Ovid'ko I A
Research 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
Philos Trans A Math Phys Eng Sci. 2015 Mar 28;373(2038). doi: 10.1098/rsta.2014.0129.
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.
本文综述了纳米陶瓷断裂过程的关键实验数据和理论表述。重点关注纳米陶瓷中的裂纹扩展及其增韧微观力学。讨论了传统的增韧微观机制，这些机制在含有纳米夹杂物的微晶基体陶瓷和纳米晶基体陶瓷中均能有效发挥作用。特别关注与纳米晶基体陶瓷裂纹尖端附近发生的纳米级变形相关的特殊（新）增韧微观机制的描述。此外，还考虑了通过制备陶瓷-石墨烯纳米复合材料显著提高陶瓷材料断裂韧性的新策略。讨论了在含有石墨烯片和/或少层片的此类纳米复合材料中起作用的增韧微观机制。
