Article
Chemistry, Multidisciplinary
Xuzhen He
Summary: This paper investigates the relationship between the jamming limits from isotropic compression tests and the critical state through discrete element method (DEM) simulations. The results show that the loosest jammed state line obtained from the isotropic compression method is the same as the critical state pressure-volume fraction line, and the stress state of the critical state can also be well described by a Coulomb-type equation in the octahedral profile.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Z. H. Xu, T. F. Yu, P. Lin, W. Y. Wang, R. Q. Shao
Summary: This study developed a method for fault identification through integration of microstructural, geochemical, and mineralogical characteristics of rocks, and applied it to a specific engineering project for geological analysis. The results provide evidence for fault-induced geochemical effects and mineral transformations, and successfully identified the fault and obtained evidence of weakened mechanical properties of the fault rocks.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Chemical
Jiahui Hao, Yanjie Li, Yi Liu, Jennifer S. Curtis, Yu Guo
Summary: This study examines the jamming phenomenon in shear flows of cylindrical particles with different size distributions and found that at the jamming volume fraction, stress fluctuation and granular temperature reach their maximum values, while the alignment degree of cylindrical particles reaches a minimum.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Yiqiu Zhao, Yuchen Zhao, Dong Wang, Hu Zheng, Bulbul Chakraborty, Joshua E. S. Socolar
Summary: In this study, experimental observations of ultrastable states in a shear-jammed granular system subjected to small-amplitude cyclic shear were reported. Further analyses of the data characterized both global and local responses of these ultrastable states within a shear cycle. The results showed a power-law relation between shear modulus and pressure, two types of contacts with different behaviors, and the spatial correlations of the stress tensor were well fitted by a recent theory.
FRONTIERS IN PHYSICS
(2022)
Article
Computer Science, Information Systems
Osamah Fakhri, George Youssef, Somer Nacy, Adnan Naji Jameel Al-Tamimi, O. Hussein, Wisam T. T. Abbood, Oday Ibraheem Abdullah, Nazar Kais Al-Karkhi
Summary: This paper presents a systematic approach to achieve stable grasping of objects with a two-finger robotic hand filled with granular media. The compaction of the media, controlled by vacuum pressure, was used to adjust the finger's structural and contact stiffness. The study analyzed the grasping stability under the concurrent effect of external torque and applied vacuum pressure. Three control schemes were experimentally applied to ensure effective grasping. The results showed stable and unstable grasping regions for different combinations of torque and vacuum pressure. The two-finger robotic hand can be further improved for high load-carrying applications.
Article
Engineering, Geological
Deyun Liu, Catherine O'Sullivan, J. Antonio H. Carraro
Summary: This study investigates the impact of particle size distribution (PSD) shape on stress transmission in granular materials. By conducting three-dimensional discrete-element method simulations, a wide range of isotropically compressed specimens with spherical particles and different types of PSDs are considered. The stress distribution is analyzed by examining the mean effective particle stresses and the proportion of stress transmitted by particles with different sizes. The results show that there is a correlation between the cumulative distribution of particle sizes and the cumulative distribution of particle sizes by mean effective stress for specimens with continuous PSDs, but this correlation does not hold universally for gap-graded materials. The effective stress distribution among different size fractions in gap-graded materials depends on the size ratio and percentage of finer grains in the specimen, and it is highly sensitive to density.
Article
Engineering, Mechanical
A. Goel, H. N. G. Wadley, V. S. Deshpande
Summary: The study shows that the use of sliding coating layers on structures can manipulate the transfer of momentum during the impact of granular matter, leading to a reduction in momentum transfer on relatively rigid targets but a degradation of impact resistance performance on highly deformable structures.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Thermodynamics
Tristan Calvet, Jean-Mathieu Vanson, Renaud Masson
Summary: A numerical method for calculating the Effective Thermal Conductivity (ETC) of granular media surrounded by a stagnant fluid is presented in this study. It involves creating Representative Volume Elements (RVE) using the Discrete Element Method (DEM) and estimating ETC using Fast Fourier Transform (FFT). The research highlights the significant role of interfaces on computed ETC and proposes improved modeling techniques to better estimate thermal conductivity in granular media.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Mechanical
Hong-wu Song, Wenlong Xie, Shi-Hong Zhang, Weihao Jiang, Lucian Lazarescu, Dorel Banabic
Summary: This study presents a new push bending method using granular media filler for manufacturing thin-walled tubes with small relative bending radius. By investigating the pressure distribution of the granular system, the method strengthens the bending deformation of the tubes, effectively preventing the formation of defects such as wrinkles.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Chemistry, Physical
Seibastien Le Crom, Sandrine Dourdain, Steiphane Pellet-Rostaing, Magali Duvail
Summary: This study investigates the aggregation behavior of a malonamide extractant molecule in different solvents. The insertion of alkyl chains of the extractant molecules into the apolar domain of [EOPip+][NTf2-] has a significant impact on their aggregation behavior, resulting in the formation of smaller and more dispersed aggregates. These findings provide insights for designing more effective solvents for rare earth metal extraction.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Multidisciplinary
Pengqiang Yu, Yang Liu, Muke Shi, Zixuan Chen
Summary: The purpose of this study is to develop a micromechanical-based microstructure model for transversely isotropic granular media and investigate the propagation characteristics of particle rotation waves. The researchers introduced relative deformation tensors to describe local deformational fluctuation and derived the constitutive relations based on micro-macro deformation energy conservation. The study analyzed the dispersion characteristics and bandgap features of particle rotation waves and found that the microstructure model accurately predicted the waves and had a significant impact on their dispersion relations and bandgap widths.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Angel Santarossa, Olfa D'Angelo, Achim Sack, Thorsten Poeschel
Summary: Granular grippers use reversible jamming transition to hold and manipulate objects. Friction, geometry, and suction contribute to their holding force. This study experimentally investigates the effect of particle size on the suction mechanism. It shows that smaller particles achieve better conformation and air-tight seals, while larger particles hinder the suction mechanism due to the gaps between the gripper and the object.
Article
Engineering, Multidisciplinary
Chengzeng Yan, Yuchen Zheng, Duruo Huang, Gang Wang
Summary: A coupled contact heat transfer and thermal cracking model for discontinuous/granular media based on the FDEM framework is proposed in this study. The model considers heat conduction within the continuum, heat transfer through contacts, and the effects of contact heat transfer and thermal cracking. Numerical examples validate the model's capability and sensitivity analysis shows statistically converged results for simulating thermal cracks.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Thermodynamics
Shuo Shi, Kaijun Jiang, Sheng Chen, Zijian Zhou, Xiaoze Du
Summary: This study investigates the shear-induced anisotropy of the effective thermal conductivity (ETC) in granular packings during quasistatic shear deformation. The discrete element method is utilized to track the position, force, and contact condition of each particle in the packing. The ETC of the packing at different shear strains is evaluated using the particle-resolved finite element method. The findings demonstrate that the anisotropy ratio of the ETC can reach 40% when the shear strain increases to 0.11, primarily due to the variation in the contact network formed during consecutive shear steps. Contacts with large contact radius and strong thermal conductance are shown to align preferentially with the direction of deformation, influencing the anisotropy of thermal conductivity. Grouping contacts into sub-networks based on contact strength reveals that the thermal conductivity anisotropy of a packing is predominantly caused by strong contacts.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mathematics, Interdisciplinary Applications
Wojciech Sobieski
Summary: The paper introduces the Waterfall Algorithm for calculating parameters characterizing the spatial structure of granular porous media, and investigates the influence of porosity and particle size on these parameters. New sensitive parameters are proposed in the study, and comparisons with other algorithms for calculating tortuosity are made.
COMPUTATIONAL PARTICLE MECHANICS
(2022)
Article
Operations Research & Management Science
Anna Deza, Antoine Deza, Zhongyan Guan, Lionel Pournin
OPTIMIZATION LETTERS
(2020)
Article
Mathematics, Applied
Antoine Deza, Lionel Pournin, Noriyoshi Sukegawa
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY
(2020)
Article
Mathematics
Julien David, Lionel Pournin, Rado Rakotonarivo
JOURNAL OF COMBINATORIAL THEORY SERIES A
(2020)
Article
Engineering, Chemical
Xin Yi Ong, Spencer E. Taylor, Marco Ramaioli
Review
Computer Science, Interdisciplinary Applications
Daniel Sebastia-Saez, Adam Burbidge, Jan Engmann, Marco Ramaioli
COMPUTERS & CHEMICAL ENGINEERING
(2020)
Article
Engineering, Chemical
Pietro Rando, Marco Ramaioli
Summary: Food 3D Printing is a novel technology that involves manufacturing edible objects with customized shape and structure. The study focuses on the interplay between the rheological and thermal properties of chocolate products, and printing conditions, in order to predict the stability of 3D printed structures. The research proposes a stability criterion based on the local yield stress to explain the stability or collapse of the 3D printed structures.
JOURNAL OF FOOD ENGINEERING
(2021)
Article
Food Science & Technology
Anais Lavoisier, Sathyavageeswaran Shreeram, Michael Jedwab, Marco Ramaioli
Summary: This study investigated the dynamics of different combinations of liquid carriers and solid oral dosage forms during swallowing, revealing promising options for promoting safe swallowing of capsules and tablets. Further clinical studies are needed to confirm these positive effects in healthy and dysphagic patients.
JOURNAL OF TEXTURE STUDIES
(2021)
Article
Engineering, Chemical
P. Rando, J. Engmann, B. Watzke, L. Forny, V. Meunier, M. Ramaioli
Summary: The study proposes a new method to simulate the dynamics of particle sintering and moisture transfer, considering gradients of viscosity, finding that FEM simulations accurately consider the forces between particles compared to commonly used approximate analytical models.
Article
Food Science & Technology
Arnesh Palanisamy, Marco Ramaioli, Paul Menut, Artemio Plana-Fattori, Denis Flick
Summary: This study directly considers the trajectory and swelling of each starch granule through a combination of CFD and DEM simulations, revealing the behavior of starch granules during heating. The results show a shear-induced random walk of particles and indicate that swelling first occurs near the heated wall, followed by migration of swollen granules toward zones of lower solid fraction.
FOOD STRUCTURE-NETHERLANDS
(2021)
Article
Engineering, Chemical
Xin Yi Ong, Spencer E. Taylor, Marco Ramaioli
Summary: This study explores the formation of dry granular jets on liquid surfaces under different parameters, finding that the transition from island formation to jetting occurs when a certain energy ratio is exceeded. Jet formation primarily depends on the kinetic energy of the grains and their wettability, with conditions identified for the formation of dry granular jets containing entrained air in liquids and suggestions for avoiding this in grain dispersion applications.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Arnesh Palanisamy, Gabrielle Moulin, Marco Ramaioli, Artemio Plana-Fattori, Denis Flick, Paul Menut
Summary: This study investigates the rheological properties of dense suspensions prepared with different methods to estimate the mechanical properties of an averaged starch granule. The results show that starch granules have a rough surface and behave as frictional particles. The study also provides the first estimate of the starch granule bulk modulus and demonstrates that the swollen granule shear modulus is temperature independent.
Article
Engineering, Manufacturing
P. Rando, M. Ramaioli
Summary: Sintering is a process where two solids bond together and reduce surface area at high temperatures, impacting processes like 3D printing. A new simulation method has been proposed to consider the effects of temperature changes on sintering dynamics, applicable to various sintering processes.
ADDITIVE MANUFACTURING
(2022)
Article
Food Science & Technology
Anais Lavoisier, Sabrina Boudrag, Marco Ramaioli
Summary: This study quantitatively investigated the impact of saliva on the rheological properties of thickened drinks with different pH. The results showed that saliva reduces the viscosity of thickened water, but has little effect on the rheological properties of lemon drink and orange juice. These findings are important for the management of dysphagia.
JOURNAL OF TEXTURE STUDIES
(2022)
Article
Chemistry, Multidisciplinary
Solomon S. Melides, Dominic Vella, Marco Ramaioli
Summary: The behavior of liquid-air interface on heterogeneous surfaces and the force induced by surface defects were experimentally studied. The experimental results and associated theory provide quantitative understanding of the effects of surface heterogeneities on wetting, paving the way for designing surfaces with desired wetting performances.
Article
Engineering, Chemical
Y. Bugarin-Castillo, P. Rando, M. Clabaux, G. Moulin, M. Ramaioli
Summary: Food 3D Printing technology was used to create customized bite-size food made of pre-gelatinized starch in this study. The mechanical and geometrical properties of the prints were quantified through tests and imaging. The results revealed the impact of food hydration and compression on the structure and properties of the printed food, providing valuable insights for developing food products for specific consumer needs.
JOURNAL OF FOOD ENGINEERING
(2023)