Journal ArticleDOI
Evaluation by indentation of fracture toughness of ceramic materials
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In this paper, a new expression to determine the fracture toughness (KIC) by indentation is presented, which is independent of the crack profile (median or Palmqvist) and of the applied load.Abstract:
A transition fracture mode from Palmqvist to median has been observed in a number of ceramic materials A new expression to determine the fracture toughness (KIC) by indentation is presented The KIC values calculated by this formula are independent of the crack profile (median or Palmqvist) and of the applied load This formula has been obtained by modifying the universal curve of Evans and Charles to incorporate Palmqvist and median cracks over a wide range of loads in the case of brittle materials with different mechanical properties (elastic properties: E, v, KIC)read more
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Comparison of HVOF and plasma-sprayed alumina/titania coatings—microstructure, mechanical properties and abrasion behavior
TL;DR: In this paper, the microstructure, mechanical properties and abrasion wear resistance of alumina/titania ceramic coatings deposited with nano- and micro-structured powders by high-velocity oxygen fuel (HVOF) and plasma spray (PS) processes were evaluated.
Instituto de Pesquisas Energéticas e Nucleares
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Processing and mechanical properties of Al2O3–5 vol.% Cr nanocomposites
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Journal ArticleDOI
Comparison of flame sprayed Al2O3/TiO2 coatings: Their microstructure, mechanical properties and tribology behavior
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Patent
Ceramic or glass-ceramic article and methods for producing such article
Stephan Dierkes,Anne Jans Faber,Jan Wilkes,Mark P. M. Welters,Wilhelm Meiners,Konrad Wissenbach +5 more
TL;DR: In this article, a method of producing a (shaped) ceramic or glass-ceramic article, involving the steps of: (a) providing a powder or a powder mixture comprising of ceramic and glass materials, (b) depositing a layer of said powder or powder mixture on a surface, (c) heating at least one region of said layer by means of an energy beam or a plurality of energy beams to a maximum temperature such that at least a part of said porcelain or glass material in one region is melted, and (d) cooling the layer so that
References
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Journal ArticleDOI
A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I, Direct Crack Measurements
TL;DR: In this paper, the application of indentation techniques to the evaluation of fracture toughness is examined critically, in two parts: the first part is focused on an approach which involves direct measurement of Vickers-produced radial cracks as a function of the indentation load.
A Critical evaluation of indentation techniques for measuring fracture toughness
TL;DR: In this paper, the application of indentation techniques to the evaluation of fracture toughness is examined critically, in two parts: the first part is focused on an approach which involves direct measurement of Vickers-produced radial cracks as a function of the indentation load.
Journal ArticleDOI
Fracture Toughness Determinations by Indentation
Anthony G. Evans,E. A. Charles +1 more
Journal ArticleDOI
Elastic/Plastic Indentation Damage in Ceramics: The Median/Radial Crack System
TL;DR: In this article, a theory for describing the evolution of the median/radial crack system in the far field of sharp-indenter contacts is developed, based on a model in which the complex elastic/plastic field beneath the indenter is resolved into elastic and residual components.
Journal ArticleDOI
Indentation fracture: principles and applications
Brian R. Lawn,Rodney Wilshaw +1 more
TL;DR: The basic principles and practical applications of indentation fracture are reviewed in this article, with a focus on the application of fracture fracture in the field of orthogonal fracture repair and alignment.