Granular Matter最新文献_第9页

Investigations of particle-process-part quality relationships in electron beam melting 电子束熔化过程中颗粒-过程-部件质量关系的研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-08-04 DOI: 10.1007/s10035-024-01455-x

Garrett M. Kelley, M. Ramulu

{"title":"Investigations of particle-process-part quality relationships in electron beam melting","authors":"Garrett M. Kelley, M. Ramulu","doi":"10.1007/s10035-024-01455-x","DOIUrl":"10.1007/s10035-024-01455-x","url":null,"abstract":"<div><p>Electron beam melting is a powder bed fusion process capable of manufacturing parts from a variety of high-temperature alloys. Given that the process relies on feedstock recycling for process economics, understanding process-part quality relationships is critical. This work investigates process-part quality relationships in terms of the internal and external defects and component microstructure relative to a feedstock subjected to 33 build cycles without replacement. To accomplish this, a volume of fluid mesoscale model consisting of three different powder distributions were considered: (1) Monomodal; (2) As-measured; and (3) Irregular. Particle morphology was characterized using shape factors examined via optical microscopy. To approximate the particle shapes in three-dimensions, a method is presented that utilizes a binarized domain to define low frequency, macroscale particle “base” shapes implicitly and is thus not restricted to starlike particles. The discrete element method was also used to investigate velocity distributions and packing densities of the as-measured and irregular particles with respect to deviations in the nominal layer thickness of 50 μm. In general, beam power and scan speed were found to have an appreciable effect on microstructure formation and surface roughness. Finally, correlations were found between specific classifications of irregular particles and lack of fusion defect formation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Overview of the discrete element method simulation domain for the electron beam melting powder bed fusion process</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01455-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141944447","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

Flow characteristics of caved ore and rock under the influence of multiple coarse particles: insight from interparticle interaction 多粗颗粒影响下洞穴矿石和岩石的流动特性：颗粒间相互作用的启示

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-08-03 DOI: 10.1007/s10035-024-01458-8

Hao Sun, Shenggui Zhou, Shuaijun Chen, Aibing Jin, Zesong Yin, Xiaoxiao Wang, Zongsheng Dai

引用次数: 0

Cluster-based particle tracking velocimetry algorithm combining the quasi-parallel correction in granular motions reconstruction 基于集群的粒子跟踪测速算法，结合颗粒运动重建中的准平行校正

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-08-02 DOI: 10.1007/s10035-024-01456-w

Kaiyuan Guan, Yang Zhang, Yuanwei Lin, Minghan Jiao, Bin Yang, Xiaomiao Fan

{"title":"Cluster-based particle tracking velocimetry algorithm combining the quasi-parallel correction in granular motions reconstruction","authors":"Kaiyuan Guan, Yang Zhang, Yuanwei Lin, Minghan Jiao, Bin Yang, Xiaomiao Fan","doi":"10.1007/s10035-024-01456-w","DOIUrl":"10.1007/s10035-024-01456-w","url":null,"abstract":"<div><p>Particle Tracking Velocimetry (PTV) is a Lagrange-based flow visualization technique that tracks the motion of multiple particles or granules simultaneously. With the widespread application of three-dimensional (3D) particle imaging systems, 3D PTV algorithms have attracted considerable interest, whereas many 3D algorithms are developed from the corresponding 2D algorithms; moreover, compared with 3D algorithms, 2D algorithms are more suitable for real-time flow monitoring in industry. This paper proposes a 2D PTV algorithm based on the Voronoi diagram (VD) that is optimized by the minimum enclosing ellipse (MEE); then a re-matching process based on a homemade method called Quasi-Parallel Correction (QPC) is developed to correct the abnormal results produced by PTV at large inter-frame particle displacement. This PTV is thereby named MQ-PTV. MQ-PTV is then employed for reconstructing a granular flow made of dense polypropylene particles along a declined chute, an aeolian sand flow over sand bed, the migration of a barchans swarm and the motion of stars, thus confirming its practicability in a wide variety of particle motion reconstruction.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141885612","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

An experimental and numerical study of the influence of the additive manufacturing process in packing properties of particles: the printed shape matters 增材制造工艺对颗粒堆积特性影响的实验和数值研究：印刷形状很重要

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-08-01 DOI: 10.1007/s10035-024-01447-x

Tiaan Friedrich, Yuan Tan, Heiko Briesen, Daniel Schiochet Nasato

{"title":"An experimental and numerical study of the influence of the additive manufacturing process in packing properties of particles: the printed shape matters","authors":"Tiaan Friedrich, Yuan Tan, Heiko Briesen, Daniel Schiochet Nasato","doi":"10.1007/s10035-024-01447-x","DOIUrl":"10.1007/s10035-024-01447-x","url":null,"abstract":"<div><p>Investigations into the various properties of granular matter composed of particles with defined shapes have gained increasing attention. Additive manufacturing, with its freedom of shape and rapid prototyping capabilities, has significantly contributed to these studies. However, this technique may introduce defects in the manufactured particles, which can significantly affect the properties of granular materials. The extent of these defects on particles of different shapes is investigated here. Particles of various shapes (cube, octahedron, quatropod, stellated octahedron, tetrahedron, and tetrapod) were manufactured and subsequently imaged using micro-Computed Tomography. The surface roughness, solidity, and convexity of the particles were quantified. Discrete element simulations of granular bed porosity, utilizing both idealized and real particle shapes, were conducted with different surface mesh resolutions and frictional parameters. A clear influence of the manufacturing process on the packing properties of 3D printed particles was identified. This influence is not uniform across all shapes and is directly correlated with the particle convexity. For numerical simulations, a shape-dependent correction of particle density and surface characteristics are imperative for each shape under consideration, despite the fact that the particles were manufactured using the same technique and material.</p><h3>Graphic abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01447-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869801","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

Triangle side ratio method for particle angularity characterization: from quantitative assessment to classification applications 用于颗粒角度表征的三角边比方法：从定量评估到分类应用

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-07-30 DOI: 10.1007/s10035-024-01449-9

Huayu Qi, Wei Liu, Xiuwen Yin, Hongyan Jia, Fan Yan, Yajing Wang

{"title":"Triangle side ratio method for particle angularity characterization: from quantitative assessment to classification applications","authors":"Huayu Qi, Wei Liu, Xiuwen Yin, Hongyan Jia, Fan Yan, Yajing Wang","doi":"10.1007/s10035-024-01449-9","DOIUrl":"10.1007/s10035-024-01449-9","url":null,"abstract":"<div><p>Existing image analysis algorithms cannot achieve consistency with human visual classification results when classifying particles based on angular levels. To address this issue, this paper proposes an image analysis method based on triangle side ratio to quantify particle angularity, referred to as a TSR method. The proposed method utilizes a primary parameter, Mean Angularity, to assess the mean angularity level, and employs three auxiliary parameters to offer insights into the Sharpest Angularity, the Flat Proportion, and the Number of Angularity. When quantifying the angularity, the method further provides the count of convex angles. Each parameter can reflect different characteristic information of the angularity. When using the mean angularity level to order particles, the TSR method achieves the same results as visual classification, and furthermore introduces a range of values for the main parameter corresponding to the different angularity levels. The TSR method is simpler and more stable, since the particle parameters can be calculated directly without contour smoothing, and consistent results are achieved for different shapes with the same degree of angular sharpness. The results of the study on lunar soil, volcanic rock, mechanism stone, and stream stone, show that the TSR method can objectively and comprehensively analyze and quantify the particle angularity.</p><h3>Graphic abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869802","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 velocity similarity graph for velocity field analysis in granular intruder motion 构建用于粒状入侵者运动速度场分析的速度相似图

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-07-28 DOI: 10.1007/s10035-024-01451-1

Robertas Navakas, Algis Džiugys, Edgaras Misiulis, Gediminas Skarbalius

引用次数: 0

Competition analysis of grain flow versus clogging by means of information theory 利用信息论分析谷物流动与堵塞的竞争关系

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-07-24 DOI: 10.1007/s10035-024-01448-w

R. Caitano, A. J. Ramirez-Pastor, E. E. Vogel, G. Saravia

{"title":"Competition analysis of grain flow versus clogging by means of information theory","authors":"R. Caitano, A. J. Ramirez-Pastor, E. E. Vogel, G. Saravia","doi":"10.1007/s10035-024-01448-w","DOIUrl":"10.1007/s10035-024-01448-w","url":null,"abstract":"<p>The different flow regimes in a two-dimensional silo with a vibrated base are studied in terms of the usual statistical techniques and information theory. The passage of granular material through the mouth of the silo is analyzed by real-time analysis of images captured by a standard video camera. The brightness of these images is measured and recorded at very small time intervals (100 frames per second). The experiment is repeated for different values of the vibration intensity. Data recognizer wlzip directly treats the resulting <i>b</i>(<i>t</i>) files (brightness time series) based on data compressor techniques, yielding the information content measured by the mutability <span>(mu)</span> function.<span>(mu)</span> has not previously been considered as part of the conventional treatment of flow in granular media. The results obtained here clearly demonstrate the usefulness of mutability as a tool for distinguishing between different flowing regimes directly from the brightness sequence, with no manipulation of the series. This shows that information theory techniques can provide a complementary description of the discharge of granular materials and its control through data compression algorithms.</p>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141775412","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

Clogging reduction by addition of small particles of various material densities 通过添加不同密度的小颗粒减少堵塞

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-07-10 DOI: 10.1007/s10035-024-01444-0

Sandip H. Gharat, Julián Montero, Luis A. Pugnaloni

{"title":"Clogging reduction by addition of small particles of various material densities","authors":"Sandip H. Gharat, Julián Montero, Luis A. Pugnaloni","doi":"10.1007/s10035-024-01444-0","DOIUrl":"10.1007/s10035-024-01444-0","url":null,"abstract":"<div><p>We present an experimental investigation on the flow and clogging of bi-disperse mixtures of coarse and fine grains of different densities passing through small orifices. We vary the density ratio (coarse/fine) from 1.87 down to 0.79 by using amaranth seeds, glass and ceramic beads of similar size as the fine species in combination with 2.0 mm glass beads as the coarse grains. We analyzed the effect of the density ratio on the effective flow rate of the coarse species, the segregation during flow and the clogging for a range of orifice diameters. As in previous studies, the flow of the coarse grains is facilitated by the fine species, which prevents clogging. We show that the effective flow rate of the coarse species is virtually independent of the density ratio. These results suggest that in practical applications with the goal of clogging reduction, the density of the fine species used to ease the flow is not a relevant parameter and can be selected based on practical or economic constraints.</p><h3>Graphic abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div><div><p>Schematic diagram of the flow of large grains through a small orifice when they are diluted in a mixture with fine grains</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587610","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 hydrodynamic characteristics of a 3D liquid-solid tapered fluidized bed using kinetic theory of rough spheres 利用粗糙球体动力学理论预测三维液固锥形流化床的流体力学特性

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-07-06 DOI: 10.1007/s10035-024-01445-z

Ruichao Tian, Jianlin Xie, Shuyan Wang, Yueming Guo, Xiaoxue Jiang, Konghang Yang, Chaoxu Shen

{"title":"Prediction of hydrodynamic characteristics of a 3D liquid-solid tapered fluidized bed using kinetic theory of rough spheres","authors":"Ruichao Tian, Jianlin Xie, Shuyan Wang, Yueming Guo, Xiaoxue Jiang, Konghang Yang, Chaoxu Shen","doi":"10.1007/s10035-024-01445-z","DOIUrl":"10.1007/s10035-024-01445-z","url":null,"abstract":"<div><p>The fluidized bed bioreactor is an economical and efficient method for wastewater treatment. In the fluidized bed bioreactor, fluidized particles carrying microorganisms consume the organic pollutants in wastewater. The collision and friction between carrier particles in the fluidized bed can affect the efficiency of wastewater treatment. Therefore, understanding the hydrodynamics of fluidized bed bioreactors is crucial. In this study, the particle collision velocity depending on particle volume fraction and granular temperature, as well as considering the influence of particle surface roughness and elasticity through the critical Stokes number, a dynamic restitution coefficient model for wet rough particles is developed to provide a more accurate description of the collision behavior between wet rough particles. The model is incorporated into the kinetic theory of rough spheres to perform numerical simulations on the hydrodynamic characteristics of a three-dimensional liquid-solid tapered fluidized bed using the two-fluid model. The simulation results exhibit better agreement with experimental data by Wu et al. compared to prior studies. Furthermore, sensitivity analyses are conducted on drag force, virtual mass force, and lift force. It is observed that the Koch-Hill drag model predicts the bed expansion heights closest to the measured results. Additionally, the impacts of static bed height and particle density on the fluidized bed hydrodynamics are investigated. Simulation results indicate that an increase in static bed height initially leads to an increase and then a decrease in particle collision velocity. Within the current study scope, particle collision velocity exhibits a monotonic increase with increasing particle density.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568609","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

Configurational mechanics in granular media 颗粒介质中的构型力学

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-06-27 DOI: 10.1007/s10035-024-01443-1

Francois Nicot, Mingchun Lin, Antoine Wautier, Richard Wan, Félix Darve

{"title":"Configurational mechanics in granular media","authors":"Francois Nicot, Mingchun Lin, Antoine Wautier, Richard Wan, Félix Darve","doi":"10.1007/s10035-024-01443-1","DOIUrl":"10.1007/s10035-024-01443-1","url":null,"abstract":"<div><p>Granular materials belong to the class of complex materials within which rich properties can emerge on large scales despite a simple physics operating on the microscopic scale. Most notable is the dissipative behaviour of such materials mainly through non-linear frictional interactions between the grains which go out of equilibrium. A whole variety of intriguing features thus emerges in the form of bifurcation modes in either patterning or un-jamming. This complexity of granular materials is mainly due to the geometrical disorder that exists in the granular structure. Diverse configurations of grain collections confer to the assembly the capacity to deform and adapt itself against different loading conditions. Whereas the incidence of frictional properties in the macroscopic plastic behavior has been well described for long, the role of topological reorganizations that occur remains much more elusive. This paper attempts to shed a new light on this issue by developing ideas following the configurational entropy concept within a proper statistical framework. As such, it is shown that contact opening and closing mechanisms can give rise to a so-called configurational dissipation which can explain the irreversible topological evolutions that granular materials undergo in the absence of frictional interactions.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507849","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