数值模拟SiCp/Al复合材料的微观结构对力学性能的影响  

Simulation of Microstructure-based Effects on Mechanical Properties of SiC_p/Al Composites

作　　者：王唱舟 周丽[1,2] 王洋[1] 丁昊[1] 

机构地区：[1]沈阳理工大学机械工程学院,辽宁沈阳110159 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《材料科学与工程学报》2015年第1期122-126,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51175353)

摘　　要：本文运用有限元法模拟了SiC颗粒体积分数和颗粒尺寸对SiCp/Al复合材料弹性模量、屈服强度、延伸率的影响。为了建立与真实显微结构相似的复合材料模型,假定任意尺寸的SiC颗粒随机地分布在SiCp/Al复合材料中。计算结果表明:SiC颗粒体积分数对复合材料的力学性能的影响更加显著。随着体积分数的增加,SiCp/Al复合材料的弹性模量和屈服强度逐渐增加;而其延伸率会相应降低。其应力应变曲线由韧性材料的特性向脆性材料的特性逐渐过渡。相反,当平均颗粒尺寸在一定的范围内变化时,颗粒尺寸对其应力-应变曲线的影响并不显著。By using the finite element method,the study numerically investigated the effects of volume fraction and particle size on the Young＇s modulus,yield strength and elongation of SiCp/Al composites were investigated.In oder to establish the micro-structure model similar as much as possible to the real composite microstructure,the ceramic particles in certain size were randomly distributed throughout the SiCp/Al composites.The calculation results show that the volume fraction considerably affected the mechanical properties of SiCp/Al composites.The elastic modulus and yield strength of the SiCp/Al composites increase accordingly with increasing volume fraction,while the elongation gradually decreases,and the characteristics of its stress-strain curve gradually goes from ductile style to fragile and brittlel.However,the average particle size has little influence,and almost no considerable influence acting on the stress-strain curve when the average particle size changes in a certain range.

关 键 词：SICP/AL复合材料 体积分数 颗粒尺寸 力学性能 有限元 

分 类 号：TB331[一般工业技术—材料科学与工程]