Granular Matter最新文献

Elasto-frictional reduced model of a cyclically sheared container filled with particles 充满颗粒的循环剪切容器的弹摩简化模型

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-10-09 DOI: 10.1007/s10035-025-01583-y

Antoine Faulconnier, Stéphane Job, Julien Brocail, Nicolas Peyret, Jean-Luc Dion

{"title":"Elasto-frictional reduced model of a cyclically sheared container filled with particles","authors":"Antoine Faulconnier, Stéphane Job, Julien Brocail, Nicolas Peyret, Jean-Luc Dion","doi":"10.1007/s10035-025-01583-y","DOIUrl":"10.1007/s10035-025-01583-y","url":null,"abstract":"<div><p>This article explores the hysteretic behavior and the damping features of sheared granular media using discrete element method (DEM) simulations. We consider polydisperse non-cohesive frictional spherical particles, enclosed in a container with rigid but moving walls, subjected to a cyclic simple shear superimposed on a confining pressure. The mechanical response of the grains is analyzed in the permanent regime, by fitting the macroscopic stress–strain relation applied to the box with a Dahl-like elasto-frictional model. The influence of several parameters such as the amplitude of the strain, the confining pressure, the elasticity, the friction coefficient, the size and the number of particles are explored. We find that the fitted parameters of our macroscopic Ansatz rely qualitatively on both a well-established effective medium theory of confined granular media and a well-documented rheology of granular flow. Quantitatively, we demonstrate that the single degree-of-freedom elasto-frictional reduced model reliably describes the nonlinear response of the granular layer over a wide range of operating conditions. In particular, we show that the mechanical response of a granular slab under simple shear depends on a unique dimensionless parameter akin to an effective Coulomb threshold at low shear/high pressure. Furthermore, exploring higher shear/lower pressure, we evidence optimal damping at the crossover between a loose unjammed regime and a dense elastic regime.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Optimizing vibrations mitigation by confined elasto-frictional particles with a DEM-based Dahl-like reduced model</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental evidence of detailed balance in granular systems 颗粒系统中详细平衡的实验证据

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-10-06 DOI: 10.1007/s10035-025-01579-8

Xulai Sun, Yinqiao Wang, Yujie Wang, Raphael Blumenfeld, Jie Zhang

{"title":"Experimental evidence of detailed balance in granular systems","authors":"Xulai Sun, Yinqiao Wang, Yujie Wang, Raphael Blumenfeld, Jie Zhang","doi":"10.1007/s10035-025-01579-8","DOIUrl":"10.1007/s10035-025-01579-8","url":null,"abstract":"<div>\u0000 \u0000 <p>The principle of detailed balance (DB) states that every kinetic transition in a system with many micro-states, <span>(mu )</span>, is balanced, on average, with the opposite transition, <span>(mu _ileftrightharpoons mu _j)</span>. The current perception is that, on the scale of the most elementary degrees of freedom, DB is satisfied only in equilibrium systems, although a rigorous proof exists only for thermal systems. It is believed that, on this scale, non-equilibrium steady states can only be balanced by cycles, such as <span>(Arightarrow Brightarrow Crightarrow A)</span>. We report here experiments on a family of out-of-equilibrium quasi-statically cyclically sheared granular systems, which appear to show robust DB. We then analyse in detail the concept and interpretation of DB and show that our systems are the exact equivalent of chemically reactive systems in thermal equilibrium. We therefore conclude that our non-equilibrium systems do indeed satisfy this principle. We further study the approach to DB as a function of system size and time. Given the significant progress to which this principle has led in equilibrium systems, these observations may pave the way for better models of the dynamics and statistical mechanics of these and potentially other non-equilibrium systems.</p>\u0000 </div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01579-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal discrete particle model of powder melting and coalescence in additive manufacturing 增材制造中粉末熔化与聚并的热离散粒子模型

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-10-06 DOI: 10.1007/s10035-025-01581-0

Mohamad Yousef Shaheen, Stefan Luding, Anthony R. Thornton, Thomas Weinhart

{"title":"Thermal discrete particle model of powder melting and coalescence in additive manufacturing","authors":"Mohamad Yousef Shaheen, Stefan Luding, Anthony R. Thornton, Thomas Weinhart","doi":"10.1007/s10035-025-01581-0","DOIUrl":"10.1007/s10035-025-01581-0","url":null,"abstract":"<div><p>Laser powder bed fusion (LPBF) is an additive manufacturing technique that utilizes laser-induced melting of specific regions within a powder layer to create complex parts. Achieving high-quality products in LPBF requires the optimization of process parameters based on the unique characteristics of the powder material. Since experimental optimisation can be both time-consuming and costly, we propose a computational model capable of simulating the particle micro-mechanics in LPBF, offering a more cost-effective solution.</p><p>We have developed a novel thermal discrete particle and contact model that accurately captures the essential phenomena of melting, coalescence, and consolidation within LPBF. Our model assumes that solid particles partially melt under the influence of heat, subsequently coalesce, and form solid bonds during the cooling phase. The rate of coalescence is determined by the material’s surface tension and viscosity as it undergoes melting. To account for phase transitions, we employ an apparent heat capacity method. We first introduce our contact model and provide verification against analytical solutions for a two-particle system. We then demonstrate the efficacy of our model by applying it to a multi-particle example, successfully capturing the coalescence and consolidation behaviour observed in LPBF. The model has been implemented in the open-source code MercuryDPM. The current model is developed for polymer material, but it can be extended to metal and ceramic.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Thermal Discrete Particle Model of Particle melting and Coalescence</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01581-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145256096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of porosity model construction for high pellet ratio mixed-burden layers in blast furnace 高炉高球团比混料层孔隙率模型构建研究

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-29 DOI: 10.1007/s10035-025-01577-w

Yating Cui, Ruishuai Si, Zhenyang Wang, Jianliang Zhang, kexin Jiao, Peiyuan Lu

{"title":"Investigation of porosity model construction for high pellet ratio mixed-burden layers in blast furnace","authors":"Yating Cui, Ruishuai Si, Zhenyang Wang, Jianliang Zhang, kexin Jiao, Peiyuan Lu","doi":"10.1007/s10035-025-01577-w","DOIUrl":"10.1007/s10035-025-01577-w","url":null,"abstract":"<div><p>Driven by the “dual carbon” strategy for low-carbon steel transformation, raising the pellet ratio in the blast furnace (BF) burden offers a core technical path to optimize burden structure and cut carbon emissions. The distribution of BF burden critically influences operation by affecting internal gas flow, heat and mass transfer, and chemical reactions. This study employs the discrete element method (DEM) to examine how burden structure affects bed porosity at high pellet ratios, emphasizing mixed-layer formation. Key findings include: (1) Porosity evolution patterns in mixed burden layers under varying furnace charge configurations were characterized. (2) Porosity is minimized at the ore-coke interface because of particle penetration. Additionally, this effect intensifies as the coke-ore size difference increases. (3) Increasing the pellet ratio enhances lump-zone bed porosity and permeability. As the pellet ratio increased from 30 to 90%, bed porosity rose from 33.75 to 36.19%, a 2.43% increase.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shear strength measurement of a calcite bond between bio-cemented sand grains 生物胶结砂粒间方解石粘结的抗剪强度测定

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-29 DOI: 10.1007/s10035-025-01567-y

Marilyn Sarkis, Antoine Naillon, Fabrice Emeriault, Christian Geindreau

{"title":"Shear strength measurement of a calcite bond between bio-cemented sand grains","authors":"Marilyn Sarkis, Antoine Naillon, Fabrice Emeriault, Christian Geindreau","doi":"10.1007/s10035-025-01567-y","DOIUrl":"10.1007/s10035-025-01567-y","url":null,"abstract":"<div><p>In this study, a contact-scale approach is developed in order to measure the strength of the bio-cemented bond under shear loading. Fifteen pairs of bio-cemented sand grains, coming from two different bulk samples with different calcite content, were first observed using high-resolution synchrotron X-ray tomography in order to compute the contact surface area, before being subjected to the shear loading. After failure, these samples were also observed using scanning electron microscopy and energy-dispersive X-ray spectroscopy in order to determine the failure mode. The results have shown that the shear strength is 2.11 times higher that the tensile strength for this material, and has an average value of 5.81 ± 1.99 MPa. Digital image correlation was used in this study in order to distinguish the samples that broke due to shear from those that broke due to rolling. Similarly to the case under tensile loading, failure was also observed to occur at the interface between the sand and the calcite crystals. The percentage of active calcite crystals <span>(hbox {f}_textrm{c})</span> was also found to be around 25%, independently of the amount of calcite present in the initial bulk sample.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Main steps followed in the study that allow to find the shear strength of a bond between bio-cemented sand grains.</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145210381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correction: Statistics for simulated assemblies of particles from mathematical models 更正：来自数学模型的模拟粒子集合的统计数据

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-15 DOI: 10.1007/s10035-025-01573-0

Felix Ballani, Dietrich Stoyan

引用次数: 0

Stress probing analysis of recent stress history effects on small-to-medium strain stiffness of granular materials 近期应力历史对颗粒材料中小应变刚度影响的应力探测分析

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-11 DOI: 10.1007/s10035-025-01575-y

T. H. Chen, Z. X. Yang

{"title":"Stress probing analysis of recent stress history effects on small-to-medium strain stiffness of granular materials","authors":"T. H. Chen, Z. X. Yang","doi":"10.1007/s10035-025-01575-y","DOIUrl":"10.1007/s10035-025-01575-y","url":null,"abstract":"<div><p>This paper investigates the effects of recent stress history (RSH), specifically sudden changes in the stress path direction, on the small-strain stiffness and stiffness degradation characteristics of granular materials, using three-dimensional discrete element method (DEM) simulations. Specimens with varying RSHs are prepared via a series of approach paths from diverse directions, involving deviations from and returns to a common stress state. The norm of the induced plastic strain, obtained through a stress probing technique, is proposed as a criterion to determine the extent of the approach path. Subsequently, constant-<i>p</i> triaxial compression tests are conducted to analyze the effects of different RSHs on stress–strain response, small-strain stiffness, and stiffness degradation. Results reveal that specimens experiencing full stress reversal exhibit significantly higher small-strain shear stiffness than those under sustained load directions. Specimens loaded with counterclockwise stress rotation angles exhibited slightly greater stiffness than those with equivalent clockwise angles. Furthermore, the configuration of stiffness degradation curves, defined by onset and reference shear strain, is strongly influenced by the stress rotation angle. Stress probing reveals that RSH mainly affects total shear stiffness degradation by altering the extent of plasticity, with the elastic stiffness remaining largely unaffected. Finally, a modification to an existing stiffness model is proposed by introducing an RSH-dependent factor, complementing the effects of void ratio, stress state, and shear strain, to enhance predictive accuracy.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DEM investigation on compaction characteristics and maximum dry density behavior of over coarse-grained soil 超粗粒土压实特性及最大干密度特性的DEM研究

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-11 DOI: 10.1007/s10035-025-01574-z

Mincai Jia, Yiming Zheng, Yibing Deng, Jin Huang, Gang Zhang

{"title":"DEM investigation on compaction characteristics and maximum dry density behavior of over coarse-grained soil","authors":"Mincai Jia, Yiming Zheng, Yibing Deng, Jin Huang, Gang Zhang","doi":"10.1007/s10035-025-01574-z","DOIUrl":"10.1007/s10035-025-01574-z","url":null,"abstract":"<div><p>Compaction characteristics and maximum dry density control constitute critical considerations for over coarse-grained soil filler. In this study, DEM simulations of surface vibration tests were conducted and parametric analyses were carried out to investigate the effect of maximum particle size and gradation on compaction characteristics and maximum dry density behavior of over coarse-grained soil. The results show that the maximum dry density was positively correlated with the maximum particle size. Pores could be sufficiently filled when the content of small particles reached 25%, and soil skeleton was loosened when the content of small particles exceeded 35%. Giant and medium particles at a low content increased the maximum dry density by replacing small particles and void between them, and forming the soil skeleton when the content exceeded 40%. The increase in maximum dry density caused by small particles filling the pores and the decrease caused by the loosening of soil skeleton result in a peak value of maximum dry density when the content of small particles is between 25 and 35%. The effects of particles in soil can be concluded into four effects: framework effect, filling effect, substitution effect, and loosening effect. This study provides a scientific basis for predicting models and compaction methods of over coarse-grained soil. </p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145037497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The emergence of granular matter features in a system of non-contact magnetic repelling particles. 粒状物质的出现是一个非接触磁排斥粒子系统的特征。

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-10 DOI: 10.1007/s10035-025-01566-z

M. Aguilar-González, L. F. Elizondo-Aguilera, Y. D. Sobral, F. Pacheco-Vázquez

{"title":"The emergence of granular matter features in a system of non-contact magnetic repelling particles.","authors":"M. Aguilar-González, L. F. Elizondo-Aguilera, Y. D. Sobral, F. Pacheco-Vázquez","doi":"10.1007/s10035-025-01566-z","DOIUrl":"10.1007/s10035-025-01566-z","url":null,"abstract":"<div><p>We explored experimentally the static and dynamic behavior of magnetic repelling particles confined in a two-dimensional cell using two particle geometries, namely, disks and rectangular bars. Despite the contactless interaction, typical static features of granular materials are observed for both particle shapes when the material rearranges under the action of gravity: pile formation with an angle of repose, and pressure saturation (Janssen-like effect), which can be explained by considering the magnetically-induced torques that generate friction between particles and confining walls. When the material is forced to be rearranged by compression, particle shape effects become notorious: while disks rearrange increasing the hexagonal ordering, bars augment their orientational ordering forming larger non-contact force chains mediated by the magnetic field; however, in both cases, the resistance to compression rises continuously, in contrast with the fluctuating compression dynamics (stick–slip motion or periodic oscillations) that characterizes granular systems with inter-particle contacts. Our results indicate that continuum approaches of granular materials can be used to characterize the system, despite the contactless interaction and specific shape of the constitutive particles.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Angle of repose, Janssen effect and other features of conventional granular matter are also observed in a system of contactless repelling particles.</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01566-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolution characteristics of normal stress on a silo wall induced by a hyperbolic hopper during discharge 双曲漏斗卸料过程中筒仓壁正应力的演化特征

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-09-10 DOI: 10.1007/s10035-025-01569-w

Yang Han, Zhijun Xu, Zhaoxiang Guo, Huijie Guo, Yuanhao Cheng

{"title":"Evolution characteristics of normal stress on a silo wall induced by a hyperbolic hopper during discharge","authors":"Yang Han, Zhijun Xu, Zhaoxiang Guo, Huijie Guo, Yuanhao Cheng","doi":"10.1007/s10035-025-01569-w","DOIUrl":"10.1007/s10035-025-01569-w","url":null,"abstract":"<div><p>Discrete element method and theoretical analyses were performed to investigate the evolution characteristics of dynamic normal stress on a silo wall with hyperbolic hopper. Results show that the hyperbolic hopper promotes the development of stagnant zone, which avoids the concentration of large dynamic normal stress on a silo wall effectively. Compared with the conical hopper, the hyperbolic hopper reduces the peak normal stress by 14.42%, and increases the range of large normal stress from 0.2 to 0.5 m. The large stagnant zone causes a flow zone with large velocity gradient to develop, which drives the granular materials to flow out from the hyperbolic hopper in an orderly manner, thereby weakening the oscillation strength of the granular materials against silo wall. The hyperbolic hopper weakens the inertial force generated by the instantaneous arch during its formation and breaking, resulting in reducing the dynamic normal stress on silo wall with a hyperbolic hopper.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 4","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145028109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0