Granular Matter最新文献_第10页

A viscoelastic bonded particle model to predict rheology and mechanical properties of hydrogel spheres 预测水凝胶球流变性和机械性能的粘弹性粘合颗粒模型

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-05-04 DOI: 10.1007/s10035-024-01429-z

Michael Mascara, Chandan Shakya, Stefan Radl, Arno Mayrhofer, Christoph Kloss

{"title":"A viscoelastic bonded particle model to predict rheology and mechanical properties of hydrogel spheres","authors":"Michael Mascara, Chandan Shakya, Stefan Radl, Arno Mayrhofer, Christoph Kloss","doi":"10.1007/s10035-024-01429-z","DOIUrl":"10.1007/s10035-024-01429-z","url":null,"abstract":"<p>The use of hydrogels has exponentially increased in recent years in many fields, such as biology, medicine, pharmaceuticals, agriculture, and more. These materials are so widely used because their mechanical properties change drastically with the different chemical compositions of the constituent polymer chains, making them highly versatile for different applications. We introduce a numerical simulation tool that relies on the Discrete Element Method to reproduce and predict the behavior of hydrogel spheres. We first use a benchmark test, namely an oscillatory compression test on a single hydrogel, to calibrate the model parameters, obtaining a good agreement on the material’s rheological properties. Specifically, we show that the normal modified storage and loss moduli, E’ and E”, obtained in the simulation match the experimental data with a small relative error, around 3%, for E’ and 11% for E”. This result aligns with recent work on numerical modeling of hydrogels, introducing a novel approach with bonded particles and a viscoelastic constitutive relation that can capture a wide range of applications thanks to the higher number of elements. Moreover, we validate the model on a particle-particle compression test by comparing the simulation output with the contact force in the compression direction, again obtaining promising results.</p>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140889145","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 basal friction on granular column collapse 基底摩擦对颗粒柱坍塌的影响

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-05-02 DOI: 10.1007/s10035-024-01436-0

Yucheng Li, Deheng Wei, Ningning Zhang, Raul Fuentes

{"title":"Effect of basal friction on granular column collapse","authors":"Yucheng Li, Deheng Wei, Ningning Zhang, Raul Fuentes","doi":"10.1007/s10035-024-01436-0","DOIUrl":"10.1007/s10035-024-01436-0","url":null,"abstract":"<div><p>The collapse behaviour of granular materials is influenced by many factors, such as aspect ratio and inter-particle friction. However, the specific impact of basal to grain friction on column collapse remains poorly understood. In this study, we systematically analyse the effect of basal friction on gravity-driven granular column collapse using a validated smoothed particle hydrodynamics (SPH) model. The results show that such the basal friction coefficient does influence deposit geometry, deposit morphology, and energy conversion. To predict the run-out distance, we propose a modified formula that incorporates the basal friction coefficient, considering two extreme cases, i.e., <i>μ</i> = 0 and + ∞. The basal friction also exerts an influence on the final height, with higher friction coefficients resulting in greater final heights. As the friction coefficient increases, the aspect ratio corresponding to the maximum final height also increase. However, we observe a convergence of the effect of basal friction on the final height when <i>μ</i> > 0.5. Furthermore, the competition mechanism between the initial column aspect ratio and basal friction coefficient reveals two transition zones between the three main deposit regimes (regime I, regime II, and regime III). This suggests that the deposit regime can be influenced by basal friction. Additionally, an analysis of energy conversion supports many of the conclusions provided in the text and exhibits the interplay between pressure gradient and base friction. Our findings show the clear influence of basal friction on the collapse behaviour of granular materials and therefore should be carefully considered in future studies.</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":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140828570","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

Study on modified pre-disintegrated carbonaceous mudstone triaxial test and binary medium model 改良预解体碳质泥岩三轴试验和二元介质模型研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-29 DOI: 10.1007/s10035-024-01435-1

Hong-yuan Fu, Hai-tao Yang, Hao Wu, Ling Zeng, Er-lu Wu, Yan Wang

{"title":"Study on modified pre-disintegrated carbonaceous mudstone triaxial test and binary medium model","authors":"Hong-yuan Fu, Hai-tao Yang, Hao Wu, Ling Zeng, Er-lu Wu, Yan Wang","doi":"10.1007/s10035-024-01435-1","DOIUrl":"10.1007/s10035-024-01435-1","url":null,"abstract":"<div><p>In order to eliminate the undesirable characteristics of carbonaceous mudstone roadbed fillers, cement and fly ash are used to modify the pre-disintegrated carbonaceous mudstone, and the stress–strain relationship of pre-disintegrated carbonaceous mudstone before and after modification are analyzed by a series of conventional unconsolidated undrained triaxial compression tests at different confining pressures and different ages. Based on the microscopic modification mechanism of carbonaceous mudstone and the concept of binary medium model, the products from hydration reaction of pre-disintegrated carbonaceous mudstone, cement, and fly ash are regarded as bonded elements, and the pre-disintegrated carbonaceous mudstones without hydration reaction are regarded as frictional elements, and the binary medium model of modified pre-disintegrated carbonaceous mudstone is established. The results show that the stress–strain curve of pre-disintegrated carbonaceous mudstone is strain-hardening type, and the stress–strain of pre-disintegrated carbonaceous mudstone modified by fly ash and cement is strain-softening type, and the mechanical properties of modified pre-disintegrated carbonaceous mudstone are significantly improved. The deformation and damage mechanism of modified carbonaceous mudstone is investigated by applying the concept of binary medium model from a mesoscopic perspective, and the stress-bearing mechanism of bonded elements and frictional elements in external loading and stressing processes are analyzed. Finally, the measured data reveals that the binary medium model can simulate both the stress–strain softening characteristics of modified pre-disintegrated carbonaceous mudstone and the stress–strain hardening characteristics of organic material-modified expansive soils reasonably well.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140810532","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 network-based investigation on static liquefaction of sheared granular materials 基于网络的剪切颗粒材料静态液化研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-27 DOI: 10.1007/s10035-024-01433-3

Wanda Cao, Jiangzhou Mei, Xiaojuan Yang, Wei Zhou, Xiaolin Chang, Gang Ma

{"title":"A network-based investigation on static liquefaction of sheared granular materials","authors":"Wanda Cao, Jiangzhou Mei, Xiaojuan Yang, Wei Zhou, Xiaolin Chang, Gang Ma","doi":"10.1007/s10035-024-01433-3","DOIUrl":"10.1007/s10035-024-01433-3","url":null,"abstract":"<div><p>Granular materials may undergo static liquefaction under undrained shearing, which is related to many natural hazards, such as landslides. Despite great efforts, the overall process of static liquefaction remains largely unclear. Numerical undrained shear tests on granular assemblies are performed using the discrete element method, and network-based methods are introduced to investigate the evolution of the contact network. The occurrence of static liquefaction is attributed to the collapse of the contact network induced by contact loss. The weak subnetwork is broken before reaching the liquefaction point, while the strong contact subnetwork remains relatively unchanged. The failure of the strong subnetwork is further investigated by the mechanical features of two important mesoscopic structures, namely force chains and contact loops. The buckling events with buckling ratio exceeding the envelope line and the transition from small loops to large loops significantly destroy the stability of force chains, which causes the failure of force chains and eventually the occurrence of static liquefaction. The relationship of macroscopic stress with microscopic and mesoscopic structures is also identified. The evolution of node degree and global efficiency versus macroscopic stress presents a two-stage development mode, and the buckling events accelerates the transition of the development mode. Our analysis elucidates the occurrence of static liquefaction from microscopic and macroscopic perspectives, which are essential for better prediction and modeling of the catastrophic failures under undrained loading path of granular materials.</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":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140810741","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

Structural properties of different sphere packings with arbitrary porosities for planetary-science applications 行星科学应用中具有任意孔隙率的不同球形填料的结构特性

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-23 DOI: 10.1007/s10035-024-01418-2

L. Klar, T. Glißmann, K. Lammers, C. Güttler, J. Blum

{"title":"Structural properties of different sphere packings with arbitrary porosities for planetary-science applications","authors":"L. Klar, T. Glißmann, K. Lammers, C. Güttler, J. Blum","doi":"10.1007/s10035-024-01418-2","DOIUrl":"10.1007/s10035-024-01418-2","url":null,"abstract":"<p>Granular solids in planetary science are found in the regolith that covers planetary surfaces as well as in the bulk of rubble-pile asteroids, comets and planetesimals. To help understand the physics of these planetary bodies, we aim at deriving the structural properties of granular packings over a large range of porosities. Relevant to fluid flow and gas diffusion are the void spaces inside the granular packings so that we analyze the mean free path of point-like particles, their diffusion constant and their total traveled path lengths. For mechanical and heat-transport properties, the coordination number and the absolute chain length of the inter-connected particles are important. Generally, we also derive the homogeneity and isotropy of the granular solids. We compare granular packings generated by four algorithms for porosities in the range between 85 and 42%, which are the upper and lower limits for natural packings of equal-sized spheres. All produced sphere packings arrive at very similar quantities for the mean free path, the free path probability distribution function, the diffusion constant and the total traveled path length for the entire range of porosities. Hence, transport processes governed by the void-space properties are independent of the specific generation algorithm for the granular packing. In contrast, heat conduction or mechanical stresses almost exclusively depend on the existence and properties of particle contacts and particle chains in the network of spheres. In this case, the four algorithms deliver very different results.</p>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01418-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140636944","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

Numerical investigation of crack propagation regimes in snow fracture experiments 雪地断裂实验中裂纹扩展机制的数值研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-22 DOI: 10.1007/s10035-024-01423-5

Grégoire Bobillier, Bastian Bergfeld, Jürg Dual, Johan Gaume, Alec van Herwijnen, Jürg Schweizer

{"title":"Numerical investigation of crack propagation regimes in snow fracture experiments","authors":"Grégoire Bobillier, Bastian Bergfeld, Jürg Dual, Johan Gaume, Alec van Herwijnen, Jürg Schweizer","doi":"10.1007/s10035-024-01423-5","DOIUrl":"10.1007/s10035-024-01423-5","url":null,"abstract":"<div><p>A snow slab avalanche releases after failure initiation and crack propagation in a highly porous weak snow layer buried below a cohesive slab. While our knowledge of crack propagation during avalanche formation has greatly improved over the last decades, it still remains unclear how snow mechanical properties affect the dynamics of crack propagation. This is partly due to a lack of non-invasive measurement methods to investigate the micro-mechanical aspects of the process. Using a DEM model, we therefore analyzed the influence of snow cover properties on the dynamics of crack propagation in weak snowpack layers. By focusing on the steady-state crack speed, our results showed two distinct fracture process regimes that depend on slope angle, leading to very different crack propagation speeds. For long experiments on level terrain, weak layer fracture is mainly driven by compressive stresses. Steady-state crack speed mainly depends on slab and weak layer elastic moduli as well as weak layer strength. We suggest a semi-empirical model to predict crack speed, which can be up to 0.6 times the slab shear wave speed. For long experiments on steep slopes, a supershear regime appeared, where the crack propagation speed reached approximately 1.6 times the slab shear wave speed. A detailed micro-mechanical analysis of stresses revealed a fracture principally driven by shear. Overall, our findings provide new insight into the micro-mechanics of dynamic crack propagation in snow, and how these are linked to snow cover properties.</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":"2024-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10035-024-01423-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140636945","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

Cyclic-loading effects in sand: a micromechanical study considering particle breakage 砂中的循环加载效应：考虑颗粒破碎的微机械研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-19 DOI: 10.1007/s10035-024-01421-7

Jacinto Ulloa, Ziran Zhou, John Harmon, José E. Andrade

{"title":"Cyclic-loading effects in sand: a micromechanical study considering particle breakage","authors":"Jacinto Ulloa, Ziran Zhou, John Harmon, José E. Andrade","doi":"10.1007/s10035-024-01421-7","DOIUrl":"10.1007/s10035-024-01421-7","url":null,"abstract":"<div><p>This paper investigates the response of Ottawa sand to cyclic loading using virtual oedometer tests and the level-set discrete element method. We study both the macroscopic and the micromechanical behavior, shedding light on the grain-scale processes behind the cyclic response observed in crushable sand, namely stress relaxation under strain control and ratcheting under stress control. Tests without particle breakage first show that asymmetrical frictional sliding during loading-unloading induces these cyclic-loading effects. Then, tests considering particle breakage reveal more pronounced stress relaxation and ratcheting, which decrease in rate over cycles, accompanied by increased frictional sliding and reduced particle contact forces. It is found that the broken fragments unload the most and promote an enhanced cushioning effect. These micromechanical processes contribute to a decrease in breakage potential as the cycles progress, implying that cyclically loaded materials may become more resistant to breakage when compared to the same material loaded monotonically at the same strain level. These new insights highlight the main contributions of the present work, factoring in real particle shapes from 3D X-ray tomography and notably contributing to the existing literature on the topic, where most studies rely on idealized particle shapes and rarely consider crushable grains.</p></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140630468","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

3D DEM investigation on percolation of lubricant particles during uniaxial metal powder compaction 单轴金属粉末压制过程中润滑剂颗粒渗流的三维 DEM 研究

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-18 DOI: 10.1007/s10035-024-01430-6

Wei Zhang, Weijian Xiao, Chuanniu Yuan, Xu Gong, Bozhan Hai, Rongxin Chen, Kun Liu

引用次数: 0

DEM model acquisition of the corn ear with bonded particle model and its simulated parameters calibration 利用粘结颗粒模型获取玉米果穗的 DEM 模型及其模拟参数校准

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-12 DOI: 10.1007/s10035-024-01427-1

Dandan Han, Yang Zhou, Junshan Nie, Qiqiang Li, Lin Chen, Qi Chen, Lihua Zhang

{"title":"DEM model acquisition of the corn ear with bonded particle model and its simulated parameters calibration","authors":"Dandan Han, Yang Zhou, Junshan Nie, Qiqiang Li, Lin Chen, Qi Chen, Lihua Zhang","doi":"10.1007/s10035-024-01427-1","DOIUrl":"10.1007/s10035-024-01427-1","url":null,"abstract":"<div><p>The corn variety “Zhenghong 507”, which is widely cultivated in hilly and mountainous areas of Southwest China, was assigned as the research object. The discrete element model of the mid-section of the corn ear that can be threshed was established by integrating the Hertz-Mindlin with the bonding V2 contact model, and the crucial bonding parameters were simulated and calibrated. With the measured normal threshing force (6.34 N) and tangential threshing force (4.75 N) of a single kernel as target values, the parameters of bonding characteristics between the kernel and the cob of corn ear were screened and optimized for significance via the Placket-Burman test, steepest ascent test, and the central composite design. The results indicate that the optimal parameter combinations for the normal stiffness and shear stiffness per unit area, normal strength, shear strength, contact radius between kernels, contact radius between cobs, and bonded disk scale were 3.4 × 10<sup>8</sup> N·m<sup>−3</sup>, 2.238 × 10<sup>8</sup> N·m<sup>−3</sup>, 0.6 × 10<sup>6</sup> Pa, 0.364 × 10<sup>6</sup> Pa, 1.87 mm, 16.5 mm and 1.321. Finally, the accuracy of the corn ear DEM model was validated by comparing the simulation to the physical test using the threshing rate as an evaluation index combined with the quality distribution of kernels after threshing.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div><div><p>Calibration and validation of a corn ear bonded model.</p></div></div></figure></div></div>","PeriodicalId":49323,"journal":{"name":"Granular Matter","volume":"26 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140599681","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

Particle breakage of ultra-high dam rockfills under drained shearing 排水剪切作用下超高坝填石的颗粒破碎

IF 2.4 3区工程技术

Granular Matter Pub Date : 2024-04-12 DOI: 10.1007/s10035-024-01428-0

Wei Jin, Xing Yang, Feng-chun Yang, Jin-quan Shi

引用次数: 0