Publication detail
Design of damage tolerant and crack-free layered ceramics with textured microstructure
HOFER, A. WALTON, R. ŠEVEČEK, O. MESSING, G. BERMEJO, R.
Czech title
Design of damage tolerant and crack-free layered ceramics with textured microstructure
English title
Design of damage tolerant and crack-free layered ceramics with textured microstructure
Type
journal article in Web of Science
Language
en
Original abstract
This work demonstrates damage tolerant behavior of ceramic laminates designed with residual stresses and free of surface edge cracks. Non-periodic architectures were designed by embedding 2 textured alumina (TA) layers between 3 equiaxed alumina-zirconia (AZ) layers. Compressive residual stresses of ∼ 250 MPa were induced in the textured layers. Indentation strength tests showed that textured compressive layers arrested the propagation of cracks. Results were compared to periodic architectures with the same volume ratio of TA and AZ materials. Crack propagation was arrested in both periodic and non-periodic designs; the minimum threshold-strength being higher in the latter. Non-periodic architectures with compressive layers as thin as ∼ 200 μm showed no evidence of surface edge cracks, yet still reached minimum threshold strength values of ∼ 300 MPa. In addition, the textured microstructure promoted crack bifurcation in the thin compressive layers and thus enhanced the damage tolerance of the material.
Czech abstract
This work demonstrates damage tolerant behavior of ceramic laminates designed with residual stresses and free of surface edge cracks. Non-periodic architectures were designed by embedding 2 textured alumina (TA) layers between 3 equiaxed alumina-zirconia (AZ) layers. Compressive residual stresses of ∼ 250 MPa were induced in the textured layers. Indentation strength tests showed that textured compressive layers arrested the propagation of cracks. Results were compared to periodic architectures with the same volume ratio of TA and AZ materials. Crack propagation was arrested in both periodic and non-periodic designs; the minimum threshold-strength being higher in the latter. Non-periodic architectures with compressive layers as thin as ∼ 200 μm showed no evidence of surface edge cracks, yet still reached minimum threshold strength values of ∼ 300 MPa. In addition, the textured microstructure promoted crack bifurcation in the thin compressive layers and thus enhanced the damage tolerance of the material.
English abstract
This work demonstrates damage tolerant behavior of ceramic laminates designed with residual stresses and free of surface edge cracks. Non-periodic architectures were designed by embedding 2 textured alumina (TA) layers between 3 equiaxed alumina-zirconia (AZ) layers. Compressive residual stresses of ∼ 250 MPa were induced in the textured layers. Indentation strength tests showed that textured compressive layers arrested the propagation of cracks. Results were compared to periodic architectures with the same volume ratio of TA and AZ materials. Crack propagation was arrested in both periodic and non-periodic designs; the minimum threshold-strength being higher in the latter. Non-periodic architectures with compressive layers as thin as ∼ 200 μm showed no evidence of surface edge cracks, yet still reached minimum threshold strength values of ∼ 300 MPa. In addition, the textured microstructure promoted crack bifurcation in the thin compressive layers and thus enhanced the damage tolerance of the material.
Keywords in Czech
Layered ceramics; Edge crack; Non-periodic textured architecture; Residual stresses; Damage tolerance
Keywords in English
Layered ceramics; Edge crack; Non-periodic textured architecture; Residual stresses; Damage tolerance
Released
06.01.2020
Publisher
Elsevier
Location
Holandsko
ISSN
0955-2219
Volume
2020
Number
40
Pages from–to
427–435
Pages count
9
BIBTEX
@article{BUT161136,
author="Dino {Boccaccini} and Anna-Katherina {Hofer} and Rebecca {Walton} and Henrik Lund {Frandsen} and Oldřich {Ševeček} and Ivo {Dlouhý} and Gary L. {Messing} and Raul {Bermejo} and Sebastian {Molin} and Benoit {Charlas} and Johan {Hjelm} and Maria {Cannio} and Peter Vang {Hendriksen},
title="Design of damage tolerant and crack-free layered ceramics with textured microstructure",
year="2020",
volume="2020",
number="40",
month="January",
pages="427--435",
publisher="Elsevier",
address="Holandsko",
issn="0955-2219"
}