Shijie Li, Chuanzhen Huang, Hanlian Liu, Zhenyu Shi, Lianggang Ji, Xinyao Cui, Chongzhen Du, Zhen Wang, Longhua Xu, Shuiquan Huang
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Fracture Toughness Modeling and Toughening Mechanisms Taking Into Account Grain Growth and Crack Deflections of Bionic Ceramic Cutting Tool Materials
A theoretical model of fracture toughness for bionic ceramic cutting tools was established by bionic design of the macro and micro toughening mechanisms of shells. This model can guide and optimize the fabrication process based on the required fracture toughness. Then, by prefabricating the macro-strong physical bonding interface, the effect laws of compositions and structural parameters on the theoretical model of fracture toughness and the toughening mechanism are obtained. The results show that the interface strengthening effect is gradually enhanced with the decrease of layer thickness ratio and the increase of the number of layers. The synergistic effects of multiple crack deflections, interfacial strengthening mechanisms (residual stress toughening and stepped fracture) and nanoparticle toughening improve the mechanical properties of bionic ceramic cutting tools. This theoretical model offers an advanced design concept and functional application for laminated materials.
期刊介绍：
Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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