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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
Published on: November 22, 2021
Micromechanics of fracturing in nanoceramics
1Research Laboratory for Mechanics of New Nanomaterials, St Petersburg State Polytechnical University, St Petersburg 195251, Russia Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Bolshoj 61, Vasil. Ostrov, St Petersburg 199178, Russia Department of Mathematics and Mechanics, St Petersburg State University, Universitetskii pr. 28, Staryi Petergof, St Petersburg 198504, Russia ovidko@nano.ipme.ru.
Abstract:
An overview of key experimental data and theoretical representations on fracture processes in nanoceramics is presented. The focuses are placed on crack growth in nanoceramics and their toughening micromechanics. Conventional toughening micromechanisms are discussed which effectively operate in both microcrystalline-matrix ceramics containing nanoinclusions and nanocrystalline-matrix ceramics. Particular attention is devoted to description of special (new) toughening micromechanisms related to nanoscale deformation occurring near crack tips in nanocrystalline-matrix ceramics. In addition, a new strategy for pronounced improvement of fracture toughness of ceramic materials through fabrication of ceramic-graphene nanocomposites is considered. Toughening micromechanisms are discussed which operate in such nanocomposites containing graphene platelets and/or few-layer sheets.
