Granular Matter最新文献_第6页

Systematic effect of particle roundness/angularity on macro- and microscopic behavior of granular materials 颗粒圆度/角度对颗粒材料宏观和微观行为的系统影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-06-28 DOI: 10.1007/s10035-023-01341-y

Usman Ali, Mamoru Kikumoto, Matteo Ciantia, Ying Cui, Marco Previtali

{"title":"Systematic effect of particle roundness/angularity on macro- and microscopic behavior of granular materials","authors":"Usman Ali, Mamoru Kikumoto, Matteo Ciantia, Ying Cui, Marco Previtali","doi":"10.1007/s10035-023-01341-y","DOIUrl":"10.1007/s10035-023-01341-y","url":null,"abstract":"<div><p>Roundness/angularity is a vital shape descriptor that significantly impacts the mechanical response of granular materials and is closely associated with many geotechnical problems, such as liquefaction, slope stability, and bearing capacity. In this study, a series of biaxial shearing tests are conducted on dual-size aluminum circular and hexagonal rod material. A novel image analysis technique is used to estimate particle kinematics. A discrete element model (DEM) of the biaxial shearing test is then developed and validated by comparing it with the complete experimental data set. To systematically investigate the effect of roundness/angularity on granular behavior, the DEM model is then used to simulate eight non-elongated convex polygonal-shaped particles. Macroscopically, it is observed that angular assemblies exhibit higher shear strengths and volumetric deformations, i.e., dilations. Moreover, a unique relationship is observed between the critical state stress ratio and particle roundness. Microscopically, the roundness shows a considerable effect on rotational behavior such that the absolute mean cumulative rotation at the same strain level increases with roundness. A decrease in roundness results in relatively stronger interlocking, restricting an individual particle’s free rotation. Furthermore, the particles inside the shear band exhibit significantly higher rotations and are always associated with low coordination numbers. Generally, the geometrical shape of a particle is found to have a dominant effect on rotational behavior than coordination number.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01341-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5090544","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: 2

Fracture failure characteristics of porous polycrystalline ice based on the FDEM 基于FDEM的多孔多晶冰断裂破坏特征

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-06-28 DOI: 10.1007/s10035-023-01350-x

Yu Wang, Jinbo Tang, Shuaixing Yan

{"title":"Fracture failure characteristics of porous polycrystalline ice based on the FDEM","authors":"Yu Wang, Jinbo Tang, Shuaixing Yan","doi":"10.1007/s10035-023-01350-x","DOIUrl":"10.1007/s10035-023-01350-x","url":null,"abstract":"<div><p>The finite-discrete element method (FDEM) can be used to simulate brittle materials such as polycrystalline ice with specific geometric information. However, most previous studies treat ice as intact and nonporous, ignoring the effect of internal porosity. In this study, an FDEM model of polycrystalline ice with specific porosity is built by using the cohesive interface element and the method of randomly deleting elements. Comparison with experimental results confirms that the model can capture the strength properties and deformation patterns of polycrystalline ice. The fracture failure patterns and mechanical responses of ice specimens and their relationships with porosity are investigated by uniaxial compression tests and Brazilian splitting tests. The results show that with increasing porosity, the fracture failure patterns of the specimens in the uniaxial compression test evolve into three types: global shear failure, local shear failure and local tensile‒shear failure. There is no obvious difference in the failure patterns of the specimens in the Brazilian splitting test. In addition, as the porosity increases, the material exhibits a transition from brittleness to ductility, and the porosity also affects the local fragmentation characteristics inside the polycrystalline ice, significantly weakening the strength of the specimens.</p><h3>Graphic Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5088125","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

Breakage probability of feed pellet under repeated compression and impacts 进料颗粒在反复压缩和冲击下的破碎概率

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-06-02 DOI: 10.1007/s10035-023-01343-w

Xianrui Kong, Qing Cao, Zihan Zhao, Zhiyou Niu, Jing Liu

{"title":"Breakage probability of feed pellet under repeated compression and impacts","authors":"Xianrui Kong, Qing Cao, Zihan Zhao, Zhiyou Niu, Jing Liu","doi":"10.1007/s10035-023-01343-w","DOIUrl":"10.1007/s10035-023-01343-w","url":null,"abstract":"<div><p>It is a common phenomenon that feed pellet is broken by compression and impact during the processing of manufacturing and production. At present, the breakage characteristics of feed pellet under repeated loading are not clear. In order to predict the breakage probability of feed pellet accurately, the compound feed for piglets feeding was selected to conduct repeated compression and repeated impacts tests in this paper. Firstly, the quasi-static repeated compression tests were conducted, and it was found that the cyclic stiffening occurred due to the densification of feed pellet during the repeated compression. Secondly, the quasi-static repeated compression tests in radial and axial direction were performed under different loading forces. And the results showed that the compressive energy required for feed pellet breakage increased with the decrease of loading force. Then, two-parameter Weibull function was used to fit the relationship between mass-specific compressive energy and breakage probability. And the fitting results R<sup>2</sup> were all greater than 0.9 and the fitting effect was good. Finally, dynamic repeated impacts tests with different impact velocities were conducted. The results showed that the impact times required for feed pellet to reach the same breakage probability decreased, with the increase of impact velocity. Three-parameter Weibull function was used to fit the relationship between mass-specific impact energy and breakage probability. Good fitting effect was obtained and R<sup>2</sup> was greater than 0.95. The fitting results can predict the breakage probability of feed pellet in the process of repeated loading, and provide guidance for the feed pellet production and transportation.</p><h3>Graphical abstract</h3><p>The breakage characteristics of feed pellet under reteated loading</p>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4089743","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 method for coarse graining fluctuation velocities in granular flows 一种计算颗粒流中粗粒波动速度的方法

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-06-01 DOI: 10.1007/s10035-023-01338-7

Neiladri S. Ray, Devang Khakhar

引用次数: 0

Effect of particle size distributions on the mechanical behavior and particle breakage of coral sands 粒径分布对珊瑚砂力学行为及破碎的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-05-13 DOI: 10.1007/s10035-023-01334-x

Kaifeng Zeng, Huabei Liu

{"title":"Effect of particle size distributions on the mechanical behavior and particle breakage of coral sands","authors":"Kaifeng Zeng, Huabei Liu","doi":"10.1007/s10035-023-01334-x","DOIUrl":"10.1007/s10035-023-01334-x","url":null,"abstract":"<div><p>A series of tests was carried out to study the effect of particle size distribution on the mechanical behavior and particle breakage of coral sand. The tested materials had the same origin, and ten different particle-size distributions were used in the tests. Notably, oedometric and isotropic compression tests and monotonic drained and undrained triaxial tests were conducted. Additionally, a simple particle breakage model considering particle size distribution based on the input energy was proposed. The test results showed that the oedometric and isotropic compressibilities of coral sand decreased with increasing uniformity coefficient <i>C</i><sub><i>u</i></sub> but increased with increasing mean particle size <i>D</i><sub><i>50</i></sub> and curvature coefficient <i>C</i><sub><i>c</i></sub>. The effective internal friction angle <i>φ</i>, maximum dilation angle <i>ψ</i><sub><i>max</i></sub> and secant modulus <i>E</i><sub><i>50</i></sub> of coral sand all increased with increasing coefficient <span>(sqrt {C_{u} /C_{c} })</span> but decreased with increasing mean particle size <i>D</i><sub><i>50</i></sub>. The relative density, particle breakage, confining pressure and particle size distribution had negligible influences on the residual friction angle of coral sand. In addition, under the same input energy, the relative breakage <i>B</i><sub><i>r</i></sub> decreased with increasing uniformity coefficient <i>C</i><sub><i>u</i></sub>, increased with increasing mean particle size <i>D</i><sub><i>50</i></sub> and was basically independent of the curvature coefficient <i>C</i><sub><i>c</i></sub>. The proposed particle breakage model could effectively predict the particle breakage trends of coral sands from the same source but with different particle gradations at the stress level used in this study.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4548357","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: 1

Structural transitions in jammed asymmetric bidisperse granular packings 堵塞非对称双分散颗粒填料中的结构转变

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-05-08 DOI: 10.1007/s10035-023-01329-8

Juan C. Petit, Matthias Sperl

{"title":"Structural transitions in jammed asymmetric bidisperse granular packings","authors":"Juan C. Petit, Matthias Sperl","doi":"10.1007/s10035-023-01329-8","DOIUrl":"10.1007/s10035-023-01329-8","url":null,"abstract":"<div><p>We study the local structural changes along the jamming transitions in asymmetric bidisperse granular packings. The local structure of the packing is assessed by the contact orientational order, <span>(tilde{Q}_{ell })</span>, that quantifies the contribution of each contact configuration (Large–Large, Small–Small, Large–Small, Small–Large) in the jammed structure. The partial values of <span>(tilde{Q}_{ell })</span> are calculated with respect to known ordered lattices that are fixed by the size ratio, <span>(delta )</span>, of the particles. We find that the packing undergoes a structural transition at <span>(phi _J)</span>, manifested by a sudden jump in the partial <span>(tilde{Q}_{ell })</span>. Each contact configuration contributes to the jammed structure in a different way, changing with <span>(delta )</span> and concentration of small particles, <span>(X_{textrm{S}})</span>. The results show not only that the packing undergoes a structural change upon jamming, but also that bidisperse packings exhibit local HCP and FCC structures also found in monodisperse packings. This suggests that the jammed structure of bidisperse systems is inherently endowed with local structural order. These results are relevant in understanding how the arrangement of particles determines the strength of bidisperse granular packings.</p><h3>Graphic abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01329-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4356435","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: 1

A model packing based on a tree of face-to-face regular tetrahedra for monodisperse spheres 基于面对面正四面体树的单分散球体模型填充

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-05-06 DOI: 10.1007/s10035-023-01331-0

Alain de Ryck

引用次数: 0

Correction to: Effect of gas permeation and consolidation stress evolution on powder flow properties in the gas pressurization process 修正:气体加压过程中气体渗透和固结应力演化对粉末流动特性的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-05-05 DOI: 10.1007/s10035-023-01332-z

Bing Luo, Xin Wang, Minghao You, Cai Liang, Daoyin Liu, Jiliang Ma, Xiaoping Chen

引用次数: 0

Inertial effects in just-saturated axisymmetric column collapses 刚饱和轴对称柱崩塌的惯性效应

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-05-03 DOI: 10.1007/s10035-023-01326-x

William Webb, Charles Heron, Barbara Turnbull

{"title":"Inertial effects in just-saturated axisymmetric column collapses","authors":"William Webb, Charles Heron, Barbara Turnbull","doi":"10.1007/s10035-023-01326-x","DOIUrl":"10.1007/s10035-023-01326-x","url":null,"abstract":"<div><p>This work introduces a scaling analysis of sub-aerial axisymmetric column collapses of glass beads and Newtonian glycerol-water solutions mimicking some of the behaviours of debris flows. The beads were in a size range where their inertia partly decouples their collapse behaviour from the water column. Experiments explored a range of viscous, surface tension and particle inertia effects through systematic variation of particle size and fluid viscosity. Crucially a geotechnical centrifuge was used to access elevated effective gravitational accelerations driving the collapse, allowing field-scale viscous and surface tension effects to be replicated. Temporal pore pressure and run out front position evolution data was extracted using a pressure transducer and high speed imaging, respectively. A least-squares fitted scale analysis demonstrated that all characteristic dimensionless quantities of the acceleration phase could be described as a function of the column-scale Bond number <span>(text{ Bo })</span>, the Capillary number <span>(text{ Ca })</span>, the system size <span>(r^*)</span>, and the grain-fluid density ratio <span>(rho ^*)</span>. This analysis demonstrated that collapses as characterised by pore pressure evolution and front positions were controlled by the ratio of <span>(text{ Bo}/text{Ca})</span>. This indicates that grain-scale surface tension effects are negligible in such inertial column collapses where they may dominate laboratory-scale granular-fluid flow behaviour where geometric similarity between grain and system size is preserved.</p><h3>Graphical abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":582,"journal":{"name":"Granular Matter","volume":"25 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-023-01326-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4134882","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

Closed-form displacement field equations for a disc subjected to self-equilibrated arbitrary loads 受自平衡任意载荷作用的圆盘的闭式位移场方程

IF 2.4 3区工程技术

Granular Matter Pub Date : 2023-04-30 DOI: 10.1007/s10035-023-01327-w

K. Shins, K. Ramesh

引用次数: 0