细观参数对纤维增强金属基复合材料宏细观力学性能的影响  

The Influence of Micro-parameters on Macro-Micromechanical Properties of Fiber Reinforced Metal Matrix Composites

作　　者：胡丽娟[1] 张少睿[1] 李大永[1] 苌群峰[1] 彭颖红[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2008年第3期475-479,共5页Journal of Shanghai Jiaotong University

基　　金：上海市科学技术委员会纳米专项基金项目(0452nm034;0552nm041)

摘　　要：B纤维、SiC纤维增强Al基及Mg基复合材料的微观参数对宏观性能具有重要影响.基于细观力学理论,利用代表性体积元(RVE)建立极坐标复合材料宏细观弹塑性本构模型,采用有限元法研究了Al基和Mg基复合材料的基体材料、纤维种类、纤维体积分数对复合材料整体力学性能的影响.研究结果表明:基体材料遵循自身弹塑性变化规律并引起复合材料整体的弹塑性变形,纤维保持其线弹性性能,在拉伸过程起主要承载作用;基体材料及纤维体积分数对复合材料力学性能的影响效应更强;利用宏细观本构模型计算获得的复合材料应力值与试验值接近,误差不超过2.5%.By utilizing the finite element method（FEM） of micromechanics combined with representative volume element（RVE） models,the elastic-plastic mechanics model was presented based on the combination of macroscopic and microscopic analysis in polar coordinates. The influence of micro-parameters of Al/Mg metal matrix composites （MMCs）, such as matrix materials, the types of fiber and fiber volume fraction, was investigated numerically. The results show that the matrix follows the rule of elastic-plastic behavior and leads to the elastic-plastic deformation of MMCs; the fiber playing the major role of load-supporting during MMCs stretched keeps its linear elastic properties. It is also found that the matrix materials and the fiber volume fraction have more effect on the mechanical behavior of material than the fiber types. Herein, new result demonstrates that there is little distinction of the value of maximum stress of MMCs between tests and the numerical analysis according to the model.

关 键 词：金属基复合材料 细观参数 宏细观弹塑性行为 数值仿真 

分 类 号：TB331[一般工业技术—材料科学与工程]