Modeling of the Particle Abrasion Process and a Discrete Element Method Study of Its Shape Effect

Materials Pub Date : 2024-08-08 DOI:10.3390/ma17163947
Zhengbo Hu, Junhui Zhang, Xin Tan, Hao Yang
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Abstract

This study introduces a novel method for particle abrasion derived from fundamental natural phenomena and mechanical principles, allowing precise control over the degree of abrasion and more accurately mimicking natural processes. The method’s validity is confirmed using a specific shape index. Through conventional triaxial tests, the mechanical behavior of granular aggregates with varying degrees of abrasion was analyzed. The findings indicate that increased particle abrasion leads to a decrease in the average coordination number and sliding amount, while the rotation amount increases. This suggests an inverse relationship between the degree of abrasion and the structural stability and interlocking of the particle aggregate. The fabric anisotropy of the system is mainly attributed to the anisotropy of the contact normal force, which decreases as particle abrasion increases. The partial stress ratio of the particle system is influenced by fabric anisotropy and remains independent of particle shape. Additionally, the internal friction angle may be overestimated in conventional triaxial tests.
颗粒磨损过程建模及其形状效应的离散元素法研究
本研究介绍了一种源于基本自然现象和机械原理的颗粒磨损新方法,可精确控制磨损程度,更准确地模拟自然过程。该方法的有效性通过特定的形状指数得到了证实。通过传统的三轴试验,分析了不同磨损程度的颗粒集料的机械行为。研究结果表明,颗粒磨损程度的增加会导致平均配位数和滑动量的减少,而旋转量则会增加。这表明磨损程度与颗粒集料的结构稳定性和交错性之间存在反比关系。体系的织物各向异性主要归因于接触法向力的各向异性,这种各向异性随着颗粒磨损程度的增加而减小。颗粒系统的部分应力比受织物各向异性的影响,与颗粒形状无关。此外,在传统的三轴测试中,内摩擦角可能会被高估。
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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