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Reliability of alumina ceramics: Effect of grain siz

Seidel, Jürgen ; Claussen, Nils ; Rödel, Jürgen (1995)
Reliability of alumina ceramics: Effect of grain siz.
In: Journal of the European Ceramic Society, 15 (5)
doi: 10.1016/0955-2219(95)91430-V
Article, Bibliographie

Abstract

The grain size dependence of fracture strength and Weibull modulus of alumina using a high purity, commercial starting powder was investigated. In the regime of an average grain size between 1.7 and 11 μm, fracture strength increases with decreasing grain size. This behaviour could be explained quantitatively by modelling the failure-causing defect as either a spherical pore or a hemispherical surface pit with a circumferential crack proportional to the average grain size. No dependence of Weibull modulus on average grain size and hence on R-curve behaviour could be observed. Theoretical considerations show that the closure stresses in alumina responsible for the R-curve behaviour are too low to affect the Weibull modulus.

Item Type: Article
Erschienen: 1995
Creators: Seidel, Jürgen ; Claussen, Nils ; Rödel, Jürgen
Type of entry: Bibliographie
Title: Reliability of alumina ceramics: Effect of grain siz
Language: English
Date: 1995
Journal or Publication Title: Journal of the European Ceramic Society
Volume of the journal: 15
Issue Number: 5
DOI: 10.1016/0955-2219(95)91430-V
Abstract:

The grain size dependence of fracture strength and Weibull modulus of alumina using a high purity, commercial starting powder was investigated. In the regime of an average grain size between 1.7 and 11 μm, fracture strength increases with decreasing grain size. This behaviour could be explained quantitatively by modelling the failure-causing defect as either a spherical pore or a hemispherical surface pit with a circumferential crack proportional to the average grain size. No dependence of Weibull modulus on average grain size and hence on R-curve behaviour could be observed. Theoretical considerations show that the closure stresses in alumina responsible for the R-curve behaviour are too low to affect the Weibull modulus.

Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Department of Earth Sciences (1999 merged into Department of Materials and Earth Sciences)
Date Deposited: 19 Nov 2008 15:58
Last Modified: 20 Feb 2020 13:32
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