粉末冶金铍铝合金拉伸性能的有限元模拟  

Finite element simulation of tensile properties in powder metallurgy Be-Al alloy

作　　者：马玲[1] 赵双群[1] 

机构地区：[1]宁夏大学物理电气信息学院,宁夏银川750021

出　　处：《宁夏工程技术》2009年第1期49-51,共3页Ningxia Engineering Technology

基　　金：宁夏大学青年教师科研启动基金资助项目

摘　　要：采用ANSYS有限元软件分析在微观状态下粉末冶金铍铝合金的强度、内部应力场与颗粒形状、颗粒体积分数及基体强度的关系.该方法简单易行,并能够详尽地给出材料内部应力和应变场的分布细节,为材料的微观结构设计和力学性能改善提供理论支持.结果表明,颗粒的尖锐化会导致颗粒的尖端应力集中,致使低应力水平下材料在尖端处发生断裂.因此,在材料制备的过程中,应采用球形颗粒或对颗粒进行钝化处理;同时,由于颗粒和基体弹性模量的差异,使应力主要集中在颗粒上,而应变主要分布在基体上.通过模拟,比较不同颗粒体积分数和不同基体强度模型的屈服强度.结果表明,颗粒体积分数和基体强度的增加有助于提高铍铝合金的强度.With ANSYS software, the finite element method is used to analyze the relationship between strength and internal stress field of the powder metallurgy Be-Al alloy and the ship, fraction volume of the particles and property of the matrix. This method is simple and facility, which can show the internal stress and strain field of the material in detail and provides the support for micro-structure design of the material and improving mechanical property in theory. The result shows that the acumination of the particle can result in stress concentration of particle tip; it can lead to destroys on the particle tip in the lower stress lever. Meanwhile, the modulus difference of matrix and particle is the main reason of stress concentration in the particle and strain concentration in the matrix. The yield strength of the model which have different the fraction volume of the particle and the strength of the matrix are compared in the simulation, the result shows that the increase of the fraction volume of particle and the higher strength matrix are able to improving the strength of composite.

关 键 词：铍铝合金 颗粒增强复合材料 ANSYS有限元软件模拟 

分 类 号：TG146.2[一般工业技术—材料科学与工程]