Granular Matter最新文献_第4页

Mesoscopic mechanics and microstructural evolution of triaxially compressed polydisperse pebbles: insights from DEM modeling 三轴压缩多分散卵石的细观力学和微观结构演化：来自DEM模型的见解

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-27 DOI: 10.1007/s10035-025-01550-7

Deepak K. Pawar, Ratna Kumar Annabattula, Narasimhan Swaminathan

{"title":"Mesoscopic mechanics and microstructural evolution of triaxially compressed polydisperse pebbles: insights from DEM modeling","authors":"Deepak K. Pawar, Ratna Kumar Annabattula, Narasimhan Swaminathan","doi":"10.1007/s10035-025-01550-7","DOIUrl":"10.1007/s10035-025-01550-7","url":null,"abstract":"<div><p>A computational framework that utilizes the discrete element method (DEM) was developed to conduct triaxial compression tests on lithium-based pebbles. In addition, the process for determining optimized simulation parameters for performing stress-controlled numerical hydrostatic and triaxial compression tests using LIGGGHTS has been outlined. This framework was employed to study the influence of the polydispersity of pebbles on the Drucker-Prager (D-P) parameter, which is the friction angle. The study revealed that the effect of polydispersity, measured by the polydispersity index (<span>(lambda )</span>) was negligible, as the value of friction angle (<span>(beta )</span>) remained constant at <span>(approx 29^circ )</span> for <span>(lambda le 0.5)</span>. However, in highly polydisperse samples with <span>(lambda =0.8)</span>, <span>(beta )</span> increased to <span>(approx 31^circ )</span>. Additionally the dilatancy angle (<span>(psi )</span>) decreases as <span>(lambda )</span> increases. The difference between <span>(beta )</span> and <span>(psi )</span> increases with <span>(lambda )</span>, and thus, the associative flow rule is not suitable for highly polydisperse samples. To conduct a more detailed analysis of the mesoscopic mechanics, three parameters based on the mean number of contacts, which governed the microstructural similarity of the sample and the extent of particle participation, were examined. Additionally, two local parameters based on Voronoi tessellation were investigated. These parameters highlight how changing <span>(lambda )</span> influences the local deformation and characterizes the local structural variation in the granular samples. In particular it was found that, the participation of particles to the total deformation was higher in samples with high polydispersity.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145170689","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

Representations of major physical statistics of windblown sand in the atmospheric surface layer 大气表层风沙的主要物理统计表示

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-26 DOI: 10.1007/s10035-025-01544-5

Tian-Li Bo, Si-Jiang Liu

{"title":"Representations of major physical statistics of windblown sand in the atmospheric surface layer","authors":"Tian-Li Bo, Si-Jiang Liu","doi":"10.1007/s10035-025-01544-5","DOIUrl":"10.1007/s10035-025-01544-5","url":null,"abstract":"<div><p>The streamwise and vertical wind speed fluctuations predicted by a multi-scale wind speed fluctuation prediction model were introduced into a one-dimensional windblown sand model to simulate windblown sand under different friction velocities and particle sizes. And the scaling relation of major physical statistics was studied. Our results show that the mean and standard deviation of sand transport rate and average saltation velocity are proportional to <i>u</i><sub>*</sub><sup>3</sup>/<i>g</i>. The mean and standard deviation of average saltation length are proportional to<i> u</i><sub>*</sub><sup>2</sup>/<i>g</i>. The mean and standard deviation of speed and angle distribution of lift-off sand particles over time also need to consider friction velocity (<i>u</i><sub>*</sub>) and particle size. Here, <i>g</i> represents the gravitational acceleration. Empirical representations of mean and standard deviation of these five statistics were obtained based on the scaling relation, and the variations of coefficients with dimensionless particle size were mainly considered. Empirical representations provide a basis for simulating windblown sand over a large spatial range and introducing turbulent motions in the study of aeolian landforms.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Distribution of the mean of lift-off speed under different frictional wind speeds.</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169833","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

Effect of vibration assistance on the force chain properties of dense granular flow between friction interfaces 振动辅助对摩擦界面间致密颗粒流力链特性的影响

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-26 DOI: 10.1007/s10035-025-01554-3

Qigao Feng, Guiling Hu, Zichen Gan, Lijie Ma, Minghua Pang, Yaxin Liu, Leyang Li

{"title":"Effect of vibration assistance on the force chain properties of dense granular flow between friction interfaces","authors":"Qigao Feng, Guiling Hu, Zichen Gan, Lijie Ma, Minghua Pang, Yaxin Liu, Leyang Li","doi":"10.1007/s10035-025-01554-3","DOIUrl":"10.1007/s10035-025-01554-3","url":null,"abstract":"<div><p>In order to elucidate the lubrication mechanism of dense granular flows under vibrational conditions, the force chain characteristics of dense particulate systems were systematically investigated. A parallel inter-plate model for dense granular flow lubrication was established using the discrete element method (DEM). Subsequently, the effects of vibration frequency and amplitude on the dynamic fluctuation, load-bearing capacity, distribution, and overall directionality of force chains were analyzed in detail. When the frequency is below mid-frequency (10,000 Hz), the dynamic fluctuations of force chains in the same-phase direction are weaker, and the overall fluctuation properties of the force chains tend to stabilize. The distribution and load-bearing capacities of weak force chains increase, and the directionality of the total force chain gradually aligns with the x-axis. Conversely, when the frequency exceeds 10,000 Hz, stronger fluctuations of force chains occur in both phases, leading to more intense overall fluctuations. Simultaneously, the distribution and load-bearing capacities of weak force chains decrease, and the directionality of the total force chain shifts gradually from the x-axis to the y-axis. As the vibration frequency and amplitude increase, the distribution and load-bearing capacities of weak force chains reach their maximum values more rapidly under mid-frequency conditions. Additionally, the average and fluctuating velocities increase continuously at low frequencies, peak at mid-frequencies, and then decrease at high frequencies. The primary contribution of this study is to establish a theoretical foundation for the lubrication mechanism of granular flows under vibrational influences.</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 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169834","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

Research on the influence of press-loading process on the quality of arc-shaped charges in warheads 压装过程对战斗部弧形装药质量的影响研究

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-25 DOI: 10.1007/s10035-025-01540-9

Yuhao Wang, Shutao Wang, Shuhong Ba

{"title":"Research on the influence of press-loading process on the quality of arc-shaped charges in warheads","authors":"Yuhao Wang, Shutao Wang, Shuhong Ba","doi":"10.1007/s10035-025-01540-9","DOIUrl":"10.1007/s10035-025-01540-9","url":null,"abstract":"<div><p>The energy generated by the explosion of the arc-shaped charge spreads relatively evenly in all directions, when the density of the explosive charge is uniform and compact, the energy released by the reaction is more concentrated and stable, thereby achieving a more efficient explosion effect. By establishing a simulation model of the powder compaction process, the powder displacement, relative density variation, and stress distribution of the formed explosive charge during its compaction process were analyzed, and the effects of process parameters such as pressing rate, pressure holding time, number of compaction times, and mold roughness on the density of arc-shaped charges were studied. The results show that: The stress of the formed explosive column is mainly concentrated at the bottom end of the upper die punch; From top to bottom, the relative density of the explosive charge shows a wave-like decreasing trend, and the minimum density appears at the interface between the lower die punch and the female mold; In the complete compaction process, the influence of different compaction rates and pressure holding times on the density of the formed explosive column does not follow an obvious pattern. However, it is certain that the pressure holding process is crucial, as it can enhance the density and uniformity of the explosive column; With an increase in the number of compaction times, the relative density of the explosive charge gradually increases; Reducing the roughness of the mold can make the density distribution of the formed explosive column more uniform.</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 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169816","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

Validation and calibration of parameters sunflower seeds-soil 葵花籽-土壤参数的验证与校准

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-25 DOI: 10.1007/s10035-025-01553-4

Xuan Zhao, Hongbin Bai, Fei Liu, Wenxue Dong

{"title":"Validation and calibration of parameters sunflower seeds-soil","authors":"Xuan Zhao, Hongbin Bai, Fei Liu, Wenxue Dong","doi":"10.1007/s10035-025-01553-4","DOIUrl":"10.1007/s10035-025-01553-4","url":null,"abstract":"<div><p>To enhance the mechanical seeding performance of sunflowers and improve seed delivery efficiency, this study measured the adhesion force and angle of repose between sunflower seeds and soil at varying moisture contents through physical experiments. A discrete element model (DEM) was developed to analyze the interaction between soil and sunflower seeds, with the angle of repose as the response variable. The Plackett–Burman (PB) Design was utilized to identify significant influencing factors, and a combination of Response Surface Methodology (RSM) and Feedforward Neural Network (FNN) was employed for optimization. The results indicated that FNN provided higher prediction accuracy and stability. Specifically, at soil moisture contents of 10%, 14%, 18%, and 20%, the static friction coefficients were 0.67, 0.74, 0.66, and 0.63; dynamic friction coefficients were 0.45, 0.46, 0.38, and 0.36; surface energies were 1.18, 2.11, 3.6, and 4.99; and angles of repose were 37.58°, 40.22°, 41.56°, and 41.81°. The absolute errors from physical experiments were 0.59%, 0.6%, 0.82%, and 0.46%, respectively. These findings demonstrate that the FNN model can effectively predict simulation parameters for sunflower seeds and soil under varying moisture conditions, providing a theoretical foundation for field crop seeding processes.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145169805","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

Vibrocompaction behaviour of dry granular matter depends on the dynamic to static stress ratio 干粒状物的振压特性取决于动、静应力比

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-18 DOI: 10.1007/s10035-025-01539-2

Moritz Wotzlaw, Daniel Aubram, Frank Rackwitz

{"title":"Vibrocompaction behaviour of dry granular matter depends on the dynamic to static stress ratio","authors":"Moritz Wotzlaw, Daniel Aubram, Frank Rackwitz","doi":"10.1007/s10035-025-01539-2","DOIUrl":"10.1007/s10035-025-01539-2","url":null,"abstract":"<div><p>The mechanical behaviour of dry granular materials is strongly influenced by the effects of cyclic accelerations caused by vibrations. While the shear strength is temporarily reduced for the duration of the vibration, the bulk density is permanently increased. Although these phenomena have been known for a long time, the underlying mechanisms are not yet fully understood. This work contributes to a better understanding of the compaction of dry granular materials by vertical vibrations by introducing a new dimensionless parameter in the form of the ratio of dynamic to static stresses inside the granulate. With the help of numerical simulations using the discrete element method, a parametric study shows that this stress ratio is better suited than the conventionally used acceleration ratio to characterise the essential compaction properties of the material. An analytical model for the stress distribution in the granulate is presented and employed alongside with laboratory tests to validate the numerical model. The problem is treated here in one dimension, but an extension to three dimensions is possible.</p><h3>Graphical abstract</h3><p>A granular sample subject to gravity, a static surcharge and vibrational accelerations (left). The dynamic to static stress ratio grows non-linearly with depth and correlates to the local void ratio after vibrations (right).</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01539-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166390","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

Heterarchical granular dynamics 分层颗粒动力学

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-18 DOI: 10.1007/s10035-025-01541-8

Benjy Marks, Shivakumar Athani, Itai Einav

引用次数: 0

Effect of inherent anisotropy of granular materials on the active and passive arching effect 颗粒材料固有各向异性对主动和被动拱效应的影响

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-18 DOI: 10.1007/s10035-025-01547-2

Mingzhe Zhou, Haiying Fu, Junnan Ren, Yanyan Zhao

{"title":"Effect of inherent anisotropy of granular materials on the active and passive arching effect","authors":"Mingzhe Zhou, Haiying Fu, Junnan Ren, Yanyan Zhao","doi":"10.1007/s10035-025-01547-2","DOIUrl":"10.1007/s10035-025-01547-2","url":null,"abstract":"<div><p>This paper analyzed the influence of the inherent anisotropy of sand on active and passive arching by simulating the trapdoor emplying the discrete element method (DEM). The inherent anisotropy is reflected by the bedding plane angle <i>α</i> of particles. The granular material constitutive responses are captured on representative volume elements (RVEs). A new modeling method is employed to prepare particle specimens, aiming to obtain a more uniform soil model. The results indicate that the discrete element method can simulate the influence of the inherent anisotropy of granular material on the evolution of soil arching. An asymmetric arching evolution phenomena is observed in the <i>α</i> other than 0° or 90° cases, which leads to obvious asymmetric deformation and stress distribution in the soil. As the filling height increases, this phenomenon becomes more and more obvious. From a microscopic perspective, the reorientation of the contact normal fabric caused by particle rotation is the main reason for the differences in soil arching evolution with different <i>α</i>. This study provides a theoretical basis for predicting ground deformation failure caused by underground engineering activities and changes in surrounding environmental conditions. </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 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166392","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

Mobility of cohesive granular flows over erodible beds: insights from discrete element simulations 可蚀层上粘性颗粒流的流动性：来自离散元模拟的见解

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-10 DOI: 10.1007/s10035-025-01524-9

Camille Ligneau, Betty Sovilla, Johan Gaume

{"title":"Mobility of cohesive granular flows over erodible beds: insights from discrete element simulations","authors":"Camille Ligneau, Betty Sovilla, Johan Gaume","doi":"10.1007/s10035-025-01524-9","DOIUrl":"10.1007/s10035-025-01524-9","url":null,"abstract":"<div><p>Gravitational mass movements represent a serious threat for populations and infrastructures. Their dynamics are influenced by topography, mechanical and rheological properties of the flowing material, and the potential erosion or entrainment of bed material. A longstanding challenge involves theorizing the complex influence of material rheology and entrainment on avalanche mobility to improve predictions of flow run-out and impact, crucial for hazard assessment. To enhance process understanding and improve snow avalanche physics-based models, we investigate the interplay between cohesion and entrainment on the mobility of cohesive granular flows over an erodible bed. We conducted 2D DEM simulations of an avalanche slope where cohesive granular materials release and flow over continuous erodible beds of bonded particles. A comprehensive sensitivity analysis focused on the influence of released mass, cohesion, and maximum erodible depth on avalanche mobility and entrainment rate. Our results indicate that inter-particle cohesion significantly influences flow mobility, with highly cohesive beds exhibiting limited entrainment rates and run-out distances. The study reveals that the propensity of particles to form new cohesive bonds during flow significantly affects mobility. Instances where bond formation is feasible (adhesive) show considerably lower mobility and entrained mass compared to scenarios where bonds cannot form during flow (non-adhesive). Finally, we propose a scaling law relating the ratio between actual and maximum entrainment rates to the ratio between bed cohesion and a pressure term accounting for dynamic and gravitational contributions. This study enhances our understanding of geophysical mass flow dynamics and highlights the crucial role of cohesion and entrainment in flow mobility.</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 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01524-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164411","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

Soil fabric of coarse-grained soils sedimented under water and its relation to relative density and excess pore water pressure 水沉粗粒土的土体结构及其与相对密度和超孔隙水压力的关系

IF 2.9 3区工程技术

Granular Matter Pub Date : 2025-06-09 DOI: 10.1007/s10035-025-01535-6

Božana Baćić, Ivo Herle, Martin Oppermann

{"title":"Soil fabric of coarse-grained soils sedimented under water and its relation to relative density and excess pore water pressure","authors":"Božana Baćić, Ivo Herle, Martin Oppermann","doi":"10.1007/s10035-025-01535-6","DOIUrl":"10.1007/s10035-025-01535-6","url":null,"abstract":"<div><p>The soil fabric varies significantly depending on the deposition process that forms the grain skeleton. Each deposition method produces a specific type of soil fabric, which can be linked to a particular soil density. When represented as relative density, determined using limit densities from standard index tests, a wide range of relative densities can be observed for different sands produced by the same deposition method. The influence of this variation in relative density, resulting from a single deposition method, on the development of the excess pore water pressure (PWP) should be further investigated. A fast testing of the excess PWP accumulation in sandy soils during undrained cyclic shearing can be easily performed using the newly developed PWP Tester. In the PWP Tester, specimens are prepared through sedimentation in water, which yields a comparable fabric in different sands but significantly different relative densities. Despite these relative density differences, the rate of the excess PWP evolution during undrained shearing is remarkably similar among different sands. This indicates that relative density should not be regarded as a primary factor influencing the development of the excess PWP and that the soil fabric plays equal or even a greater role.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 3","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-025-01535-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163289","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