Detail publikace
Design of alumina-zirconia composites with spatially tailored strength and toughness
CHANG, Y. BERMEJO, R. ŠEVEČEK, O. MESSING, G.
Český název
Design of alumina-zirconia composites with spatially tailored strength and toughness
Anglický název
Design of alumina-zirconia composites with spatially tailored strength and toughness
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
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.
Český abstrakt
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.
Anglický abstrakt
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.
Klíčová slova česky
Connectivity; Composites; Residual stresses; Fracture strength; Toughness
Klíčová slova anglicky
Connectivity; Composites; Residual stresses; Fracture strength; Toughness
Rok RIV
2015
Vydáno
05.01.2015
Nakladatel
Elsevier
Místo
Holandsko
ISSN
0955-2219
Ročník
2015
Číslo
35
Strany od–do
631–640
Počet stran
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",
year="2015",
volume="2015",
number="35",
month="January",
pages="631--640",
publisher="Elsevier",
address="Holandsko",
issn="0955-2219"
}