Strength improvement in unidirectional arrayed chopped strands with interlaminar toughening

I. Taketa, T. Okabe, A. Kitano

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The purpose of this study is to improve the strength of unidirectionally arrayed chopped strands (UACS), a sheet-like molding material made of regularly and unidirectionally arrayed discontinuous fiber strands impregnated with unsaturated thermoset resin. In a previous paper, we found that the final failure of UACS laminates is mainly controlled by the onset of unstable delamination growth. This paper presents interlaminar toughening of UACS laminates as a means of suppressing delamination. Specifically, we applied the following three approaches to toughening: (1) toughening the matrix resin itself, (2) inserting a toughened interlaminar layer, and (3) localizing the toughened layer only around the ends of the chopped strands. As a result, we demonstrate a tensile strength improvement of up to about 20%.

Original languageEnglish
Pages (from-to)1174-1178
Number of pages5
JournalComposites Part A: Applied Science and Manufacturing
Issue number8
Publication statusPublished - 2009 Aug 1


  • A. Polymer-matrix composites (PMCs)
  • B. Fracture toughness
  • B. Strength
  • E. Compression molding

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials

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