Article
Engineering, Chemical
Fan Zhu, Jidong Zhao
Summary: This computational study explores the interactive evolution of particle shape and particle breakage for granular material under confined compression. The findings demonstrate that particle shape significantly influences particle strength and crushing pattern, with sphericity playing a key role in determining these factors.
Article
Geosciences, Multidisciplinary
Lucille Carbillet, Fabian B. Wadsworth, Michael J. Heap, Patrick Baud
Summary: The strength of porous rocks varies depending on the porosity and grain size. Synthetic samples showed that different models are needed to accurately predict strength for high-porosity granular samples and low-porosity non-granular samples. A regime plot was proposed to determine the suitable micromechanical model for strength prediction based on porosity and grain size.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
William W. Gerberich, Kevin M. Schmalbach, Youxing Chen, Eric Hintsala, Nathan A. Mara
Summary: The study utilizes a high-throughput analytical model to predict fracture behavior with relatively few experimentally determined parameters. This approach could accelerate new materials discovery and has shown promise in validating fracture behavior on two single crystal materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Ritesh Dadhich, Alankar Alankar
Summary: A FFT-based modular solver for crystal plasticity is proposed in this paper. It solves the balance of momentum in a global iterative loop and single crystal plasticity in an inner loop using an implicit time integration scheme. The response of single crystals is modeled by coupling slip system based constitutive equations to crystal kinematics. The solver is validated against experimental data and shows excellent agreement. The FFT solver is also used to analyze the deformation behavior of a dual phase polycrystal and exhibits good accuracy compared to an open-source finite element crystal plasticity solver.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Mechanics
Ingrid Holte, Ankit Srivastava, Emilio Martinez-Paneda, Christian F. Niordson, Kim L. Nielsen
Summary: The study explores the influence of inter-void spacing and gradient-induced material size effect on void coalescence under different stress states. It was found that decreasing inter-void ligament size increases the propensity for void coalescence in the absence of strain gradient effects, but strain gradients in the material matrix harden the inter-void ligament and decrease this effect.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Multidisciplinary
Jacinto Ulloa, Nima Noii, Roberto Alessi, Fadi Aldakheel, Geert Degrande, Stijn Francois
Summary: This paper presents a novel variational phase-field model to describe fracture processes in saturated porous media. The model utilizes a micromechanics-based theory to connect field variables with physical mechanisms at the microcrack level, where damage and plasticity arise from microcrack growth and frictional sliding. The model also considers hydromechanical coupling effects and incorporates a non-associative frictional plasticity law.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Chemical
Matti Lindroos, Tom Andersson, Anssi Laukkanen, Laura Suarez, Jorgen Kajberg, Par Jonsen, Juuso Terva, Marke Kallio
Summary: This study focuses on modeling the deformation and damage behavior of manganese containing slag materials to investigate the possibility of metal separation after comminution of the slags. By using finite element micromechanical description of the material behavior and slag microstructure, the study presents a workflow on how digitalization and multi-scale material modeling can contribute to the development of efficient comminution means for hard to process secondary raw materials.
MINERALS ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Kasra Farain, Daniel Bonn
Summary: The question of when dense granular materials start to flow under stress has not been resolved. A simple equation based on frictional aging of the granular packing is developed and tested, resulting in a nonmonotonic stress-strain relation independent of shear rate. This relation helps understand the quasistatic deformations and solid-to-liquid transition of aging granular media. It also explains the flow history dependence of mechanical properties and sensitivity to initial preparation of granular media.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
M. Meindlhumer, T. Ziegelwanger, J. Zalesak, M. Hans, L. Loefler, S. Spor, N. Jaeger, A. Stark, H. Hruby, R. Daniel, D. Holec, J. M. Schneider, C. Mitterer, J. Keckes
Summary: This study demonstrates that the formation of precipitates in the Al 0.9 Cr 0.1 N thin films, induced by vacuum annealing, enhances the cohesive energy of grain boundaries, altering the crack propagation pathway and resulting in the simultaneous improvement of Young's modulus, fracture stress, and fracture toughness.
Article
Materials Science, Multidisciplinary
X. Tang, J. Yang
Summary: This study presents a novel grain-scale model to investigate the effect of particle morphology on elastic wave propagation in granular materials. The results show that increasing particle aspect ratio leads to a notable rise in elastic wave velocity, while increased particle blockiness causes a moderate reduction in velocity. Furthermore, particles with higher aspect ratio have a broader range of transmitted frequencies compared to those with greater blockiness.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Laurent Lacaze, Joris Bouteloup, Benjamin Fry, Edouard Izard
Summary: This study investigates the collapse of a granular column in a liquid using numerical simulations, focusing on the influence of Stokes number St and the initial volume fraction phi(i) on the dynamics of the collapse. A dedicated numerical model with a discrete element method is used to provide a comprehensive description of the granular phase in dense granular flows. The research aims to characterize the dynamics of the collapse and its final deposit in relation to (St, phi(i)), as well as to describe the granular rheology and dilatancy effects based on these two dimensionless numbers.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Geological
Chaojun Jia, Sheng Zhang, Weiya Xu
Summary: A micromechanical-based elastoplastic damage model was proposed for saturated hard rock based on triaxial compression tests on amygdaloidal basalt under different pore pressures. The model includes hydromechanical coupling formulated using the thermodynamic framework and new plastic and damage criteria to describe the evolutions of the internal variables. The permeability evolution is estimated by the volumetric averaging of the local permeability in microcracks, and the model captures well the main mechanical behaviors and permeability evolution properties of saturated hard rock.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Chiheb Naili, Issam Doghri
Summary: A predictive micromechanical approach is proposed for porous materials with an elastic-plastic matrix phase. The method determines the volume fractions using a maximum packing argument and computes the effective properties of single hollow solids using an energy-based approach. For reinforced porous materials, a two-level method is adopted. The predictions have been verified against reference full-field FE results and show good agreement.
MECHANICS OF MATERIALS
(2023)
Article
Mechanics
Payam Poorsolhjouy, Marcial Gonzalez
Summary: This study presents constitutive laws of structural members using granular micromechanics approach, deriving macroscopic behavior by investigating average behavior of grain-pair interactions. Closed-form solutions for constitutive relationship of uniform and functionally graded materials are derived, demonstrating versatility and computational efficiency of the proposed approach. Analyzing structural members made of particle-binder composites reveals interesting one-way and two-way coupling behavior between internal forces and moments that cannot be achieved through closed-form solutions.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
G. Saingier, A. Sauret, P. Jop
Summary: The study investigates the flow of dry granular materials entering water, focusing on the transition from dry to wet grains, and systematically characterizes the phase of liquid invading a dense granular medium using experiments, analytical modelling, and numerical tools. Comparisons are made with a confined granular jet entering a water bath, providing insight into the interplay between dry grains and a liquid leading to particle dispersion.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
N. P. Kruyt, O. Millet
JOURNAL OF FLUID MECHANICS
(2017)
Article
Engineering, Mechanical
D. G. J. Detert Oude Weme, M. S. van der Schoot, N. P. Kruyt, E. J. J. van der Zijden
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2018)
Article
Mechanics
Mehdi Pouragha, Niels P. Kruyt, Richard Wan
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2019)
Article
Engineering, Chemical
Chao-Fa Zhao, Niels P. Kruyt, Olivier Millet
Article
Engineering, Chemical
Chao-Fa Zhao, Niels P. Kruyt, Olivier Millet
Article
Engineering, Geological
Long Xue, Niels P. Kruyt, Rui Wang, Jian-Min Zhang
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2019)
Article
Mechanics
N. P. Kruyt, L. Rothenburg
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2019)
Article
Engineering, Chemical
Chao-Fa Zhao, Niels P. Kruyt, Olivier Millet
Article
Engineering, Mechanical
Jie Wang, Niels P. Kruyt
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Mechanics
Chao-Fa Zhao, Niels P. Kruyt
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Mechanics
Mehdi Pouragha, Niels P. Kruyt, Richard Wan
Summary: This study investigates the non-coaxial plastic flow in granular media, proposing a general form for plastic flow based on multi-mechanism plasticity theory. Results show that the plastic yielding direction is not coaxial with the current stress at a given stress state. The significance of non-coaxial plastic flow diminishes as peak stress is achieved.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Computer Science, Interdisciplinary Applications
Chao-Fa Zhao, Gustavo Pinzon, Max Wiebicke, Edward Ando, Niels P. Kruyt, Gioacchino Viggiani
Summary: X-ray tomography measurements were used to provide experimental data on contact fabric anisotropy inside shear bands for two granular soils, supporting the validity of ACST. The results showed unique values for fabric anisotropy and coordination number at large strains, with the rate at which the critical state is approached increasing with the roundness of the material. The evolution of fabric anisotropy measured from the experiments was well reproduced by the proposed evolution law.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Mechanical
Jie Wang, Niels P. Kruyt
Summary: Research has shown that forward sweep and circumferential skew can improve the aerodynamic performance of small hub-to-tip ratio fans, while forward dihedral and axial skew can increase the total-to-static efficiency. However, backward shape variety generally has negative aerodynamic effects, and the pressure reduction caused by sweep and dihedral is limited.
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Chao-Fa Zhao, Niels P. Kruyt
Summary: The study compares the rotational behavior of granular materials at the particle level to the continuum level, finding that the average particle rotation closely matches the continuum rotation. X-ray tomography of granular soil under triaxial compression further supports this observation. The presence of contact couples is found to have a significant effect on stress ratios and volumetric strain in simulations. Stress tensors remain symmetric even with the inclusion of contact couples.
JOURNAL OF ENGINEERING MECHANICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Chaofa Zhao, Niels P. Kruyt, Mehdi Pouragha, Richard Wan
Summary: The microstructure of granular materials has a significant influence on their macroscopic strength and behavior, which can be quantified by a fabric tensor. This study investigates the changes in the fabric tensor when subjected to different strain loadings in different directions. The results show that the fabric responses in-plane and out-of-plane are effectively decoupled.
COMPUTERS AND GEOTECHNICS
(2022)