基于扩展多面体组合单元的非规则颗粒材料离散元方法

李典哲; 刘璐; 季顺迎

doi:10.21656/1000-0887.430152

基于扩展多面体组合单元的非规则颗粒材料离散元方法

doi: 10.21656/1000-0887.430152

大连理工大学工业装备结构分析国家重点实验室，辽宁大连 116024

基金项目:

国家重点研发计划(重点专项) 2021YFA1500302

国家重点研发计划(重点专项) 2018YFA0605902

国家自然科学基金项目 42176241

详细信息

作者简介:
李典哲(1999—)，女，硕士生(E-mail: lidianzhe@mail.dlut.edu.cn)

通讯作者:
季顺迎(1972—), 男, 博士, 教授(通讯作者. E-mail: jisy@dlut.edu.cn)

中图分类号: O347.7
计量
- 文章访问数: 485
- HTML全文浏览量: 169
- PDF下载量: 99
- 被引次数: 0
出版历程
- 收稿日期: 2022-05-01
- 修回日期: 2022-06-30
- 刊出日期: 2023-07-01

A Discrete Element Method for Irregular Granular Materials Based on Multi-Dilated Polyhedron Elements

State Key Laboratory of Structure Analysis of Industrial Equipment, Dalian University of Technology, Dalian, Liaoning 116024, P.R.China

摘要

摘要: 非规则颗粒材料广泛地存在于自然界和工业生产中，其复杂的几何形态对力学性质有显著的影响. 为构建更接近真实颗粒形态的理论模型，以扩展多面体为基本单元，发展了扩展多面体组合单元. 为验证扩展多面体组合单元的可靠性，分别对凸形三棱柱单元、凹形正倒锥体单元在平底漏斗中的卸料过程进行了离散元模拟，并与试验结果进行比较分析，得到其具有较好的一致性. 在此基础上，对不同形态的组合单元进行堆积和卸料离散元模拟，研究了颗粒形状对堆积分数、卸料流量和休止角的影响. 结果表明，颗粒形状越复杂，颗粒之间的互锁效应越显著，颗粒系统更加稳定. 扩展多面体组合单元的有效应用，为离散元数值模拟描述任意形态颗粒材料提供了一种新的构建方法.
- 离散单元法 /
- 扩展多面体颗粒 /
- 组合单元 /
- 非规则颗粒材料
Abstract: Irregular granular materials are widely available in nature and industrial fields. To construct a theoretical model closer to the real granular materials, a multi-dilated polyhedron model based on the dilated polyhedron element was developed. To verify the reliability of the multi-dilated polyhedron model, the discharge processes of the convex triangular prism particles and concave upward-downward conical particles in the flat bottom hopper were simulated and compared with experimental results, to show good consistency. Besides, the piling and discharge process of differently shaped multi-dilated polyhedron particles were simulated. Furthermore, the effects of particle shapes on the piling fractions, mass flow rates and angles of repose were discussed. The results indicate that, given a more complex particle shape, the interlocking between particles will be stronger, thereby the stability of the granular system will be higher. The effective application of multi-dilated polyhedron elements provides a new model-building method for irregular granular materials.
- discrete element method /
- multi-dilated polyhedron particle /
- combined element /
- irregular granular material

HTML全文

图 1 由不同扩展半径球体与多面体构造的扩展多面体单元

Figure 1. Dilated polyhedrons composed of various dilated spheres and polyhedrons

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图 2 不同形态的扩展多面体组合单元

Figure 2. Multi-dilated polyhedron elements with various shapes

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图 3 基于背景网格法的组合单元质量和惯性矩计算

Figure 3. Calculation of the mass and the moment of inertia for multi-dilated polyhedrons

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图 4 扩展多面体组合单元间的接触判断

Figure 4. The contact detection between multi-dilated polyhedrons

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图 5 凸形三棱柱单元和凹形正倒锥体单元

Figure 5. The convex triangular prism element and the concave upward-downward conical element

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图 6 平底漏斗几何形状(单位：m)

Figure 6. The geometry shape of the flat bottom hopper (unit: m)

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图 7 凸形三棱柱单元卸料过程的离散元模拟与试验对比

Figure 7. The convex triangular prism element's discharge process simulated with the DEM and compared with the physical experimental results

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图 8 凹形正倒锥体单元卸料过程的离散元模拟与试验对比

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 8. The concave upward-downward conical element's discharge process simulated with the DEM and compared with the physical experimental results

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图 9 卸料过程漏斗剩余颗粒比例随时间变化

Figure 9. The time histories of the residual particle fractions during hopper discharge

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图 10 不同形态的扩展多面体组合单元

Figure 10. Multi-dilated polyhedrons with various shapes

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图 11 扩展多面体组合单元形成的稳定颗粒床

Figure 11. Stable granular beds composed of multi-dilated polyhedrons

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图 12 颗粒形状对堆积分数的影响

Figure 12. Effects of particle shapes on the piling fraction

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图 13 不同时刻下组合单元的卸料过程

Figure 13. Discharging processes of multi-dilated polyhedrons at different moments

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图 14 卸料漏斗的几何尺寸

Figure 14. The geometry shape of the hopper model

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图 15 颗粒形状对流动和堆积特性的影响

Figure 15. Effects of particle shapes on the flow and packing characteristics

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表 1 两种扩展多面体组合单元的主要计算参数

Table 1. Major geometric and physical parameters of the triangular prism and the upward-downward conical elements

parameter	symbol	triangular prism element	upward-downward conical element
element mass	m/g	0.346 9	0.347 0
density	ρ/(kg/m³)	652	1 283
dilating radius	r/mm	0.1	0.1
friction coefficient	μ	0.3	0.3
Young’s modulus	E/GPa	1.0	1.0
Poisson’s ratio	ν	0.3	0.3

下载: 导出CSV

表 2 扩展多面体组合单元的主要几何和物理参数

Table 2. Major geometric and physical parameters of multi-dilated polyhedrons

parameter	value	parameter	value
density ρ/(kg/m³)	2 500	Poisson’s ratio ν	0.3
Young’s modulus E/GPa	10	friction coefficient μ	0.3
dilating radius r/m	0.02	restitution coefficient η	0.3

下载: 导出CSV

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