摘要
利用复合材料细观有限元分析方法,对SiC颗粒增强6061Al合金复合材料的单拉行为、单轴棘轮行为进行数值模拟。模拟中讨论了耦合自由边界、界面结合状态对复合材料棘轮行为的影响;同时,分析了基体和界面的微观变形特征及其演变规律。选取1组合理的微结构参数,对复合材料的棘轮行为进行数值模拟,并通过与实验结果的比较,检验有限元模型的合理性。结果表明:耦合边界很大程度改善了模拟结果;界面结合状态越好,即界面弹性模量、屈服强度和硬化模量越高,产生的棘轮变形越小;具有合理参数值的弱界面模型给出的棘轮变形预测结果比完好界面模型的结果更接近于实验值。
Based on the mesoscopic unit cell of particulate reinforced composites, the monotonic tension and ratcheting behaviors of SiCp/6061AI composite were simulated by the finite element method. In the simulation, the effects of the coupled boundary condition and the interracial binding state on the ratcheting of the composite were discussed. Some microscopic deformation features in the matrix and the interface, and their evolution rules were analyzed. The ratcheting of SiCp/6061AI composite was simulated with a suitable choice of interracial bonding parameters, and the predicting capability of the finite element model was discussed by comparing the simulations with the experimental results. The results show that considering the coupled boundary condition improves the simulated results greatly; the better the interracial bonding is, i. e., the higher Young＇s modulus, yield strength and hardening modulus are, the smaller the ratcheting strain; the weak interface model with suitable interracial parameters provides more reasonable simulation to the ratcheting of the composite than the perfect interface model does.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第4期119-125,共7页
Acta Materiae Compositae Sinica
基金
教育部新世纪优秀人才支持计划项目(NCET05-0796)
四川省杰出青年基金(05ZQ026-028)
关键词
颗粒增强金属基复合材料
棘轮行为
界面
有限元分析
particle reinforced metal matrix composite
ratcheting
interface
finite element method
