金属基复合材料微屈服行为的力学分析与试验  

Mechanical and Experimental Analyses of Microyield Behavior of Metal Matrix Composites

作　　者：吴晶[1] 李文芳[2] 谢勇[2] 

机构地区：[1]广东交通职业技术学院机电控制系 [2]华南理工大学材料科学与工程学院

出　　处：《材料科学与工程学报》2011年第4期536-540,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(19972021)

摘　　要：本文采用细观力学计算、有限元分析和试验测试等方法,定量研究了短纤维增强金属基复合材料微屈服过程中应力应变分布和微屈服规律,结果表明不同短纤维分布朝向、体积比的Al2O3-SiO2(sf)/Al-Si复合材料微屈服行为符合Brown-Lukens关系,在增强体短纤维附近存在较大应力集中,晶粒直径、位错密度等材料参数对等效应力影响不大,对等效塑性应变有显著影响,同时分析了增强体短纤维的体积含量和短纤维分布状态对材料微屈服强度的影响。The microyield behavior and stress-strain distribution of short fibre reinforced metal matrix composites（MMCs） were analyzed quantitatively by micromechanics model,FEM model and experiments.The results show that the MMCs＇ microyield behavior likewise accords with Brown-Luken＇s relation approximately with different short fibre volume fractions and distributions.There is stress concentration in the matrix near the short fibre ends during the microyield process.The material parameters such as dislocation density and grain size have significant effect on the equivalent plastic strain but a little effect on the equivalent stress.The influence of short fibre volume fraction,fibre distribution on microyield behavior were analyzed too.

关 键 词：复合材料 微屈服 应力集中 

分 类 号：TB330.1[一般工业技术—材料科学与工程]