Microstructure-based modeling of the influence of particle spatial distribution and fracture on crack growth in particle-reinforced composites

A. Ayyar, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

The crack growth behavior of particle-reinforced composites is determined by several factors, such as volume fraction, particle size, particle morphology, spatial distribution and particle strength. Thus, an accurate and robust numerical model must incorporate the true microstructure of the particles. It will be shown that the strength of the reinforcement particles is also an important factor. Hence, the model must be able to simulate particle fracture. In this paper, the crack growth behavior of SiC particle-reinforced Al matrix composites was modeled using actual microstructures. Linear elastic fracture mechanics principles were used to propagate the crack and obtain the local stress intensity values. The effect of particle fracture on crack growth was studied. It will be shown that spatial distribution and shape of the particles, as well as particle fracture ahead of the crack tip, significantly affect the crack trajectory and the stress distribution at the crack tip.

Original languageEnglish (US)
Pages (from-to)6064-6073
Number of pages10
JournalActa Materialia
Volume55
Issue number18
DOIs
StatePublished - Oct 2007

Keywords

  • Crack growth
  • Finite element modeling
  • Metal-matrix composite
  • Microstructure-based modeling

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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