Fracture toughness and impact damage resistance of nanoreinforced Carbon/Epoxy composites

Joel S. Fenner, Isaac M. Daniel*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the objective was to develop, manufacture, and test hybrid nano/microcomposites with a nanoparticle reinforced matrix and demonstrate improvements to damage tolerance via Mode-II fracture toughness and impact damage absorption. The material employed was a woven carbon fiber/epoxy composite, with multi-wall carbon nanotubes as a nano-scale reinforcement to the matrix. A direct-mixing process, aided by a block copolymer dispersant and sonication, was employed to produce the nanoparticle-filled epoxy matrix. Fracture toughness was tested by several different Mode- II and mixed Mode-I/Mode-II specimens to determine the toughness improvement. Testing and material difficulties were overcome by this approach, showing a Mode-II toughness improvement of approx. 35% in the hybrid material. Impact tests were performed in a falling-weight drop tower at different energies to introduce interlaminar damage in samples of both materials. Impact damaged specimens were imaged by ultrasonic c-scans to assess the area of the damage zone at each ply interface. Post-mortem optical microscopy confirmed the interlaminar nature of the impact damage. These tests showed a consistently smaller absorbed energy and smaller total damage area for hybrid composite over reference material, translating to a nominally higher ‘effective impact toughness’ in the hybrid composite (approx 42%) regardless of specific impact energy.

Original languageEnglish (US)
Title of host publicationConference Proceedings of the Society for Experimental Mechanics Series
EditorsAllison M. Beese, Alan T. Zehnder, Shuman Xia
PublisherSpringer Science and Business Media, LLC
Pages213-224
Number of pages12
Edition2016
ISBN (Electronic)9783319152356, 9783319216102
DOIs
StatePublished - 2016
Event2015 SEM Annual Conference and Exposition on Experimental and Applied Mechanics - Costa Mesa, United States
Duration: Jun 8 2015Jun 11 2015

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
Number2016
Volume8
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

Conference2015 SEM Annual Conference and Exposition on Experimental and Applied Mechanics
Country/TerritoryUnited States
CityCosta Mesa
Period6/8/156/11/15

Keywords

  • Fracture toughness
  • Hybrid nano/microcomposites
  • Impact behavior
  • Nanocomposites
  • Test methods

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

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