摘要
在Voronoi网格表征的微观组织中插入含有断裂准则的内聚力单元,建立了具有不同晶粒数的单相Al2O3陶瓷刀具材料的微观组织断裂模型,并模拟了其受载后的微观断裂行为。发现裂纹从微观尺度扩展到宏观尺度过程中,出现了晶粒桥联现象,且材料的临界断裂能释放率逐渐增加。根据模拟结果预测了单相Al2O3陶瓷刀具材料的宏观断裂韧度。裂纹扩展路径的模拟结果与实验中获得的微观组织照片有较好的一致性,反映了本模拟的正确性。
In this paper, a micromechanical model for single-phase Al2O3 ceramic tool materials with different number of grains is established by embedding cohesive elements with fracture criteria in the microstructure model represented with Voronoi tessellation and the fracture simulation is conducted under the applied load.As the crack path grows from microscale to macroscale, the grain-bridging phenomenon appears and the critical fracture energy release rate gradually rises.The fracture toughness of single-phase Al2O3 ceramic tool materials in macro-scale is predicted based on simulation results.The simulation results of the fracture paths are in good accordance with the SEM photo, which can verify the simulation results.
作者
周婷婷
衣明东
杜劲
ZHOU Ting-ting YI Ming-dong DU Jin(School of Mechanical and Automotive Engineering, Qilu University of Technology, Jinan 250353, Chin)
出处
《齐鲁工业大学学报》
2017年第4期50-54,共5页
Journal of Qilu University of Technology
基金
国家自然科学基金(51405253
51405254)
山东省自然科学基金(ZR2016EEP15)
