Application of optical methods to investigate the non-linear asymmetric behavior of ceramics exhibiting large strain to rupture by four-points bending test

Large strain to rupture behavior is essential, for refractory materials, to improve their thermal shock resistance. The non-linear comportment under loading of specific developed ceramics associated to their type of microstructure (micro-cracked) leads to the possibility to increase their strain-to-...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2012-12, Vol.32 (16), p.4073-4081
Main Authors: Belrhiti, Y., Gallet-Doncieux, A., Germaneau, A., Doumalin, P., Dupre, J.C., Alzina, A., Michaud, P., Pop, I.O., Huger, M., Chotard, T.
Format: Article
Language:English
Subjects:
Al2TiO5
Aluminum titanates
Asymmetry
Ceramics
Digital
Digital image correlation
Engineering Sciences
Materials
Mechanical properties
Mechanics
Mechanics of materials
Nonlinearity
Refractories
Rupture
Strain
Strength
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Summary:Large strain to rupture behavior is essential, for refractory materials, to improve their thermal shock resistance. The non-linear comportment under loading of specific developed ceramics associated to their type of microstructure (micro-cracked) leads to the possibility to increase their strain-to-rupture level. Aluminum titanate (AT: Al2TiO5) ceramics are one of these materials and are characterized by a mechanical behavior strongly dependent on their microstructure. Indeed, this behavior can vary from a fragile one to a large non-linear one according to the degree of microcracking present within the material. The paper here presented is devoted to the study of this nonlinear behavior thanks to four-points bending test associated with digital image correlation technique to determine kinematics fields. Results highlight the asymmetric character of the mechanical behavior of a microcracked aluminum titanate. A comparison between the Young moduli and fracture strength obtained using conventional and ones identified by digital image correlation will be done.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2012.06.016