Hybrid composites of aligned discontinuous carbon fibers and self-reinforced polypropylene under tensile loading

Jun Tang*, Yentl Swolfs, Marco Longana, HaNa Yu, Michael Wisnom, Stepan V. Lomov, Larissa Gorbatikh

*Corresponding author for this work

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

10 Citations (Scopus)
38 Downloads (Pure)


Highly aligned discontinuous fiber composites have demonstrated mechanical properties comparable to those of unidirectional continuous fiber composites. However, their ductility is still limited by the intrinsic brittleness of the fibers and stress concentrations at the fiber ends. Hybridization of aligned discontinuous carbon fibers (ADCF) with self-reinforced polypropylene (SRPP) is a promising strategy to achieve a balanced performance in terms of stiffness, provided by the ADCF, and ductility, delivered by SRPP. The current work focuses on interlayer hybridization of these materials and their tensile behavior as a function of different material parameters. Effects of the carbon layer thickness, carbon/SRPP layer thickness ratio, layer dispersion and interface adhesion are investigated. The carbon fiber misalignment is characterized using X-ray computed tomography to predict the modulus of the aligned discontinuous carbon fiber layer. The hybrids exhibit a gradual tensile failure with high pseudo-ductile strain of above 10% facilitated by multiple carbon layer failures (layer fragmentation) and dispersed delaminations. At the microscopic scale, the carbon layer fails mainly through interfacial debonding and fiber pull-out.

Original languageEnglish
Pages (from-to)97-107
Number of pages11
JournalComposites Part A: Applied Science and Manufacturing
Early online date7 May 2019
Publication statusPublished - 1 Aug 2019

Structured keywords

  • Bristol Composites Institute ACCIS


  • Discontinuous reinforcement
  • Hybrid
  • Fragmentation
  • Delamination

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