Micromechanical Modelling of Advanced Ceramics Using Statistically Representative Microstructures

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Title: Micromechanical Modelling of Advanced Ceramics Using Statistically Representative Microstructures
Authors: Alveen, Patricia
McNamara, Declan
Carolan, Declan
et al.
Permanent link: http://hdl.handle.net/10197/5903
Date: Sep-2013
Abstract: Advanced ceramics are a class of materials used as cutting tools in some of the most demanding material removal operations. Their high hardness makes them extremely suited for use at these extreme conditions. However they have a relatively low fracture toughness when compared to other conventional tool materials. A combined experimental-numerical method was used to investigate the role of microstructure on the fracture of advanced ceramics. In particular, the effect of grain size and matrix content were examined. Representative finite volume (FV) microstructures were created using Voronoi tessellation. It is shown, by comparing with real micrographs, that the method captures the features of real microstructures in terms of grain size distribution and grain aspect ratio. It was found that the underlying microstructure significantly affects the failure of this class of materials. Furthermore, it was found that by altering the microstructural parameters in the numerical model, such as grain size and matrix cont, it is possible to specify material improvements.
Type of material: Journal Article
Publisher: Trans Tech Publications
Copyright (published version): 2013 Trans Tech Publications
Keywords: Advanced ceramics;Microstructure;Voronoi tessellation;Finite volume analysis
DOI: 10.4028/www.scientific.net/KEM.577-578.53
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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