[1]石利彤,姚山.复合粉体混合过程的离散元建模仿真[J].中国材料进展,2025,44(09):854-861.[doi:10.7502/j.issn.1674-3962.202403002]
　SHI Litong,YAO Shan.Modeling and Simulation of Heterogeneous Powder Mixing Process Based on Discrete Element Method[J].MATERIALS CHINA,2025,44(09):854-861.[doi:10.7502/j.issn.1674-3962.202403002]
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复合粉体混合过程的离散元建模仿真()

中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
44
期数:
2025年09
页码:
854-861
栏目:
出版日期:
2025-09-29

文章信息/Info

Title:
Modeling and Simulation of Heterogeneous Powder Mixing Process Based on Discrete Element Method
文章编号:
1674-3962(2025)09-0854-08
作者:
石利彤; 姚山
大连理工大学材料科学与工程学院，辽宁 大连 116024
Author(s):
SHI Litong;  YAO Shan
School of Materials Science and Engineering, Dalian University of Technology, Dalian Liaoning, 116024
关键词:
复合粉体; 异质; 离散元; 混合方式; 混合均匀性
Keywords:
composite powder;  heterogeneity;  discrete element method;  mixing method;  mixing uniformity
分类号:
TB115；TQ051.7
DOI:
10.7502/j.issn.1674-3962.202403002
文献标志码:
A
摘要:
复合粉体的制备被很多领域的研究人员所重视，为了研究密度差异较大的异质粉体机械混合特性，采用离散元法对密度不同的硅砂、石墨、酚醛树脂粉体颗粒的机械混合进行研究。建立了两种混合机理不同的混合机模型、粉体颗粒模型以及Hertz-Mindlin with JKR接触模型，通过实验与仿真相结合的方式测量并标定颗粒间的接触参数，分析粉体颗粒在混合过程中的受力情况、运动轨迹、速率分布、颗粒碰撞数以及混合均匀性，并通过实验验证仿真模型的可靠性。研究发现，受自身重力，搅拌桨、其他颗粒和搅拌桶的碰撞及摩擦力的作用，粉体颗粒在混合机中的运动与实际相符，单螺旋锥形混合机更适合密度相差较大的硅砂、石墨与酚醛树脂粉体间的混合，在混合18 s后相对标准偏差可达到0122。通过两种混合机的混合实验和统计计算粉体的相对标准偏差验证了模型的可靠性，相对标准偏差小于013时的混合时间的绝对偏差≤2 s。
Abstract:
The preparation of composite powders has been highly valued by researchers in many fields. In order to study the mechanical mixing characteristics of heterogeneous powders with significant density differences, the discrete element method was used to study the mechanical mixing of silica sand, graphite and phenolic resin powder particles with different densities. Two kinds of mixer models with different mixing mechanisms, powder particle model and Hertz-Mindlin with JKR contact model were established. The contact parameters between particles were measured and calibrated by combining experiment and simulation. The force of powder particles in the mixing process, the motion trajectory, the rate distribution, the number of particle contacts and the mixing uniformity were analyzed, and the reliability of the simulation model was verified by experiments. Research has found that the movement of powder particles in the mixer is consistent with the reality under the force of its own gravity, collision and friction of stirring paddle, other particles and mixing barrel. The single spiral conical mixer is more suitable for mixing silica sand, graphite and phenolic resin powder with large density difference, and the relative standard deviation reaches 0.122 after 18 s. The reliability of the model is verified by the mixing experiments of two kinds of mixers and the relative standard deviation of powder calculated statistically. The absolute deviation of the mixing time is less than or equal to 2 s when the relative standard deviation is less than 0.13.

备注/Memo

备注/Memo:
收稿日期：2024-03-04修回日期：2024-04-01 第一作者：石利彤，女，1998年生，硕士研究生 通讯作者：姚山，男，1966年生，教授，博士生导师， Email: yaoshan@dlut.edu.cn
更新日期/Last Update: 2025-08-29