Granular Matter最新文献_第3页

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

Reducing segregation in vibrated binary-sized granular mixtures by excessive small particle introduction 通过过度引入小颗粒减少振动双元粒状混合物中的偏析现象

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-20 DOI: 10.1007/s10035-024-01476-6

Fumiaki Nakai, Kiwamu Yoshii

{"title":"Reducing segregation in vibrated binary-sized granular mixtures by excessive small particle introduction","authors":"Fumiaki Nakai, Kiwamu Yoshii","doi":"10.1007/s10035-024-01476-6","DOIUrl":"10.1007/s10035-024-01476-6","url":null,"abstract":"<div><p>We numerically examine binary-sized granular mixtures confined between two parallel walls subjected to vertical vibration using the discrete element method. For a size ratio of 3 between large and small particles, we study the structure of large particles in moderately dense regimes where the combined two-dimensional packing fractions of both particle sizes exceed 1. When the fraction of small particles is small, segregation of the large particles occurs. In contrast, as the fraction of small particles increases, an effective repulsion between the large particles emerges over distances greater than the large particle diameter, suppressing their segregation. The emergence of reduction in segregation is confirmed for another size ratio, vibrational acceleration, system size, and for a case of bidisperse size distribution. Additionally, at the size ratio of 3, the effective repulsion induces a hexagonal phase of the large particles at packing fractions lower than in mono-component systems. This work will provide a fresh insight into granular physics, prompting further experimental and theoretical study.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>This article numerically investigates the structures of quasi-two-dimensional binary-sized granular mixtures under vibration, and finds that segregation is reduced with increasing packing fraction of small particles</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01476-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142679562","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 conductivity and shrinkage characteristics of bentonite-fly ash and bentonite-sand backfill material 膨润土-粉煤灰和膨润土-砂回填材料的导热性和收缩特性

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-19 DOI: 10.1007/s10035-024-01482-8

Pawan Kishor Sah, Shiv Shankar Kumar

{"title":"Thermal conductivity and shrinkage characteristics of bentonite-fly ash and bentonite-sand backfill material","authors":"Pawan Kishor Sah, Shiv Shankar Kumar","doi":"10.1007/s10035-024-01482-8","DOIUrl":"10.1007/s10035-024-01482-8","url":null,"abstract":"<div><p>Thermal backfill is an integrated part of underground electrical cable infrastructures systems, ground heat source pumps and radioactive waste repositories, as it minimizes resistance to heat transfer away from these systems. The heat transfer capacity and current carrying capability of underground electrical cables are significantly affected by thermal conductivity of backfill material and the surrounding soil media. Therefore, this research paper compares the thermal conductivity and shrinkage results of compacted (low to high densities) fly ash- and sand-bentonite mixtures with bentonite contents of 30%, 50%, 60%, 80% and 100%. The thermal conductivity of mixtures increased from 1.05 Wm<sup>−1</sup>K<sup>−1</sup> to 1.20 Wm<sup>−1</sup>K<sup>−1</sup> with the addition of fly ash content from 20 to 70% by weight in bentonite. The thermal conductivity bentonite-sand mixture was also found to be increased from 1.21 Wm<sup>−1</sup>K<sup>−1</sup> to 1.83 Wm<sup>−1</sup>K<sup>−1</sup> with increasing sand content. Additional to this, the bentonite-sand and bentonite-fly ash-based backfill materials surrounding heat-sensitive structures experience shrinkage and desiccation cracking due to thermal drying. Therefore, the desiccation volumetric shrinkage tests of bentonite-sand and bentonite-fly ash mixtures were conducted and found that the presence of sand or fly ash reduces shrinkage strain. Based on the experimental results, this study suggests a sustainable utilization of fly ash up to 50%-70% as an effective thermal backfill material in electrical cable infrastructure systems. Thus, the application of fly ash as a construction material reduces environmental impact and cost, aligning with the goals of sustainable development.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672436","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 studies on fluctuation properties of dust, turbulence and electric field during floating dust weather in Lanzhou 兰州浮尘天气中尘埃、湍流和电场波动特性的试验研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-15 DOI: 10.1007/s10035-024-01481-9

Tian-sheng Liu, Tian-Li Bo

{"title":"Experimental studies on fluctuation properties of dust, turbulence and electric field during floating dust weather in Lanzhou","authors":"Tian-sheng Liu, Tian-Li Bo","doi":"10.1007/s10035-024-01481-9","DOIUrl":"10.1007/s10035-024-01481-9","url":null,"abstract":"<div><p>In this paper, real-time measurements of three-dimensional wind speed, electric field and dust concentration during the floating-dust event were carried out in Lanzhou. The scaling relationship of different physical quantities in spectral space and the effect of turbulent events on dust and heat transport are studied by spectral method and octant analysis method. Our results show that the logarithmic value of power spectrum of dust concentration, relative humidity (<i>RH</i>), streamwise and vertical wind speed (<i>u</i> and <i>w</i>) between 0.06 Hz and 0.435 Hz meets the linear relationship with the logarithmic value of frequency (<i>f</i>), and decreases with the logarithmic value of <i>f</i>. For different stages, in the frequency range from 0.06 Hz to 0.218 Hz, the slope of the <i>u</i> first increases and then decreases. The slope of dust concentration and <i>RH</i> did not change significantly in the development stage, but decreased in the decay stage. The slope of the temperature (<i>T</i>) first decreases and then increases. In the frequency range from 0.218 Hz to 0.435 Hz, the slope of <i>u</i> and <i>RH</i> first increase and then decrease. The slope of the dust concentration does not change significantly during the development stage and decreases in the decay stage. The slope of <i>w</i> first increases and then decreases. In the second stage, the contribution of ejection and sweep events to the turbulent motion increases. For dust and heat transport, the O<sub>5</sub> and O<sub>8</sub> have a larger number contribution. Although the number and intensity contribution ratio of all octants increased or decreased in the second and third stages, in terms of the intensity of a single event, the contribution of all octants to the dust and heat transport increased.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645769","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

Prediction of liquid bridge rupture between two plates combining artificial neural network with grey wolf optimization algorithm 人工神经网络与灰狼优化算法相结合的双板间液桥断裂预测

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-11 DOI: 10.1007/s10035-024-01479-3

Zenghua Fan, Congcong Huang, Jun Gao, Kun Zhang, Zhi Xu, Ming Fan

{"title":"Prediction of liquid bridge rupture between two plates combining artificial neural network with grey wolf optimization algorithm","authors":"Zenghua Fan, Congcong Huang, Jun Gao, Kun Zhang, Zhi Xu, Ming Fan","doi":"10.1007/s10035-024-01479-3","DOIUrl":"10.1007/s10035-024-01479-3","url":null,"abstract":"<div><p>The liquid bridge rupture has attracted much attention in various fields such as powder technology, micro gripping, and wet agglomeration. In present study, an artificial neural network (ANN) model was developed to predict the liquid bridge rupture between two plates, focusing on the rupture distance and the transfer ratio. The initial weights and biases of the ANN model were optimized by the grey wolf optimization algorithm (GWO). The GWO-ANN model prediction is compared with the BP-ANN model prediction. Based on the testing dataset, the mean square error (<i>MSE</i>) and correlation coefficient (<i>R</i><sup>2</sup>) of the rupture distance for the optimized GWO-ANN model were calculated as 4.65 × 10<sup>− 4</sup> and 0.9586, and that of the transfer ratio was 2.15 × 10<sup>− 4</sup> and 0.975, respectively. The effectiveness of the constructed GWO-ANN model for the liquid bridge rupture prediction was verified by experimental investigations. The effect of input parameters including contact angles, stretching speed, liquid volume and liquid viscosity on the rupture was discussed in detail.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598869","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

Construction of granular aggregates with different porosity, shape, and size distributions 制造具有不同孔隙率、形状和粒度分布的颗粒集料

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-09 DOI: 10.1007/s10035-024-01477-5

Emmanuel N. Millán, M. Belén Planes, Eduardo M. Bringa, M. Gabriela Parisi

{"title":"Construction of granular aggregates with different porosity, shape, and size distributions","authors":"Emmanuel N. Millán, M. Belén Planes, Eduardo M. Bringa, M. Gabriela Parisi","doi":"10.1007/s10035-024-01477-5","DOIUrl":"10.1007/s10035-024-01477-5","url":null,"abstract":"<p>Granular matter is characterized by a collection of grains, where the collective behavior relies on interactions among all constituent particles, generally including both cohesive and dissipative interactions. Understanding and predicting granular behavior is pivotal for both basic science and technological applications, ranging from astrophysics to geology, cereal storage, and cosmetics development. The structure of these aggregates varies depending on the environment but often involves a highly porous configuration. In this study, we introduce our AGregate GENeration Tool (AGGENT) specifically designed for constructing granular aggregates with varying levels of porosity, shapes, and grain sizes. The software facilitates aggregate generation using JKR or DMT cohesive models with a finite grain overlap, enabling the achievement of highly homogeneous aggregates. The behavior of porosity of the generated samples near surfaces is also discussed. These generated samples can subsequently be utilized for performing various simulations, allowing for further analysis of granular behavior under different conditions of interest, including transport, mechanical and thermal properties, etc.</p>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"27 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598908","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

Macroscopic effects of intraparticle fracture, grain topology and shape on vehicle dynamics and mobility over gravel road beds 颗粒内断裂、颗粒拓扑结构和形状对车辆在砾石路面上的动力学和流动性的宏观影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-11-07 DOI: 10.1007/s10035-024-01469-5

Debdeep Bhattacharya, Robert Lipton

引用次数: 0