Granular Matter最新文献_第4页

The influence of surface roughness on the shear mechanical behavior of 2 mm spherical particle materials 表面粗糙度对2mm球形颗粒材料剪切力学行为的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-19 DOI: 10.1007/s10035-024-01497-1

Meng Miao, Fengyin Liu, Yu Yin, Yuqing Tang, Lijia Zhong

{"title":"The influence of surface roughness on the shear mechanical behavior of 2 mm spherical particle materials","authors":"Meng Miao, Fengyin Liu, Yu Yin, Yuqing Tang, Lijia Zhong","doi":"10.1007/s10035-024-01497-1","DOIUrl":"10.1007/s10035-024-01497-1","url":null,"abstract":"<div><p>Using glass beads as an ideal material analogous to soil particles makes it feasible to explore the effects of particle interactions on the mechanical behavior of the material. In this study, 2 mm high-precision spherical glass beads were selected as the raw material, and three test samples with varying surface roughness were produced using sandblasting technology. After quantifying the surface roughness of the particles, samples were prepared, and a series of laboratory triaxial consolidation drainage tests were conducted to investigate the shear behavior of particle materials with varying roughness levels. This investigation explores the effects of variations in particle surface roughness on the stress–strain characteristics, shear strength, critical state, and stick–slip behavior of triaxial samples. The experimental results indicate that an increase in particle surface roughness significantly raises the peak deviatoric stress, and the stress–strain curves predominantly exhibit strain softening behavior. Additionally, the slope of the critical state line increases, and the stick–slip behavior becomes less pronounced. The variation trend of the roughness index is similar to peak friction angle (<i>φ</i><sub>max</sub>), peak deviatoric stress growth rate, slope (k) of the critical state line, and the maximum deviatoric stress drop (Δ<sub>qmax</sub>) during stick–slip process.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142845063","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

Viscoplastic modelling of rate-dependent pile penetration in crushable sand 可碾压砂中随速率变化的桩基贯入的粘塑性建模

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-13 DOI: 10.1007/s10035-024-01499-z

Soukat Kumar Das, Arghya Das

{"title":"Viscoplastic modelling of rate-dependent pile penetration in crushable sand","authors":"Soukat Kumar Das, Arghya Das","doi":"10.1007/s10035-024-01499-z","DOIUrl":"10.1007/s10035-024-01499-z","url":null,"abstract":"<div><p>This work examines how crushable sand responds to the different quasi-static constant rates of pile penetration. A breakage mechanics-based viscoplastic constitutive model simulates plane strain pile driving in sand, focusing on how the penetration rate affects particle crushing at the pile tip. Finite element modelling (FEM) is used to simulate the pile granular media interaction in 2D. The model, which links the macro and micro aspects of granular media, predicts the behaviour of particle crushing and material strength at different rates of pile penetration. Input parameters are calibrated based on experimental sand samples. The results show that piles driven at higher rates have greater strength and less particle breakage. In contrast, piles with slower penetration rates show more breakage and reduced strength, with stress and breakage accumulating most at the pile tip corners. Also, the impact of the penetration rate on shear resistance force is more evident along the pile length, but it is reduced at the ends because of crushing-induced particle rearrangement and resultant loss of contacts. This study provides important insights into the behaviour of granular media in geotechnical applications like pile driving, highlighting how different penetration rates can influence crushable granular media response.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142821489","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

Influence of the contact model on energy fluctuations in non-cohesive granular materials subjected to confinement axial cyclic loading using DEM 基于DEM的接触模型对约束轴向循环加载下非粘性颗粒材料能量波动的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-11 DOI: 10.1007/s10035-024-01478-4

Haleh Meshkinghalam, Mehrdad Emami Tabrizi, Mohammad Reza Chenaghlou

{"title":"Influence of the contact model on energy fluctuations in non-cohesive granular materials subjected to confinement axial cyclic loading using DEM","authors":"Haleh Meshkinghalam, Mehrdad Emami Tabrizi, Mohammad Reza Chenaghlou","doi":"10.1007/s10035-024-01478-4","DOIUrl":"10.1007/s10035-024-01478-4","url":null,"abstract":"<div><p>The discrete element method (DEM) is widely used to investigate the micromechanical behavior of granular materials. The accuracy of numerical modelling using this method depends greatly on the correct selection of the components of the rheological model. On the other hand, the rheological model is affected by the geometric shape, movement, and constituent particular materials. In this study, the stored and dissipated energy variations in the granular media in linear and non-linear contact models, as well as the change of the damping coefficient at the contact points under cyclic loading, were studied. The numerical model with linear and non-linear contact models was studied in four cases including the application of the normal and shear damping coefficient, and both normal and shear dashpots with the same and different values. The results showed that in the linear contact model, when the damping coefficient was applied only in the normal direction, the energy level was lower than the other three cases. However, in the non-linear model, all four cases had almost the same behavior. In the linear model, the amount of dissipated energy due to viscous damping was more than dissipated energy due to the friction sliding. However, in the non-linear model, dissipated energy due to sliding was more than the dissipated energy due to viscous damping.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142810971","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

Understanding shear bands in granular media through in-plane ploughing experiments at different strain rates 通过不同应变速率下的面内翻耕试验了解颗粒介质中的剪切带

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-09 DOI: 10.1007/s10035-024-01489-1

Sudhanshu Rathore, Abhijit Hegde, Tejas G. Murthy

{"title":"Understanding shear bands in granular media through in-plane ploughing experiments at different strain rates","authors":"Sudhanshu Rathore, Abhijit Hegde, Tejas G. Murthy","doi":"10.1007/s10035-024-01489-1","DOIUrl":"10.1007/s10035-024-01489-1","url":null,"abstract":"<div><p>An experimental study is made to understand the deformation characteristics and failure mechanism of sands subjected to severe plastic deformation in the ploughing model setup of in-plane orthogonal cutting. The cutting experiments were performed on sands over 3 orders of strain rates. High-speed imaging and concomitant image analysis were performed using the Particle Image Velocimetry algorithm to obtain the whole field velocity measurements of the material flow. The velocity field maps of the near tool tip region demonstrate a sharp change in the motion of sand particles along with the formation of a dead zone. The effective strain rate maps show regions of intense localized plastic deformation- termed “shear bands”. The inclination angle of these bands evolved periodically with time and showed a decreasing trend due to an increase in the surcharge and effective depth of cut. The morphology and overall characteristics of these mesoscale structures (shear bands) do not change significantly with strain rate. The cutting force signatures were oscillatory and suggested cyclic material softening (dilation)—hardening (compaction) ahead of the tool, which is also reflected in the periodic repositioning of shear bands. The limit equilibrium-based model was adequate to predict the tool-cutting forces well, even with the significant variation in strain rates.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798440","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

Using tracer particle kinematics to sense particle size in rotating drums 利用示踪粒子运动学检测旋转滚筒中的颗粒大小

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-06 DOI: 10.1007/s10035-024-01493-5

Sudip Laudari, Benjy Marks, Pierre Rognon

{"title":"Using tracer particle kinematics to sense particle size in rotating drums","authors":"Sudip Laudari, Benjy Marks, Pierre Rognon","doi":"10.1007/s10035-024-01493-5","DOIUrl":"10.1007/s10035-024-01493-5","url":null,"abstract":"<div><p>Comminution is an energy intensive process. In SAG-mills, it is achieved by rotating a drum in which large metal balls crush ore particles. In-situ monitoring of particle size would be of considerable interest to optimize their operation. However, there is no established solution to measure particle size in such a harsh mechanical environment. We show here that the acceleration of the grinding media, which can be monitored using embedded accelerometers, can be used to sense the particle size and size distribution during operation. In DEM simulations, we find that a machine learning classifier is able to detect the size and distribution of small particles solely based on the knowledge of the acceleration of larger grinding media particles. Results show that this kinematic sensing is effective over a wide range of particle size ratios, size distribution, mixture ratio and mill charge. Beyond their potential applications in mineral processing, these results point out that the kinematics of large particles is affected by the size of the smaller particles, an observation which can help advance rheological models for bi-disperse granular flows.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01493-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142789171","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

Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element method 基于离散元法的新型链板土壤修复装置中土壤剂颗粒分布优化

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-04 DOI: 10.1007/s10035-024-01483-7

Zhipeng Wang, Tong Zhu, Youzhao Wang, Dezheng Liu, Feng Ma, Chaoyue Zhao, Xu Li, Yanping Zhang

{"title":"Optimisation of soil-agent particle distribution in a new chain plate soil remediation device based on discrete element method","authors":"Zhipeng Wang, Tong Zhu, Youzhao Wang, Dezheng Liu, Feng Ma, Chaoyue Zhao, Xu Li, Yanping Zhang","doi":"10.1007/s10035-024-01483-7","DOIUrl":"10.1007/s10035-024-01483-7","url":null,"abstract":"<div><p>To improve the working efficiency of in-situ soil remediation equipment, this paper designs a new type of chain plate soil remediation equipment based on the working principle and technical requirements. The mixing process of soil and chemicals under different parameters was investigated using the discrete element method and the orthogonal test method. The experimental designs were all based on horizontal movement speed, chain knife speed, screw speed, and homogeneous mixing pitch as test factors and discrete coefficient and soil fragmentation rate as indices. The test method uses a unidirectional test to determine the value of the reference centre level for the orthogonal test and a combined balancing method to determine and validate the optimum parameters of the soil remediation device. The optimised parameters were determined as follows: the horizontal movement speed of the mechanism is 0.15 m/s, the rotational speed of the chain knife is 5.25 m/s, the rotational speed of the screw is 187.5 rpm, and the homogeneous mixing pitch is 98 mm, respectively. The dispersion coefficient was reduced by 7.43% and the soil fragmentation rate increased by 5.45% compared to the operating parameters of the baseline group.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778300","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

A thermodynamic critical state model for sands 砂的热力学临界状态模型

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-12-04 DOI: 10.1007/s10035-024-01492-6

Hongjun Li, Zhichao Zhang

{"title":"A thermodynamic critical state model for sands","authors":"Hongjun Li, Zhichao Zhang","doi":"10.1007/s10035-024-01492-6","DOIUrl":"10.1007/s10035-024-01492-6","url":null,"abstract":"<div><p>A thermodynamics-based constitutive model predicting the critical state behavior of sands is developed in this paper. The model includes hyperelastic and plastic constitutive relations derived from thermodynamics. Using the concept of elastic potential, hyperelastic relations are derived to describe the stress- and -density dependency of the elastic stiffness of sands, which naturally lead to the elastic limit with stress-induced anisotropy in effective stress space. The plastic constitutive relations coupled with the nonlinear hyperelasticity are then derived based on the energy dissipations and the second law of thermodynamics. The model is capable of predicting the critical state behavior of sands without concepts of yield surface and plastic potential surface. The model is validated by predicting the undrained shear behavior of Toyoura sand. The modeling results show that different patterns of undrained shear response, such as the pure dilation type, the contraction-dilation type with hardening, the contraction-dilation type with softening, and the pure contraction type, can be well captured by the model, depending on the confining pressure and the void ratio. The distinctions of contraction/dilation and critical state behavior between triaxial compression and extension are also predicted. It is shown that the critical state behavior of sand is the combined results of the pressure/density/path-dependent hyperelasticity and plasticity coupled with each other.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778301","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 powder particle size on the microscopic morphology and mechanical properties of 316 L stainless steel hollow spheres 粉末粒度对316l不锈钢空心球微观形貌和力学性能的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-29 DOI: 10.1007/s10035-024-01495-3

Jianliang Li, Xu Cui, Qianfei Sun, Chunhuan Guo, Fengchun Jiang, Hexin Zhang

{"title":"Effect of powder particle size on the microscopic morphology and mechanical properties of 316 L stainless steel hollow spheres","authors":"Jianliang Li, Xu Cui, Qianfei Sun, Chunhuan Guo, Fengchun Jiang, Hexin Zhang","doi":"10.1007/s10035-024-01495-3","DOIUrl":"10.1007/s10035-024-01495-3","url":null,"abstract":"<div><p>316 L stainless steel powder with varying particle sizes was chosen as the raw material for the fabrication of metal hollow spheres using powder metallurgy techniques. The powder’s particle size, composition, and micro-morphology were examined, followed by porosity and capillary force calculations, compressive testing, and fracture analysis. The findings reveal significant disparities in the micro-morphology and mechanical properties among the metal powders with different particle sizes. Smaller particle sizes result in denser bonding of the hollow spheres, leading to higher compressive yield strength. Conversely, larger powder particle sizes substantially increase the porosity of the hollow sphere wall, resulting in a sharp decline in mechanical properties and a transition from ductile fracture to brittle fracture in its failure mode. This study’s innovation lies in its meticulous examination of the relationship between particle size distribution and the resulting microstructural and mechanical properties of 316 L stainless steel hollow spheres, providing valuable data that enhances the understanding of powder metallurgy processes and drives the development of advanced materials for aerospace applications.</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 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142754024","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

On response of laterally loaded granules within retaining structure 关于挡土结构内横向加载颗粒的反应

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-28 DOI: 10.1007/s10035-024-01484-6

Wentao Hu, Shenghong Zhang, Jin Xiao, Yuyuan Zhu

引用次数: 0

Effects of aggregate crushing and strain rate on fracture in compressive concrete with a DEM-based breakage model 利用基于 DEM 的断裂模型分析骨料破碎和应变率对抗压混凝土断裂的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-26 DOI: 10.1007/s10035-024-01487-3

Michal Nitka, Jacek Tejchman

{"title":"Effects of aggregate crushing and strain rate on fracture in compressive concrete with a DEM-based breakage model","authors":"Michal Nitka, Jacek Tejchman","doi":"10.1007/s10035-024-01487-3","DOIUrl":"10.1007/s10035-024-01487-3","url":null,"abstract":"<div><p>This study looked at how breakable aggregates affected the mesoscopic dynamic behavior of concrete in the uniaxial compression condition. In-depth dynamic two-dimensional (2D) studies were conducted to examine the impact of aggregate crushing and strain rate on concrete’s dynamic strength and fracture patterns. Using a DEM-based breakage model, concrete was simulated as a four-phase material consisting of aggregate, mortar, ITZs, and macropores. The concrete mesostructure was obtained from laboratory micro-CT tests. Collections of spherical particles were used to imitate aggregate breakage of different sizes and shapes by enabling intra-granular fracturing between them. The mortar was described in terms of unbreakable spheres with different diameters. Compared to the mortar, the aggregate strength was always stronger. A qualitative consistency was achieved between the DEM results and the available experimental data. Concrete’s dynamic compressive strength rose significantly with strain rate and just somewhat with aggregate strength. The fracture process was impacted considerably by aggregate crushing and strain rate. The number of broken contacts grew with an increase in strain rate and a decrease in aggregate strength.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01487-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714528","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