Numerical analysis of multi-scale mechanical theory of microfine magnesite powder molding

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-09-13 DOI:10.1007/s10035-024-01466-8

Ruinan Zhang, Zhaoyang Liu, Songyang Pan, Lei Yuan, Tianpeng Wen, Jingkun Yu

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Abstract

This study presents a discrete element numerical model for the unidirectional compaction of microfine magnesite powder, designed to enhance the green body density based on laboratory apparatus configurations. The research demonstrated that as particle size decreased, porosity significantly reduced and density increased, resulting in a more uniform internal distribution within the green body. This led to closer particle contacts and an increased coordination number, which in turn intensified inter-particle interactions and the effectiveness of force transmission. During compaction, the distribution of force chains became more uniform, reducing localized stress concentrations and enhancing the mechanical integrity of the green body. The stress–strain relationship followed a polynomial pattern, highlighting the significant influence of particle size on the mechanical behavior during compaction. These findings provide a valuable theoretical basis for optimizing the compression molding process of microfine magnesite powder, facilitating the production of high-density, high-performance molded products.

Graphical abstract

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微细菱镁矿粉成型的多尺度力学理论数值分析

本研究介绍了微细菱镁矿粉单向压实的离散元数值模型，旨在根据实验室设备配置提高绿体密度。研究表明，随着颗粒尺寸的减小，孔隙率明显降低，密度增加，从而使坯体内部分布更加均匀。这导致颗粒接触更紧密，配位数增加，进而加强了颗粒间的相互作用和力传递的有效性。在压实过程中，力链的分布变得更加均匀，减少了局部应力集中，提高了绿体的机械完整性。应力-应变关系遵循多项式模式，凸显了颗粒大小对压实过程中力学行为的重要影响。这些发现为优化微细菱镁矿粉的压缩成型工艺提供了宝贵的理论依据，有助于生产高密度、高性能的成型产品。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS

CiteScore

4.30

自引率

8.30%

发文量

期刊介绍： Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.