Deformation and fracture of epoxy nanocomposites with silica inclusions

Qi Chen, I. Chasiotis, C. Chen, A. Roy

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

Abstract

The effect of silica weight fraction (1%, 3%, 5% and 15%) on the mechanical properties of a polymer nanocomposite was investigated. The composite was fabricated by dispersion of 12 nm spherical silica in Epon 862. Uniaxial tension and Single Edge Notched Tension (SENT) fracture specimens were tested with a custom-made tensile testing apparatus. Stress-strain curves were calculated by applying Digital Image Correlation (DIC) on optical images. The composite modulus increased monotonically with weight fraction. On the other hand, the ultimate strength was rather insensitive to silica weight fraction. The critical mode I stress intensity factor increased with silica weight fraction, becoming as high as 35% compared to the neat epoxy for 15 wt.% silica composites. Electron microscopy fractographs showed that the nanoparticles induced micro-flake morphologies to the fracture surface of 15% composites, which contributed to matrix toughening by enhancing matrix yielding. Voids of the size of the nanoparticles were also observed, but their extent was limited compared to surface roughening due to micro-flakes.

Original languageEnglish (US)
Title of host publicationSAMPE Fall Technical Conference and Exhibition - Multifunctional Materials
Subtitle of host publicationWorking Smarter Together, SAMPE '08
StatePublished - Dec 1 2008
Event2008 SAMPE Fall Technical Conference and Exhibition - Multifunctional Materials: Working Smarter Together, SAMPE '08 - Memphis, TN, United States
Duration: Sep 8 2008Sep 11 2008

Publication series

NameInternational SAMPE Technical Conference

Other

Other2008 SAMPE Fall Technical Conference and Exhibition - Multifunctional Materials: Working Smarter Together, SAMPE '08
CountryUnited States
CityMemphis, TN
Period9/8/089/11/08

Keywords

  • Fracture/ fracture characteristics
  • Hybrid materials/structures
  • Materials-particulates/fillers/reinforcements

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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