摘要
在细观有限元模型基础上,利用ABAQUS有限元程序对具有不同颗粒形状(球形、立方体、短棱柱和短圆柱)的SiCP/6061Al合金复合材料的单调拉伸行为和单轴棘轮行为进行数值模拟,讨论颗粒形状对复合材料棘轮行为的影响。结果表明:颗粒形状对复合材料的弹性模量、单拉行为和单轴棘轮行为均有较大影响。在所讨论的几种颗粒形状中,球形颗粒的增强效果最弱,抵抗棘轮变形的能力最差;不同短棱柱颗粒的增强效果与其拥有的棱边数有关,即五棱柱颗粒的增强效果最好,然后随棱边数的增加逐渐下降,最后接近于短圆柱形颗粒。通过有限元分析结果讨论了不同颗粒形状下基体的细观塑性变形特征及其演化规律,这些结果有助于分析该类复合材料损伤和失效机制。
Based on the single particle representative volume element of particle reinforced composites, the monotonic tensile stress-strain curve and uniaxial ratcheting behavior of SiCp/6061Al alloy composites were numerically simulated by using finite element code ABAQUS and considering different particulate shapes, and the effect of particle shape on the ratcheting of the composite was discussed. The shapes of the particles are sphere, cube, short prisms and short cylinder. The results show that for the particles with prescribed shapes, the reinforcing degree of the spherical particle to the matrix is the weakest, and its composite produces the largest ratcheting strain in the cyclic stressing. For the short prismatic particle, its reinforcing degree depends on the number of its edges, i. e. , the reinforcing degree of the pentagonal prism particle is the highest, and then the reinforcing degree of the short prismatic particle decreases with the increase of the edge number, and finally becomes close to that of the short cylindrical particle. Moreover, based on the numerical results, the mesoscopic plastic deformation and its evolution features of the composites were also discussed, which is very useful in studying the damage and failure mechanism of particle reinforced metal matrix composites.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2008年第1期153-160,共8页
Acta Materiae Compositae Sinica
基金
霍英东教育基金会优秀青年教师基金(91007)
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
金属基复合材料
颗粒形状
棘轮行为
塑性变形
有限元方法
metal matrix composites
particle shape
ratcheting
plastic deformation
finite element method
