Experimental determination of probabilistic edge-delamination strength of a graphite-fiber/epoxy composite

Xiang Fa Wu, Yuris A. Dzenis

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Probabilistic edge-delamination strength of a thermosetting polymer composite was studied experimentally in this work. During the procedure, by means of edge-delamination tensile test, the graphite-fiber/epoxy laminate made of unidirectional Toray P7051S-20Q-1000 prepregs with an optimized lay-up of [122/-122/ 02]S was used for examining its probabilistic distributions of the edge-delamination onset stress and the ultimate tensile strength. Acoustic emission (AE) equipment and optical microscope were utilized to capture the edge-delamination initiation and characterize the failure modes during delaminating. Fractographical analysis based on scanning electron microscope (SEM) was conducted for the characterization of the microscopic failure mechanisms of the composite laminate during edge delaminating. Probabilistic models were introduced for data reduction. Test results show that the edge-delamination onset stress and the ultimate tensile strength of the laminate tested satisfy two two-parameter Weibull distributions very well. AE signals show the main failure mode during edge delaminating is interlaminar shear failure, corresponding to that predicted by numerical simulation and confirmed by SEM fractographical results in this study.

Original languageEnglish (US)
Pages (from-to)100-108
Number of pages9
JournalComposite Structures
Volume70
Issue number1
DOIs
StatePublished - Aug 2005

Keywords

  • Acoustic emission (AE)
  • Edge delamination
  • Edge-delamination onset stress
  • Free-edge stresses
  • Graphite-fiber/epoxy composite
  • Probabilistic strength
  • SEM fractographical analysis
  • Weibull distribution

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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