Transverse cracking in metal/ceramic composites with lamellar microstructure

Research output: Contribution to journalArticle

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Abstract

Metal/ceramic composites with lamellar microstructures are a novel class of metal-matrix composites produced by infiltration of freeze-cast or ice-templated ceramic preforms with molten aluminium alloy. The cost-effectiveness of production and relatively high ceramic content make such composites attractive to a number of potential applications in the automotive, aerospace and biomedical engineering. A hierarchical lamellar microstructure exhibited by these composites, with randomly orientated domains in which all ceramic and metallic lamellae are parallel to each other, is the result of the ice crystal formation during freeze-casting or ice templating of preforms from water-ceramic suspensions. In this paper, a single-domain sample of metal/ceramic composite with lamellar microstructure is modelled theoretically using a combination of analytical and computational means. Stress field in the sample containing multiple transverse cracks in the ceramic layer is determined using a modified 2-D shear lag approach and a finite element method. Degradation of stiffness properties of the sample due to multiple transverse cracking is also predicted.
Original languageEnglish
Pages (from-to)3377-3384
Number of pages8
JournalProcedia Structural Integrity
Volume2
Early online date21 Jul 2016
DOIs
Publication statusPublished - 2016
Event21st European Conference on Fracture, ECF21 - Catania, Italy
Duration: 20 Jun 201624 Jun 2016

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cermets
ceramics
microstructure
ice
preforms
engineering
aerospace engineering
cost effectiveness
metal matrix composites
composite materials
infiltration
lamella
aluminum alloys
stress distribution
casts
stiffness
finite element method
time lag
cracks
degradation

Keywords

  • Metal-matrix composites
  • transverse cracking
  • stiffness degradation

Cite this

Transverse cracking in metal/ceramic composites with lamellar microstructure. / Kashtalyan, Maria; Piat, R; Guz, Igor.

In: Procedia Structural Integrity, Vol. 2, 2016, p. 3377-3384.

Research output: Contribution to journalArticle

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AB - Metal/ceramic composites with lamellar microstructures are a novel class of metal-matrix composites produced by infiltration of freeze-cast or ice-templated ceramic preforms with molten aluminium alloy. The cost-effectiveness of production and relatively high ceramic content make such composites attractive to a number of potential applications in the automotive, aerospace and biomedical engineering. A hierarchical lamellar microstructure exhibited by these composites, with randomly orientated domains in which all ceramic and metallic lamellae are parallel to each other, is the result of the ice crystal formation during freeze-casting or ice templating of preforms from water-ceramic suspensions. In this paper, a single-domain sample of metal/ceramic composite with lamellar microstructure is modelled theoretically using a combination of analytical and computational means. Stress field in the sample containing multiple transverse cracks in the ceramic layer is determined using a modified 2-D shear lag approach and a finite element method. Degradation of stiffness properties of the sample due to multiple transverse cracking is also predicted.

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