Demonstration of pseudo-ductility in unidirectional discontinuous carbon fibre/epoxy prepreg composites

Gergely Czél, Soraia Pimenta, Michael R. Wisnom, Paul Robinson

Research output: Contribution to journalArticle (Academic Journal)peer-review

70 Citations (Scopus)
376 Downloads (Pure)

Abstract

The inherent brittleness of continuous unidirectional fibre reinforced composites is a major drawback to their otherwise outstanding mechanical performance. This paper exploits composites with overlapped discontinuities at the ply level to create a significantly non-linear response, due to progressive interlaminar damage under tensile loading. Two distinct configurations were manufactured with the same carbon/epoxy system and tested under quasi-static tension, showing that varying the thickness and length of the overlapping ply blocks resulted in significantly different mechanical responses and failure modes. A previously developed generalised shear-lag model was successfully used to optimise the overlap configuration, and accurately predicted the response in both strength- and toughness-dominated cases. This work demonstrates that unidirectional composites with well-designed discontinuities at the ply level can provide a significantly non-linear response with clear warning before failure, while retaining similar stiffness and up to 50% of the strength of their continuous counterparts.
Original languageEnglish
Pages (from-to)110-119
Number of pages10
JournalComposites Science and Technology
Volume106
Early online date1 Nov 2014
DOIs
Publication statusPublished - 16 Jan 2015

Keywords

  • Discontinuous-ply composites
  • B. Non-linear behaviour
  • B. Delamination
  • C. Damage mechanics
  • C. Stress transfer

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