Investigation of Failure Mechanism of Al2O3 Specimens Subjected to Three-Point Bending Test

Experimental loading and FEM simulation-based approach at macroscale are utilized to investigate the failure mechanisms of Al2O3 ceramics. Experimental characterization of microstructure is carried out using SEM. Recently the microscale models of representative volume of porous alumina ceramics were...

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Bibliographic Details
Published in:Frattura ed integritá strutturale 2019-07, Vol.13 (50)
Main Authors: Mikhail Olegovich Eremin, Igor Smolin, Alexey Kulkov, Valentina Mikushina
Format: Article
Language:English
Subjects:
Alumina ceramics
Crack propagation
Experiment
Fracture criterion
Numerical simulation
Three-point bending
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Summary:Experimental loading and FEM simulation-based approach at macroscale are utilized to investigate the failure mechanisms of Al2O3 ceramics. Experimental characterization of microstructure is carried out using SEM. Recently the microscale models of representative volume of porous alumina ceramics were built on the basis of grain and pore distribution patterns and subjected to uniaxial loading in order to determine effective mechanical characteristics which are utilized for macroscopic simulation in this work. Pre-fracture behavior of specimens undergoes the Drucker-Prager model with non-associated plastic flow rule. Experimental and numerical simulation fracture patterns show that material exhibits mixed mode I+II of crack propagation. Comparison of experimental data and numerical simulation data gives a good agreement.
ISSN:1971-8993