摘要
采用Eshelby等效夹杂理论,分析SiCp/Al复合材料受载时作用在SiC颗粒上的应力。假设SiC颗粒失效符合Weibull统计分布,在综合考虑复合材料各种强化机制的基础上,引入颗粒失效对材料屈服强度的影响,建立SiCp/Al复合材料的屈服强度模型。结果表明,该模型预测的屈服强度与相应的实验结果吻合较好。同时模型显示在屈服状态下,颗粒直径较小时,复合材料的颗粒失效以界面脱粘为主,而随着粒度的增大,颗粒的断裂分数迅速增大,颗粒失效则转变为由颗粒断裂和界面脱粘共同控制。
The SiC particles stress in Aluminum matrix composites was examined according to the Eshelby＇s equivalent inclusion approach. A model was established to examine the influence of SiC particles failure on the yield strength of SiCp/Al composites after as- sumption that the SiC particles failure follows Weibull statistics. The values of tensile strength of SiCp/A1 composites predicted by the model are well agreed with the experimental values. Moreover, the interface debond is the main failure way when the particle diameter is small in yielding condition, the percentage of particle fracture was found to increases with the increase of particles volume fraction and play the more important role in particle failure.
出处
《机械强度》
CAS
CSCD
北大核心
2008年第6期953-958,共6页
Journal of Mechanical Strength
基金
国家重点基础研究发展规划(2005CB623704)
中国博士后基金(20070410986)资助项目~~
关键词
铝基复合材料
颗粒失效
屈服强度模型
Aluminum matrix composite
Particle fracture
Yield strength model
