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Models for Advanced Granular Materials: Synthesis, Characterization and Application
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Models for Advanced Granular Materials: Synthesis, Characterization and Application

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Simulation and Design".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 4426

Special Issue Editors

Prof. Dr. Gaël Combe

E-Mail Website
Guest Editor
Grenoble Institute of Technology and Management, Université Grenoble Alpes, Grenoble, France
Interests: granular materials, discrete element modelling, multiscale approach
Dr. Vincent Richefeu

E-Mail Website
Guest Editor
Université Grenoble Alpes
Interests: granular materials; fluid coupling; Discrete Element Modeling; multiscale approaches

Special Issue Information

Dear Colleagues,

Discrete element approaches have been widely used to model granular materials in dynamic as well as static applications. At the very beginning, the configurations handled were two-dimensional, with solid circular particles and a totally empty pore space. Nowadays, this type of model has been considerably enriched, and particles can now be complex in shape, highly deformable, breakable, or erodible. The space volume between the particles has also been made more sophisticated by adding an inter-granular matrix or fluid like a gas and/or a liquid. The loading process itself is becoming more and more complex and sometimes requires adjustments to the numerical method. Discrete Element Modeling (DEM) coupling with various numerical methods (LBM, FEM, LEM, MPM, etc.) as well as multi-scale considerations can also be of interest to this Special Issue.

In a nutshell, the purpose of this Special Issue is to provide a set of different numerical techniques taking into account the increasing sophistication in the composition or in the mechanical responses of advanced granular materials. The idea is also to illustrate the need for this higher complexity in fundamental or industrial applications.

Prof. Dr. Gaël Combe
Dr. Vincent Richefeu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Discrete Element Modeling
  • crushable particles
  • complex shaped particles
  • highly deformable particles
  • multiphase granular materials
  • complex loadings
  • multiscale numerical methods

Published Papers (2 papers)

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Research

21 pages, 11868 KiB  
Article
Effect of Particle Morphology on Stiffness, Strength and Volumetric Behavior of Rounded and Angular Natural Sand
by Aashish Sharma, Alexia R. Leib-Day, Mohmad Mohsin Thakur and Dayakar Penumadu
Materials 2021, 14(11), 3023; https://doi.org/10.3390/ma14113023 - 2 Jun 2021
Cited by 10 | Viewed by 2472
Abstract
Stress–strain and volume change behavior for clean sands which have distinct particle shape (rounded and angular) with very similar chemical (mineralogical) composition, size, and texture in one-dimensional (1D) compression and drained triaxial compression are presented. The effect of particle morphology on the crushing [...] Read more.
Stress–strain and volume change behavior for clean sands which have distinct particle shape (rounded and angular) with very similar chemical (mineralogical) composition, size, and texture in one-dimensional (1D) compression and drained triaxial compression are presented. The effect of particle morphology on the crushing behavior in one-dimensional loading is explored using laser light diffraction technique which is suitable for particle crushing because of its high resolution and small specimen volume capability. Particle size distribution in both volume/mass and number distributions are considered for improved understanding associated with the process of comminution. Number distributions present a clearer picture of particle crushing. It is argued that particle crushing in granular assemblies initiates in larger particles, rather than in smaller particle. It was found that rounded sand specimens showed greater crushing than angular sand specimens with higher uniformity coefficient. In 1D compression, loose specimens compress approximately 10% more than dense specimens irrespective of particle shape. Densification of angular sand results in improvement in stiffness (approximately 40%) and is comparable to that of loose rounded sand. In general, density has a greater influence on the behavior of granular materials than particle morphology. The effect of particle shape was found to be greater in loose specimens than in dense specimens. The effect of grain shape on critical state friction angle is also quantified. Full article
(This article belongs to the Special Issue Models for Advanced Granular Materials: Synthesis, Characterization and Application)
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17 pages, 6959 KiB  
Article
Compression-Induced Tensile Mechanical Behaviors of the Crystalline Rock under Dynamic Loads
by Bowen Zheng, Shengwen Qi, Xiaolin Huang, Ning Liang and Songfeng Guo
Materials 2020, 13(22), 5107; https://doi.org/10.3390/ma13225107 - 12 Nov 2020
Cited by 1 | Viewed by 1545
Abstract
Characterization of the tensile mechanical behaviors of rocks under dynamic loads is of great significance for the practical engineering. However, thus far, its micromechanics have rarely been studied. This paper micromechanically investigated the compression-induced tensile mechanical behaviors of the crystalline rock using the [...] Read more.
Characterization of the tensile mechanical behaviors of rocks under dynamic loads is of great significance for the practical engineering. However, thus far, its micromechanics have rarely been studied. This paper micromechanically investigated the compression-induced tensile mechanical behaviors of the crystalline rock using the grain-based model (GBM) by universal distinct element code (UDEC). Results showed that the crystalline rock has the rate- and heterogeneity-dependency of tensile behaviors. Essentially, dynamic Brazilian tensile strength increased in a linear manner as the loading rate increased. With the size distribution and morphology of grain-scale heterogeneity weakened, it increased, and this trend was obviously enhanced as the loading rate increased. Additionally, the rate-dependent characteristic became strong with the grain heterogeneity weakened. The grain heterogeneity prominently affected the stress distribution inside the synthetic crystalline rock, especially in the mixed compression and tension zone. Due to heterogeneity, there were tensile stress concentrations (TSCs) in the sample which could favor microcracking and strength weakening of the sample. As the grain heterogeneity weakened or the loading rate increased, the magnitude of the TSC had a decreasing trend and there was a transition from the sharp TSC to the smooth tensile stress distribution zone. The progressive failure of the crystalline rock was notably influenced by the loading rate, which mainly represented the formation of the crushing zone adjacent to two loading points. Our results are meaningful for the practical engineering such as underground protection works from stress waves. Full article
(This article belongs to the Special Issue Models for Advanced Granular Materials: Synthesis, Characterization and Application)
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