Publication detail

Design of alumina-zirconia composites with spatially tailored strength and toughness

CHANG, Y. BERMEJO, R. ŠEVEČEK, O. MESSING, G.

Original Title

Design of alumina-zirconia composites with spatially tailored strength and toughness

Type

journal article in Web of Science

Language

English

Original Abstract

Composites of Al2O3–5 vol.% t-ZrO2(ATZ) and Al2O3–30 vol.% m-ZrO2(AMZ) layers were designed with 3–1 connectivity to explore the effect of spatially-dependent residual stress and layer distribution on mechanical behavior. ATZ composites with "shallow" and "deep" regions of AMZ, defined relative to the distance from the surface, were fabricated. Four-point bending tests on indented 3–1 composites showed crack arrest in the first compressive AMZ layer and a fracture strength nearly independent of indent size (i.e. minimum strength); the failure occurring in the regionwith thicker outer ATZ layers ("deep" region). Region dependent crack growth resistance was measured on SEVNB specimens and compared to theoretical predictions using a fracture mechanics model. Spatially tailored constant strengths were obtained, ranging between 148 MPa and 470 MPa; the maximum value corresponding to a "shallow" region with a relatively thicker AMZ compressive layer embedded close to the tensile ATZ surface. The 3–1 design concept allows the fabrication of "deep" and "shallow" embedded regions within a unique composite architecture,thus providing a preferential path for crack propagation, opening new possibilities for design of composite structures with spatially-tailored crack growth resistance.

Keywords

Connectivity; Composites; Residual stresses; Fracture strength; Toughness

Authors

CHANG, Y.; BERMEJO, R.; ŠEVEČEK, O.; MESSING, G.

RIV year

2015

Released

5. 1. 2015

Publisher

Elsevier

Location

Holandsko

ISBN

0955-2219

Periodical

Journal of the European Ceramic Society

Year of study

2015

Number

35

State

United Kingdom of Great Britain and Northern Ireland

Pages from

631

Pages to

640

Pages count

10

BibTex

@article{BUT112563,
  author="Yunfei {Chang} and Raul {Bermejo} and Oldřich {Ševeček} and Gary L. {Messing}",
  title="Design of alumina-zirconia composites with spatially tailored strength and toughness",
  journal="Journal of the European Ceramic Society",
  year="2015",
  volume="2015",
  number="35",
  pages="631--640",
  doi="10.1016/j.jeurceramsoc.2014.09.017",
  issn="0955-2219"
}