LEGUILLON, Dominique; MARTIN, Eric; SEVECEK, Oldrich; BERMEJO, Raul

doi:10.1016/j.euromechsol.2015.06.008

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LEGUILLON, Dominique
Institut Jean Le Rond d'Alembert [DALEMBERT]

MARTIN, Eric
Laboratoire des Composites Thermostructuraux [LCTS]

SEVECEK, Oldrich
Brno University of Technology [Brno] [BUT]

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European Journal of Mechanics A/ Solids. 2015, vol. 54, p. 94-104

Résumé en anglais

One novel approach to improve the apparent toughness of ceramics is to design a multilayer architecturewith embedded layers having compressive residual stresses. Surface cracks propagating during me-chanical loading can be deflected within the compressive layers, in order to delay thefinal fracture of thewhole structure. The design of high toughness laminates requires understanding the effect of residualstresses on the initiation and propagation of cracks in the material.In this work, a coupled stress-energy criterion is used to predict the initiation and propagation ofsurface cracks in ceramic laminates upon thermo-mechanical loading. Experiments were conducted onV-notched alumina-based laminates to show the effect of residual stresses and mechanical loading ontheir fracture behaviour. The conditions for crack initiation as predicted for notched specimens agreedwith the experimental observations. It is shown that the onset of cracks from V-notches is associatedwith (i) the tensile residual stresses in thefirst surface layer and (ii) the depth of the notch. The furtherpropagation of the crack into thefirst embedded compressive layer was also studied. Based upon thecoupled criterion, a short penetration of the propagating crack into thefirst compressive is foreseen. Ifthe mechanical load is increased, the crackfinally deflects within the compressive layer propagating witha certain angle which is also predicted with a good accuracy< Réduire

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Layered ceramics

Residual stresses

Crack initiation

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Application of the coupled stress-energy criterion to predict the fracture behavior of layered ceramics designed with internal compressive stresses

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