Failure mechanisms and damage evolutionin crossply ceramic-matrix composites

I. M. Daniel*, G. Anastassopoulos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Failure mechanisms were studied under the microscope in a crossply silicon carbide/glass-ceramiccomposite under axial tensile loading. Failure initiation takes place in the 90° layer. It takes the form of radial matrix cracks around the fibers, followed by interfacial cracks, which in turn coalesce into transverse macrocracks. These transverse macrocracks in the 90° layer reach a characteristic saturation crack density with a minimum crack spacing of the order of the layer thickness. Subsequently, transverse matrix cracks are generated in the 0° layer, increasing in density up to a minimum crack spacing of the order of eight fiber diameters. This stage of failure is accompanied by fiber-matrix debonding and some fiber-failures in the 0° layer. In the third stage of damage development, the macrocracks of the 90dlayer branch off and connect with the 0° layer cracks in a characteristic "delta" pattern. This is finally followed by delamination and additional cracking in the 90° layer prior to ultimate failure. The various failure mechanisms and their interactions were discussed and compared with predictions of prior experimental and analytical studies of unidirectional and crossply composites.

Original languageEnglish (US)
Pages (from-to)341-355
Number of pages15
JournalInternational Journal of Solids and Structures
Volume32
Issue number3-4
DOIs
StatePublished - Feb 1995

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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