2024-03-28T15:57:20Z
https://zenodo.org/oai2d
oai:zenodo.org:4066761
2022-06-03T12:31:00Z
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Wang, Jing
Harth, Kirsten
Börzsönyi, Tamás
Stannarius, Ralf
2020-10-05
<p>The repository of videos show the flowing process of hydrogel particles (diameter 6.5mm) in a silo with different size of orifice, 10mm,11mm,12mm,15mm,18mm. To compare intermittent flow behavior of HGS with hard spheres (ASB), the videos for ASB(diameter 6mm) are also in the dataset with different size of orifice, 34mm and 35mm. The spatial resolution of videos in files is 1920 × 1080 (0.327mm per pixel) correpondingly the real size of the silo showed in the video is 40cm width and 50cm height in the snapshot. The frame rate in each video is 60fps. The recording is for the study of intermittent flow and transient congestion of soft spheres passing through narrow orifices (https://doi.org/10.5281/zenodo.4066466)</p>
https://doi.org/10.5281/zenodo.4066761
oai:zenodo.org:4066761
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https://hdl.handle.net/10.1039/D0SM00938E
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https://doi.org/10.5281/zenodo.4066760
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granular dynamics, soft matter, silo discharge, clogging
overview of intermittent flow of hydrogel particles
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oai:zenodo.org:4066466
2022-06-03T12:29:46Z
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Kirsten Harth
Jing Wang
Tamás Börzsönyi
Ralf Stannarius
2020-08-06
<p>Soft, low-friction particles in silos show peculiar features during their discharge. The outflow velocity and the clogging probability both depend upon the momentary silo fill height, in sharp contrast to silos filled with hard particles. The reason is the fill-height dependence of the pressure at the orifice. We study the statistics of silo discharge of soft hydrogel spheres. The outflow is found to become increasingly fluctuating and even intermittent with decreasing orifice size, and with decreasing fill height. In orifices narrower than two particle diameters, outflow can stop completely, but in contrast to clogs formed by rigid particles, these congestions may dissolve spontaneously. We analyze such non-permanent congestions and attribute them to slow reorganization processes in the container, caused by viscoelasticity of the material.</p>
https://doi.org/10.5281/zenodo.4066466
oai:zenodo.org:4066466
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https://doi.org/10.1039/D0SM00938E
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https://doi.org/10.5281/zenodo.4066465
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granular dynamics, soft matter, silo discharge, clogging
Intermittent flow and transient congestions of soft spheres passing narrow orifices
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oai:zenodo.org:10517970
2024-01-16T10:37:35Z
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Borzsonyi, Tamas
Pinzon, Gustavo
Hanif, Muhammad Ahmed
Trittel, Torsten
Stannarius, Ralf
Klopp, Christoph
2024-01-16
<p>Granular materials are discrete particulate media that can flow like a liquid but also be rigid like a solid. This complex mechanical behavior originates in part from the particles shape. How particle shape affects mechanical behavior remains poorly understood. Understanding this micro-macro link would enable the rational design of potentially cheap, light weight or robust materials. To aid this development, we have produced a set of standard particle shapes that can be used as benchmarks for granular materials research. Here we describe the collection of benchmark shapes. Some part of the particles are modeled on superquadrics, others are custom designed. The particles used so far were made from polyoxymethylene (POM) and Thermoplastic elastomers (TPE) whose specifications are also listed. The benchmark shapes are available as molds in a plastics manufacturing company, whose contact information is also included. The company is capable of making other molds as well, giving access to more particle shapes. The same particle shapes can thus also be made in different types of (colored) plastic, and in amounts of 50.000 particles or more, larger than conveniently be produced with a 3D printer. We also provide the associated .step and .stl files in the repository in which this document is included. </p>
https://doi.org/10.5281/zenodo.10517970
oai:zenodo.org:10517970
eng
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https://doi.org/10.5281/zenodo.7147021
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Particles
Macaroni
Ellipsoid
Tetrapod
Hexapod
Sphereotetrahedron
Caliper
CaliParticles: A Benchmark Standard for Experiments in Granular Materials
info:eu-repo/semantics/other
oai:zenodo.org:7147022
2022-10-17T14:26:25Z
openaire_data
user-eu
user-caliper
Borzsonyi, Tamas
Pinzon, Gustavo
Hanif, Muhammad Ahmed
Trittel, Torsten
Stannarius, Ralf
Klopp, Christoph
2022-10-17
<p>Granular materials are discrete particulate media that can flow like a liquid but also be rigid like a solid. This complex mechanical behavior originates in part from the particles shape. How particle shape affects mechanical behavior remains poorly understood. Understanding this micro-macro link would enable the rational design of potentially cheap, light weight or robust materials. To aid this development, we have produced a set of standard particle shapes that can be used as benchmarks for granular materials research. Here we describe the collection of benchmark shapes. Some part of the particles are modeled on superquadrics, others are custom designed. The particles used so far were made from polyoxymethylene (POM) whose specifications are also listed. The benchmark shapes are available as molds in a plastics manufacturing company, whose contact information is also included. The company is capable of making other molds as well, giving access to more particle shapes. The same particle shapes can thus also be made in different types of (colored) plastic, and in amounts of 50.000 particles or more, larger than conveniently be produced with a 3D printer. We also provide the associated .step and .stl files in the repository in which this document is included. </p>
https://doi.org/10.5281/zenodo.7147022
oai:zenodo.org:7147022
eng
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https://doi.org/10.5281/zenodo.7147021
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Particles
Macaroni
Ellipsoid
Tetrapod
Hexapod
Sphereotetrahedron
Caliper
CaliParticles: A Benchmark Standard for Experiments in Granular Materials
info:eu-repo/semantics/other
oai:zenodo.org:10729929
2024-03-01T06:05:58Z
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Farmani, Zohreh
Dijksman, Joshua A.
Stannarius, Ralf
Wang, Jing
2023-07-31
<p>Slowly sheared particulate media like sand and suspensions flow heterogeneously as they yield via narrow shear bands where most of the strain is accumulated. Understanding shear band localization from microscopics is still a major challenge. One class of so-called non-local theories identified that the width of the shearing zone should depend on the stress field. We explicitly test this picture by using a uniquely stress-sensitive suspension while probing its flow behavior in a classic geometry in which shear bands can be well-tuned: the Split-Bottom Shear Cell (SBSC). The stress-sensitive suspension is composed of mildly polydisperse soft, slippery hydrogel spheres submersed in water. We measure their flow profiles and rheology while controlling the confinement stress via hydrostatic effects and compression. We determine the average angular velocity profiles in the quasi-static flow regime using Magnetic Resonance Imaging based particle image velocimetry (MRI-PIV) and discrete element method (DEM) simulations. We explicitly match a pressure-sensitive non-local granular fluidity (NGF) model to observed flow behavior. We find that shear bands for this type of suspension become extremely broad under the low confining stresses from the almost density-matched fluid particle mixture, while collapsing to a narrow shear zone under finite, externally imposed compression levels. The DEM and NGF results match the observations quantitatively, confirming the conjectured pressure sensitivity for suspensions and its role in NGF. Our results indicate that pressure sensitivity should be part of non-local flow rules to describe slow flows of granular media.</p>
https://doi.org/10.48550/arXiv.2308.00140
oai:zenodo.org:10729929
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https://doi.org/10.48550/arXiv.2308.00140
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arXiv:2308.00140 [cond-mat.soft], (2023-07-31)
MRI data set for "Pressure sensitivity in non-local flow behaviour of dense hydrogel particle suspensions"
info:eu-repo/semantics/other
oai:zenodo.org:10729476
2024-02-29T22:38:51Z
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user-caliper
Farmani, Zohreh
Dijksman, Joshua A.
Stannarius, Ralf
Wang, Jing
2022-09-03
<p>We introduce a new Magnetic Resonance Imaging technique to study the geometry of shear zones of soft, low-frictional and hard, frictional granular materials and their mixtures. Hydrogel spheres serve as the soft, low-frictional material component, while mustard seeds represent rigid, frictional grains. Some of the hydrogel spheres are doped with CuSO4 salt to serve as tracers. A cylindrical split-bottom cell is sheared stepwise and the shear profiles are determined from the differences of tomograms after successive shear steps, using Particle Imaging Velocimetry and Particle Tracking Velocimetry. We find that the shear zone geometry differs considerably between soft grains submersed in water and the same material without the embedding fluid.</p>
https://doi.org/10.1007/s10035-022-01271-1
oai:zenodo.org:10729476
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https://doi.org/10.1007/s10035-022-01271-1
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Granular Matter, 24, (2022-09-03)
MRI data set for "Characterization of shear zones in soft granular beds by means of a novel magnetic resonance imaging technique"
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oai:zenodo.org:7032190
2022-10-05T14:26:20Z
openaire_data
user-eu
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Kool, Lars
Lindner, Anke
2022-08-29
<p>This repository contains 5 datasets of cyclically compressed hydrogel packings inside microfluidic channels, with different oscillation frequencies, observed using a microscope. This repository contains the raw data (images) as well as analyzed data of the particles tracked over time. The data format closely resembles information you might obtain from 2D DEM simulations, and could, therefore, be used to calibrate DEM simulations of the compaction of soft particles.</p>
<p>The "Readme.md" file contains more in-depth information about the experimental setup, experiments and data structure.</p>
https://doi.org/10.5281/zenodo.7032190
oai:zenodo.org:7032190
eng
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https://doi.org/10.5281/zenodo.7032189
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Dense suspension
Suspension
Granular
Soft particles
Compression
Compaction
Oscillation
Oscillatory compression with different frequencies of 2D, dense, soft particle suspensions
info:eu-repo/semantics/other
oai:zenodo.org:6483307
2022-04-28T14:07:45Z
user-eu
user-caliper
Bo Fan
Tamás Börzsönyi
Ralf Stannarius
2022-04-25
<p>This repository holds the tomographic data of slow granular flows of irregular grains in shear cell and in silo. We tested the 3D flow properties of realistic (non-spherical) granular materials with special emphasis on the orientational ordering of the grains and its effect on the flowability of the sample. In this collaborative work between the Wigner Research Centre (Budapest) and Otto-von Guericke University (Magdeburg), laboratory experiments have been performed in two geometrical configurations: (I) quasi-static shear flow in a split bottom Couette shear device and (II) slow flow in a silo.<br>
<br>
The read_me.txt contains the structure of the data. Additional information/data not included in this repository is available upon request.</p>
https://doi.org/10.5281/zenodo.6483307
oai:zenodo.org:6483307
eng
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https://doi.org/10.5281/zenodo.6483306
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granular flows
irregular particles
tomography
Flow properties of slow granular flows of irregular grains
info:eu-repo/semantics/other
oai:zenodo.org:7813697
2024-01-11T14:17:20Z
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user-eu
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Pinzón, Gustavo
Andò, Edward
Tengattini, Alessandro
Viggiani, Gioacchino
Desrues, Jacques
2023-04-10
<p>This repository contains the technical drawings of the triaxial compression setup developed and used in the PhD thesis "<em>E<a href="https://hal.science/tel-04202827v1">xperimental investigation of the effects of particle shape and friction on the mechanics of granular media</a></em>" by Gustavo Pinzón (Université Grenoble Alpes).</p>
<p>The setup is a modification of the traditional setup used in geotechnical testing, presenting a sliding base on one of the ends, which allows the creation of a singular strain localisation region. The experimental setup is designed for i<em>n-situ</em> testing inside the x-ray tomography cabin of Laboratoire 3SR, Grenoble, France.</p>
<p> The <em>Readme.md</em> file contains further details on the structure of the repository and the materials of each component. Please refer to the PhD thesis <a href="https://hal.science/tel-04202827v1">here</a> for further details not found in the <em>Readme.md </em>file. Additional information/data not included in this repository is available upon request.</p>
https://doi.org/10.5281/zenodo.7813697
oai:zenodo.org:7813697
eng
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https://doi.org/10.5281/zenodo.7813696
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Design of a triaxial compression cell for x-ray tomography
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oai:zenodo.org:4746339
2021-05-11T01:48:09Z
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Zhao, Chao-Fa
Pinzón, Gustavo
Wiebicke, Max
Andò, Edward
Kruyt, Niels
Viggiani, Gioacchino
2021-05-10
<p>Fabric anisotropy is a key component to understand the behaviour of granular soils. In general,<br>
experimental data on fabric anisotropy for real granular soils are very limited, especially in the critical<br>
state. In this paper, x-ray tomography measurements are used to provide experimental data on contact<br>
fabric anisotropy inside shear bands for two granular soils. The data are then used to assess the validity of<br>
Anisotropic Critical State Theory (ACST) and the accuracy of a fabric evolution law that was previously<br>
developed from the results of DEM simulations on idealised materials.<br>
Overall, the experimental results support ACST according to which unique (i.e., independent of initial<br>
conditions) values for fabric anisotropy and coordination number are observed at large strains. With<br>
increasing roundness of the material, the rate at which the critical state is approached increases. The<br>
evolution of fa</p>
https://doi.org/10.1016/j.compgeo.2021.104046
oai:zenodo.org:4746339
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Granular soils, fabric anisotropy, shear band, x-ray tomography, Anisotropic Critical State Theory
Evolution of fabric anisotropy of granular soils: x-ray tomography measurements and theoretical modelling
info:eu-repo/semantics/article
oai:zenodo.org:3866025
2020-05-30T22:18:22Z
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Barés, Jonathan
Brodu, Nicolas
Zheng, Hu
Dijksman, Joshua A.
2019-12-26
<p>We describe here experiments on the mechanics of hydrogel particle packings from the Behringer lab, performed between<br>
2012 and 2015. These experiments quantify the evolution of all contact forces inside soft particle packings exposed to compression,<br>
shear, and the intrusion of a large intruder. The experimental set-ups and processes are presented and the data are<br>
concomitantly published in a repository (Barés et al. in Dryad, Dataset https://doi.org/10.5061/dryad.6djh9w0x8, 2019).</p>
https://doi.org/10.1007/s10035-019-0985-4
oai:zenodo.org:3866025
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Hydrogel particles
3D packing
Force networks
Image analysis
Calibration
Transparent experiments: releasing data from mechanical tests on three dimensional hydrogel sphere packings
info:eu-repo/semantics/article
oai:zenodo.org:10453601
2024-01-03T09:03:03Z
openaire_data
user-eu
user-caliper
Dijksman, Joshua A.
Dijksman, Joshua A.
2022-06-10
https://doi.org/10.1103/PhysRevLett.128.238002
oai:zenodo.org:10453601
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https://doi.org/10.1103/PhysRevLett.128.238002
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Data for "Creep control in soft particle packings"
info:eu-repo/semantics/other
oai:zenodo.org:8014905
2023-11-20T13:52:12Z
openaire_data
user-eu
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Pinzón, Gustavo
Andò, Edward
Tengattini, Alessandro
Viggiani, Gioacchino
2023-06-08
<p>This dataset corresponds to the raw data and experimental measurements of the PhD thesis "Experimental investigation of the effects of particle shape and friction on the mechanics of granular media" of Gustavo Pinzón (2023, Université Grenoble Alpes), available at: <a href="https://hal.science/tel-04202827v1">https://hal.science/tel-04202827v1</a>. </p><p>The experiments correspond to a drained triaxial compression test of cylindrical granular specimens, a common testing procedure used in soil mechanics to characterise the mechanical response of a specimen under deviatoric loading. Each specimen is 140mm in height and 70mm in diameter, and is composed of more than 20000 ellipsoidal particles of a given aspect ratio and interparticle friction. The dataset comprises the test of six specimens, as a result of the combination of 3 particles shapes (Flat, Medium, and Rounded) and 2 values of interparticle friction (Rough and Smooth). A naming system for the specimens is adopted to reflect the morphology of the composing particles (e.g., the test EFR correspond to the specimen with Flat and Rough particles). Further details on the experimental methods are found in Ch. 2 of the thesis.</p><p> The compression tests are performed inside the x-ray scanner of Laboratoire 3SR in Grenoble (France), where the specimens are scanned each 0.5% of axial shortening, at an isotropic voxel size of 100 micrometer per pixel. The obtained radiographies are reconstructed using a Filtered Back Projection algorithm, using the software given by the x-ray cabin manufacturer (RX Solutions, France). The series of obtained 16-bit greyscale 3D images are processed with the open source software <a href="https://spam-project.gitlab.io/spam/index.html">spam</a>, version 0.6.2. The coordinate system of all the images is ZYX, where Z corresponds to compression direction. Further details on the image analysis techniques are found in Ch. 3 of the thesis.</p><p>Additional greyscale images, raw projections, and x-ray tomography files are available upon request. For visualisation purposes, the 3D images in .tif format can be opened using <a href="https://imagej.net/software/fiji/">Fiji</a>. </p>
https://doi.org/10.5281/zenodo.8014905
oai:zenodo.org:8014905
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https://doi.org/10.5281/zenodo.8014904
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Anisometric particles
Fabric anisotropy
X-ray tomography
Image analysis
Experimental investigation of the effects of particle shape and friction on the mechanics of granular media
info:eu-repo/semantics/other
oai:zenodo.org:5744160
2023-02-01T09:41:33Z
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Pinzón, Gustavo
Andò, Edward
Desrues, Jacques
Viggiani, Gioacchino
2022-01-06
<p>This repository contains the data and processed results of the work "<em>Fabric evolution and strain localisation in inherently anisotropic specimens of anisometric particles (lentils) under triaxial compression</em>", published in Granular Matter (https://link.springer.com/article/10.1007/s10035-022-01305-8).</p>
<p>The study analyses five triaxial compression tests on cylindrical specimens made up of more than nine thousand lentils. Each specimen is prepared with a characteristic orientation (the orientation of the mould for the deposition of the lentils). Repeated x-ray tomography scanning is performed during deviatoric loading, and each scanned step is reconstructed into a 3D volume. Particles are identified in the first 3D volume (in the form of a labelled image) and tracked from the first image all the way through the test using a novel tracking algorithm, enabling the measurement of particle and contact fabric evolution, as well as strain localisation within the specimens. All the procesing is performed using <a href="https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/intro.html">spam</a> (https://ttk.gricad-pages.univ-grenoble-alpes.fr/spam/intro.html) software.</p>
<p> </p>
<p>The <em>Readme.md</em> file contains further details on the experimental campaign, and the structure of the repository. Please refer to the paper "<em>Fabric evolution and strain localisation in inherently anisotropic specimens of anisometric particles under triaxial compression</em>" published on<em> Granular Matter</em> for further details not found on the <em>Readme.md </em>file . Additional information/data not included in this repository is available upon request.</p>
https://doi.org/10.5281/zenodo.5744160
oai:zenodo.org:5744160
eng
Zenodo
https://link.springer.com/article/10.1007/s10035-022-01305-8
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https://doi.org/10.5281/zenodo.5744159
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Anisometric particles
Inherent anisotropy
Fabric
Lab testing
x-ray tomography
Fabric evolution and strain localisation in inherently anisotropic specimens of anisometric particles under triaxial compresion
info:eu-repo/semantics/other
oai:zenodo.org:10824828
2024-03-16T15:12:17Z
openaire_data
user-caliper
Dijksman, Joshua A.
van der Gucht, Jasper
Shakya, Chandan
2024-03-16
https://doi.org/10.5281/zenodo.10824828
oai:zenodo.org:10824828
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https://doi.org/10.5281/zenodo.10824827
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Frontiers in Physics, (2024-03-16)
Data Accompanying "Viscoelastic material properties determine contact mechanics of hydrogel spheres"
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