摘要
基于颗粒增强金属基复合材料的单球形颗粒模型和轴对称二维6节点三角形单元,利用ABAQUS对T6热处理后的两种体积分数的SiCP/6061Al合金复合材料的高温(300℃)单轴拉伸行为和单轴棘轮行为进行数值模拟。在有限元模拟中,对基体采用了新发展的、能够合理描述材料棘轮行为的黏塑性循环本构模型。数值模拟表明:本文中建立的有限元分析模型对颗粒增强金属基复合材料的高温单轴棘轮行为及其时间相关特性得到了较为合理的描述,模拟结果与实验吻合较好。模拟结果同时还揭示了复合材料内循环变形行为在细观层次上的不均匀性和复杂性。
The monotonic tensile and uniaxial ratcheting behaviors of T6- treated SiCp/6061Al alloy composites were numerically simulated at 300℃ by using ABAQUS and employing a single-particulate cell model of the composites and 2-D axi-symmetrical 6-node element. In the simulation, a new unified visco-plastic constitutive model, which simulated the ratcheting of the material reasonably, was proposed to describe the time-dependent cyclic deformation behavior of the matrix. It is shown from the simulations that the finite element model proposed in this work simulates the uniaxial ratcheting of the composites and its time-dependence, and the simulations agree with the corresponding experiments well. It is also shown that the cyclic deformation of the composites is heterogeneous and complicated in meso-scale.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2007年第4期82-87,共6页
Acta Materiae Compositae Sinica
基金
霍英东教育基金会优秀青年教师基金(91007)
四川省杰出青年基金(05ZQ026-028)
关键词
金属基复合材料
颗粒
棘轮行为
时间相关
高温
有限元
metal matrix composites
particulate
ratcheting
, time-dependence
high temperature
FEA
