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Effect of residual stresses to the crack path in alumina/zirconia laminates
Affiliation:1. CEITEC IPM, Institute of Physics of Materials, Czech Academy of Sciences, Zizkova 22, 616 00 Brno, Czech Republic;2. CEITEC BUT, Brno University of Technology, Purkynova 123, 612 00 Brno, Czech Republic;3. Institute of Physics of Materials, Czech Academy of Sciences, Zizkova 22, 616 00 Brno, Czech Republic;4. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, 616 00 Brno, Czech Republic;1. Institute of Materials Research, Slovak Academy of Sciences, Ko?ice, Slovak Republic;2. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic;3. Institute of Physics of Materials, Czech Academy of Sciences, Brno, Czech Republic;4. Donát Bánki Faculty of Mechanical and Safety Engineering, Óbuda University, Budapest, Hungary;1. CIRIMAT, CNRS-INP-UPS, Université Toulouse 3 Paul-Sabatier, 118 route de Narbonne, F-31062, Toulouse Cedex 9, France;2. Plateforme Nationale CNRS de Frittage Flash, PNF², MHT, Université Toulouse 3 - Paul-Sabatier, 118 route de Narbonne, F-31062, Toulouse Cedex 9, France;3. CIRIMAT, CNRS-INP-UPS, INP-ENSIACET, 4 allée Emile Monso, BP 44362, F-31030, Toulouse Cedex 4, France;1. Department of Materials Science, Lehrstuhl fuer Struktur- und Funktionskeramik, Montanuniversitaet Leoben, Franz Josef Strasse 18, A-8700, Leoben, Austria;2. Department of Materials Science and Engineering, The Pennsylvania State University, 307 Steidle Bldg, University Park, PA, 16802, USA;3. Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno University of Technology, 616 69, Brno, Czech Republic
Abstract:Laminates with alternating layers are well known from nature. The strongly bonded alumina/zirconia (Al2O3/ZrO2) layers can combine high fracture resistance with high strength and stiffness when properly tailored. The presence of compressive residual stresses formed in Al2O3 layers can suppress and deflect cracks propagating through the layers. The crack path is governed by both the elastic properties and the internal stress field of individual layers. The laminates with various layer-thickness ratios ranging from 0.1 to 3 were used to investigate the effect of residual stresses and influence of crack formation pattern on the crack path development. The indentation surface cracks observed in various alumina-zirconia laminates exhibit the same crack deflection independently on the level of internal stresses. The crack deflection observed on the fracture surfaces of bending specimens was related to the indentations cracks. The complicated crack path was explained experimentally by 3D reconstruction with the support of numerical simulations.
Keywords:Laminates  Alumina  Zirconia  Residual/internal stresses  Crack path
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