2

Keywords

  • bimodal Weibull distribution
  • carbon fiber
  • matrix crack
  • stress concentration factor

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering

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