标题：Microstructural effect on crack propagation behavior of ceramic tool materials via cohesive zone modeling
作者：Li, Zuo Li ;Zhao, Jun ;Wang, Fu Zeng ;Li, An Hai ;Tian, Xian Hua
作者机构：[Li, Zuo Li ;Zhao, Jun ;Wang, Fu Zeng ;Li, An Hai ;Tian, Xian Hua ] Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School 更多
会议名称：12th International Conference on High Speed Machining, HSM 2015
会议日期：18 October 2015 through 20 October 2015
来源：Materials Science Forum
关键词：Ceramic tool materials; Cohesive element; Crack propagation; Microstructure model; Simulation
摘要：A systematic and parametric study of the effect of grain size and volume fraction of secondary phase on crack propagation behavior of Al2O3 based ceramic tool materials was carried out. Two-dimensional centroid Voronoi tessellations were generated with random grain orientations. Cohesive Zone Method (CZM) was utilized to simulate crack propagation behavior. Zero-thickness cohesive elements were embedded on grain boundaries and inside grains. Crack initiation and propagation in ceramic tool materials microstructure were simulated without predefined crack. Simulation results revealed that crack initiated at the maximum stress position and propagated along the direction perpendicular to external load. Decreasing the grain size or increasing the volume fraction of secondary phase can improve the fracture stress of Al2O3 ceramic tool materials. © 2016 Trans Tech Publications, Switzerland.