DEM model calibration and contact force network analysis of sand-EPS (rigid-soft) granular system subjected to one-dimensional compression

IF 2.3 3区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Ghazal Rezaie Soufi, Reza Jamshidi Chenari
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引用次数: 5

Abstract

Compressibility of Expanded Polystyrene (EPS) beads in mixtures of sand and EPS beads is considered by discrete element modeling of beads as clumps of particles bonded by a cohesive contact model. A calibration scheme is devised where input microparameters are calibrated stepwise, using experimental results and available data. The calibrated model is used to investigate the effect of parameters, namely normal pressure, EPS bead content and bead relative size on the compressibility and lateral stresses of the mixtures. Results showed an increase in mixture compressibility with the addition of EPS, which coincided with an increase in total coordination number. The increase in EPS bead size was observed to decrease compressibility. Microscale results showed a reduction in the overall, EPS-EPS and sand-EPS coordination numbers with the increase in bead relative size, resulting in the contact network being more dominated by sand-sand contacts which resulted in stiffer mixtures. However, this reduction in compressibility was negligible for larger EPS bead contents where coordination numbers showed that enough contacts are formed between EPS beads to create a continuous network across the sample, thus curtailing the effect of EPS bead size. Contact force networks showed that despite the increase in the number of sand-EPS and EPS-EPS contacts, the majority of forces are transferred through sand-sand contacts.

Abstract Image

一维压缩下砂- eps(刚软)颗粒体系的DEM模型标定及接触力网络分析
采用离散元模型,将膨胀聚苯乙烯(EPS)微珠作为颗粒团块通过粘性接触模型结合,考虑了其在砂和EPS混合物中的可压缩性。设计了一种校正方案,利用实验结果和现有数据逐步校正输入微参数。利用校正后的模型,研究了法向压力、EPS胶粒含量和胶粒相对尺寸等参数对混合料压缩性和侧向应力的影响。结果表明,EPS的加入增加了混合物的可压缩性,并与总配位数的增加相一致。观察到EPS颗粒大小的增加会降低压缩性。微观尺度上的结果表明,随着颗粒相对尺寸的增大,总体、EPS-EPS和砂- eps配位数都有所减少,导致接触网络更多地由砂-砂接触主导,从而形成更硬的混合物。然而,这种可压缩性的降低对于较大的EPS珠含量是可以忽略不计的,其中配位数表明,在EPS珠之间形成了足够的接触,从而在样品中形成连续的网络,从而削弱了EPS珠大小的影响。接触力网络表明,尽管砂- eps和EPS-EPS接触的数量有所增加,但大部分力是通过砂-砂接触传递的。
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来源期刊
Granular Matter
Granular Matter Materials Science-General Materials Science
CiteScore
4.60
自引率
8.30%
发文量
95
审稿时长
6 months
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.
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