离散元法金属粉末高速压制过程中力链特性量化研究

doi:10.3901/JME.2018.10.085

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 85-92.doi: 10.3901/JME.2018.10.085

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

合肥工业大学摩擦学研究所合肥 230009

收稿日期:2017-06-10 修回日期:2017-12-23 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 刘焜(通信作者),男,1963年出生,博士,教授,博士研究生导师。主要研究方向为表面摩擦学、界面流体力学与颗粒物质力学。E-mail:liukun@hfut.edu.cn
作者简介: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
基金资助:
国家自然科学基金资助项目（11472096，51475135）。

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

Institute of Tribology, Hefei University of Technology, Hefei 230009

Received:2017-06-10 Revised:2017-12-23 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

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: 高速压制, 金属粉末, 离散元, 力链, 量化

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: discrete element method (DEM), force chains, high velocity compaction, metal powder, quantization

中图分类号:

O320

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.

ZHANG Wei, ZHOU Jian, YU Shiwei, ZHANG Xuejie, LIU Kun. Quantitative Investigation on Force Chains of Metal Powder in High Velocity Compaction by Using Discrete Element Method[J]. Journal of Mechanical Engineering, 2018, 54(10): 85-92.

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离散元法金属粉末高速压制过程中力链特性量化研究

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

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