| 基于离散单元法的粉末高速压制流动过程模拟 |
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| 引用本文： | 郑洲顺,王 爽,郑 珊,曲选辉.基于离散单元法的粉末高速压制流动过程模拟[J].稀有金属材料与工程,2010,39(12):2132-2136. |
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| 作者姓名： | 郑洲顺 王 爽 郑 珊 曲选辉 |
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| 作者单位： | 1. 中南大学,湖南长沙,410083
2. 北京科技大学,北京,100083 |
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| 基金项目： | 国家自然科学基金(50874123)；国家重点基础研究发展规划(2006CB605207)；湖南省科技计划项目博士后专项(2007RS028)；中南大学博士后基金 |
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| 摘 要： | 将离散单元法应用于粉末高速压制流动过程研究，以模拟粉体流动的非连续特性。将粉末视为粘弹性的离散颗粒，推导了力与位移表达的粉末高速压制粘弹性本构关系，建立了粉末高速压制成形颗粒流动的离散单元法控制方程；并给出了该模型的动态松弛法求解过程。基于离散单元法求解器PFC软件，对粉末高速压制成形过程颗粒流动情况及密度分布进行了模拟，模拟结果与实验结果较吻合。分析了阻尼系数变化对求解过程的敛散性和压坯密度分布的影响
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| 关 键 词： | 高速压制成型 离散单元法 接触力 粘弹性模型 |
| 收稿时间： | 2009/12/21 0:00:00 |
Numerical Simulation of Particle Flow for High Velocity Compaction Based on Discrete Element Method |
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| Zheng Zhoushun,Wang Shuang,Zheng Shan and Qu Xuanhui.Numerical Simulation of Particle Flow for High Velocity Compaction Based on Discrete Element Method[J].Rare Metal Materials and Engineering,2010,39(12):2132-2136. |
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| Authors: | Zheng Zhoushun Wang Shuang Zheng Shan and Qu Xuanhui |
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| Affiliation: | Central South University, Changsha 410083, China;Central South University, Changsha 410083, China;Central South University, Changsha 410083, China;University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Discrete element method is applied to simulate the loose particle flowing in the process of high velocity compaction. Assuming that the powder is formed by viscoelastic metal particles, a constitutive model of viscoelastic powder in high velocity compaction described by force-displacement is deduced. The governing equation of particle flow for high velocity compaction is established. The calculation method of the contact force is improved. Based on computing software PFC for the discrete element method, the particle flow and density distribution during high velocity compaction is simulated. The simulation results are consistent with the experimental. The influence of damping coefficient variation on the convergence and divergence of solving process and the density distribution of green compact is analyzed |
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| Keywords: | high velocity compaction discrete element method contact force viscoelastic model |
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