摘要
在粉末压制过程中,材料的本构方程表征着粉体的变形机理,是用数值模拟方法研究、分析粉末压制过程的基础,因此,建立粉末压制本构方程对研究铝合金粉末压制成形规律、优化模具设计及工艺参数具有重要意义。通过对6061铝合金粉末进行单轴压缩、径向压缩（巴西圆盘实验）和模压实验,建立了相关材料参数随相对密度的变化规律,成功建立了Drucker-Prager Cap本构模型,并基于Abaqus仿真软件二次开发用户子程序USDFLD,添加了粉体材料密度场下6061铝合金粉末的模型参数,对铝合金粉末压制过程进行了数值模拟分析,通过压制力、位移曲线和相对密度分布结果验证了6061铝合金粉末冷压DPC本构模型的正确性。致密度在ρ=0.75-0.84范围内,仿真精度较高,即修正的DPC模型能更为准确地描述6061铝合金粉末的后期压制行为。
In the process of powder compacting,the constitutive equation of material characterizing the deformation mechanism of powder is the basis of researching and analyzing on powder compaction process by numerical simulation method,so the established powder compaction constitutive equation is of great significance to research the rules of powder compaction forming for aluminum alloy and optimize the mold design and process parameters. Through uniaxial compression,radial compression(Brazilian disc experiment） and die compaction experiment for aluminum alloy 6061 powder,the rules of relevant material parameters changing with relative density were obtained and the Drucker-Prager Cap constitutive model was successfully established. By adding model parameters of aluminum alloy 6061 powder in density field of powder material,the simulation analysis of compaction process for aluminum alloy 6061 powder was carried out by secondary development user subroutine USDFLD of Abaqus simulation software,and the correctness of cold compaction DPC constitutive model for aluminum alloy 6061 powder was verified by the results of pressing force,displacement curve and relative density distribution. When the density is in the range of ρ = 0. 75-0. 84,the simulation precision is high,that is,the modified DPC model can more accurately describe the late suppression behavior of aluminum alloy 6061 powder.
作者
王斌
黄尚宇
周梦成
雷雨
孙世民
Wang Bin;Huang Shangyu;Zhou Mengcheng;Lei Yu;Sun Shimin(School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, Chin)
出处
《锻压技术》
CAS
CSCD
北大核心
2018年第5期56-61,共6页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51475345)
关键词
6061铝合金粉末
压制成形
本构模型
模拟仿真
二次开发
aluminum alloy 6061 powder
compaction forming
constitutive model
numerical simulation
secondary development
