Mode I interlaminar fracture behavior and mechanical properties of CFRPs with nanoclay-filled epoxy matrix

Naveed A. Siddiqui, Ricky S.C. Woo, Jang Kyo Kim, Christopher C.K. Leung, Arshad Munir

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297 Scopus citations


The mechanical properties and fracture behavior of nanocomposites and carbon fiber composites (CFRPs) containing organoclay in the epoxy matrix have been investigated. Morphological studies using TEM and XRD revealed that the clay particles within the epoxy resin were intercalated or orderly exfoliated. The organoclay brought about a significant improvement in flexural modulus, especially in the first few wt% of loading, and the improvement of flexural modulus was at the expense of a reduction in flexural strength. The quasi-static fracture toughness increased, whereas the impact fracture toughness dropped sharply with increasing the clay content. Flexural properties of CFRPs containing organoclay modified epoxy matrix generally followed the trend similar to the epoxy nanocomposite although the variation was much smaller for the CFRPs. Both the initiation and propagation values of mode I interlaminar fracture toughness of CFRP composites increased with increasing clay concentration. In particular, the propagation fracture toughness almost doubled with 7 wt% clay loading. A strong correlation was established between the fracture toughness of organoclay-modified epoxy matrix and the CFRP composite interlaminar fracture toughness.

Original languageBritish English
Pages (from-to)449-460
Number of pages12
JournalComposites Part A: Applied Science and Manufacturing
Issue number2
StatePublished - Feb 2007


  • A. Carbon fibre
  • A. Nano-structures
  • A. Polymer-matrix composites (PMCs)
  • B. Delamination
  • B. Fracture toughness


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