机械工程学报 >

2018 , Vol. 54 >Issue 10: 85 - 92

DOI: https://doi.org/10.3901/JME.2018.10.085

材料科学与工程

离散元法金属粉末高速压制过程中力链特性量化研究

  • 张炜 ,
  • 周剑 ,
  • 于世伟 ,
  • 张雪洁 ,
  • 刘焜
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  • 合肥工业大学摩擦学研究所 合肥 230009
张炜,男,1991年出生,博士研究生。主要研究方向为颗粒物质力学与粉末压制成形。E-mail:zw1256@mail.hfut.edu.cn

收稿日期: 2017-06-10

  修回日期: 2017-12-23

  网络出版日期: 2018-05-20

基金资助

国家自然科学基金资助项目（11472096，51475135）。

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Quantitative Investigation on Force Chains of Metal Powder in High Velocity Compaction by Using Discrete Element Method

  • ZHANG Wei ,
  • ZHOU Jian ,
  • YU Shiwei ,
  • ZHANG Xuejie ,
  • LIU Kun
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  • Institute of Tribology, Hefei University of Technology, Hefei 230009

Received date: 2017-06-10

  Revised date: 2017-12-23

  Online published: 2018-05-20

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摘要

力链作为粉末颗粒体系中细观力学尺度结构，起到微观粉末运动与宏观力学性质变化联系纽带作用。采用离散元方法对金属粉末高速压制过程进行模拟，通过数目、长度、强度、准直系数这四种评估标准对力链特性进行量化研究，对比高速压制与一般压制状态下力链特性的差异，分析不同因素对高速压制中力链特性的影响。研究结果表明：高速压制过程与普通压制过程的力链初始状态具有差异，且高速压制过程中力链数目、长度、强度、准直系数均经历更为快速的变化过程。针对高速压制过程，颗粒间摩擦因数μ为0与非0条件下力链特性差异较大；不同初始密集程度下力链特性变化过程不同，但最后均较为接近；随着冲击速度的增加，力链特性变化幅度也逐渐增大。研究工作拓展了基于力链层面分析粉末高速压制过程中密度均匀化及致密化过程的理论基础。

关键词： 金属粉末; 高速压制; 力链; 量化; 离散元

本文引用格式

张炜 , 周剑 , 于世伟 , 张雪洁 , 刘焜 . 离散元法金属粉末高速压制过程中力链特性量化研究[J]. 机械工程学报, 2018 , 54(10) : 85 -92 . DOI: 10.3901/JME.2018.10.085

Abstract

As the meso-scale structure of powder granular system, force chains play a role as a link between micro movement of powder and macroscopic mechanical properties. The number, length, strength and collimation coefficient of force chains of metal powder in high velocity compaction (HVC) have been investigated quantitatively by using discrete element method (DEM). The difference of force chains between HVC and conventional compaction (CC) have been investigated. The different influential factors for force chains in HVC have also been analyzed. This investigation shows that the number, length, strength and collimation coefficient of force chains have changed more quickly in HVC than in CC. What's more, the initial conditions of force chains in HVC and CC are different. In HVC process, the characteristics of force chains for powder particles of μ=0 and μ≠0 are quite different. Although systems with different initial porosity have distinct characteristics of force chains during process, their final conditions are almost the same in the end. The variation in the characteristics of force chains is more drastic with the increasing of impact velocity. This investigation would expand the theoretical basis about phenomenon of densification and density homogenization of powder in HVC based on force chains.

Key words： metal powder; high velocity compaction; force chains; quantization; discrete element method (DEM)

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