层状复合陶瓷增韧机理的数值模拟  

Numerical Approach to Toughening Design of Laminated Ceramic Composites

作　　者：常旭[1] 唐春安[1] 张后全[1] 张永彬[1] 张亚芳[2] 

机构地区：[1]大连大学材料破坏力学数值研究中心,大连116622 [2]东北大学材料破坏力学数值实验室,沈阳110004

出　　处：《无机材料学报》2005年第2期459-464,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(5017401350374020)

摘　　要：基于多层梁模型,在考虑材料非均匀性的基础上,采用有限元数值模拟的方法研究 了层状复合陶瓷的断裂行为.给出了复合陶瓷模型在三点弯曲的加载条件下,裂纹拐折和扩展 的过程,验证了层状复合陶瓷的主要增韧机理:裂纹沿软层界面拐折耗能.在此基础上,研究 了不同参数条件下,层状复合陶瓷韧性的变化规律.Based on the multilayer beam model, with a view to the heterogeneity of the material, this paper focused on the fracture behavior of the laminated ceramic composites by the finite-element method. In three-point bending condition, the crack propagation process that the crack penetrates the hard layers and expands along the interfaces of soft layers was presented. The primary mechanism that the soft layers decoy the crack expanding along the weak interfaces to absorb energy was affirmed. The toughness and strength changes as a function of the parameters such as thickness ratio, heterogeneity index m, etc. were analyzed by the FEM numerical simulation.

关 键 词：层状复合陶瓷 增韧 有限元 数值模拟 

分 类 号：TQ174[化学工程—陶瓷工业]