Microstructure-based modeling of crack growth in particle reinforced composites

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Abstract

Crack growth in particle reinforced composites is significantly influenced by the size, orientation, morphology and distribution of the reinforcement particles. Hence, to accurately model crack growth in such a system it is important that the complex microstructure of the particles be taken into account and not approximated by circles or ellipses. In this paper, the effects of particle morphology and distribution (homogeneous and clustered) on crack growth have been studied using the finite element method. The degree of particle clustering in aluminum/silicon carbide composites was quantified by the coefficient of variance in the mean near-neighbor particle spacing, and cluster size distributions obtained by an image analysis technique. Two-dimensional linear elastic fracture mechanics principles were used to propagate the crack, to obtain the local stress intensity values, and to gain an understanding of the local stress state. Predictions from these analyses were in agreement with experimental observations of crack growth in Al-SiC systems.

Original languageEnglish (US)
Pages (from-to)1980-1994
Number of pages15
JournalComposites Science and Technology
Volume66
Issue number13
DOIs
StatePublished - Oct 1 2006

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Keywords

  • A. Metal-matrix composites (MMCs)
  • A. Particle reinforced composites
  • B. Microstructure
  • C. Crack
  • C. Finite element analysis (FEA)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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