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Coupled evaluation of R-curve behaviour and subcritical crack growth: Experimental method and data interpretation
Citation Link: https://doi.org/10.15480/882.16326
Publikationstyp
Journal Article
Date Issued
2025-11-29
Sprache
English
TORE-DOI
Volume
46
Issue
5
Article Number
118051
Citation
Journal of the European Ceramic Society 46 (5): 118051 (2026)
Publisher DOI
Scopus ID
Publisher
Elsevier
The fracture resistance is a design-relevant and material-specific feature. In ceramic materials, the fracture
resistance can increase as a function of the crack length. Such behaviour is beneficial, e.g. in terms of the
thermal shock resistance. It is termed R-curve behaviour and reflects the capacity of the material for intrinsic
and/or extrinsic toughening during stable crack advance. Another design-relevant material-specific property is
the sensitivity towards subcritical crack growth. The latter is a time-dependent phenomenon and commonly
estimated by two crack growth parameters. The presented paper aims for a detailed review of sequential fourpoint
bending experiments on V-notched beams, which are used to evaluate both phenomena from a single
measurement. Three groups of materials (Al2O3, Si3N4, and Lithosil glass) were tested and analysed by this
method in order to provide an experimental data background.
resistance can increase as a function of the crack length. Such behaviour is beneficial, e.g. in terms of the
thermal shock resistance. It is termed R-curve behaviour and reflects the capacity of the material for intrinsic
and/or extrinsic toughening during stable crack advance. Another design-relevant material-specific property is
the sensitivity towards subcritical crack growth. The latter is a time-dependent phenomenon and commonly
estimated by two crack growth parameters. The presented paper aims for a detailed review of sequential fourpoint
bending experiments on V-notched beams, which are used to evaluate both phenomena from a single
measurement. Three groups of materials (Al2O3, Si3N4, and Lithosil glass) were tested and analysed by this
method in order to provide an experimental data background.
Subjects
Alumina
Four-point bending
R-curve
Silicon nitride
Subcritical crack growth
DDC Class
620.11: Engineering Materials
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