Article
Engineering, Multidisciplinary
Dingeman L. H. van der Haven, Ioannis S. Fragkopoulos, James A. Elliott
Summary: In this work, a volume-interaction level set DEM (VLS-DEM) approach is proposed for physically accurate simulations of particles with arbitrary geometries. VLS-DEM uses an Octree integration algorithm to compute the overlap volume instead of surface nodes for interparticle forces calculation. Tests show that VLS-DEM gives physically accurate results comparable to analytical theory, even for complex systems with concave interlocked particles.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
J. Duriez, S. Bonelli
Summary: The LS-DEM method extends DEM for arbitrary grain shapes by storing distance-to-surface values on a grid and considering boundary nodes, affecting precision and computational costs. For triaxial compression of spherical particles, LS-DEM requires smaller grid spacing and more boundary nodes to approach reference results, resulting in a significant increase in computational costs. Simple OpenMP parallel simulations can reduce the time cost increase in LS-DEM.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Environmental
Hag Sung Lee, Kyu Hwan Choi, Jin Kyoung Park, Hyang Mi Lee, Jieun Lee, Jin Woong Kim, Sang Hyuk Im, Bum Jun Park
Summary: Polymeric microparticles with highly porous structures were fabricated using the piezoelectric inkjet method, which can transform into a Janus-like structure by adding a swelling solvent. The use of more than two different polymers results in kinetically stable particles. The developed inkjet method can be used for producing composite particles encapsulated with functional nanoparticles and coating or patterning them directly onto a substrate.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Environmental Sciences
Roberto Rosal
Summary: The study introduces a morphological description method for microplastic particles based on lengths of the smallest enclosing orthogonal parallelepiped, with three dimensionless parameters describing particle shape. It also discusses the importance of particle size and the derivation of Stoke's diameter based on 3D morphological descriptors. The study highlights the need for equations specifically developed for plastic particles, especially for fibers, and for the atmospheric compartment.
MARINE POLLUTION BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Eun Ji Kim, Jaeman J. Shin, Taeyang Do, Gue Seon Lee, Juhae Park, Vikarm Thapar, Jinwoong Choi, Joona Bang, Gi-Ra Yi, Su-Mi Hur, Jeung Gon Kim, Bumjoon J. Kim
Summary: The self-assembly behavior of block copolymers under confinement was studied, with a focus on the morphological transitions observed. It was found that morphological transitions occur at higher molecular weights, with onion-like particles transitioning to striped ellipsoids. The formation process of ellipsoidal particles was also compared with that of onion-like particles, showing differences in the development of lamella domains. Additionally, the shape anisotropies of the ellipsoidal particles were analyzed as a function of particle size, highlighting their potential for various applications.
Article
Chemistry, Physical
E. Kraleva, A. Fedorov, C. Kreyenschulte, E. Fedorova, U. Armbruster, S. Wohlrab
Summary: In this study, ternary Fe-Zn-Al oxide nanostructured material was prepared either by co-precipitation in water-in-oil microemulsion or the citrate method. The structural features of the samples were analyzed by various experimental techniques and their catalytic behavior in CO2 hydrogenation was determined. The results showed that the microemulsion method resulted in a composite material with epitaxial growth of pure iron oxide on a Fe-Zn-Al oxide parent structure, which is of potential interest for catalytic applications or transfer to other multinary systems.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Geological
Yulong Zhang, Jianfu Shao, Zaobao Liu, Chong Shi
Summary: This paper presents a numerical study on the dynamic behavior of rock avalanches, focusing on the influence of particle shape, size, and gradation on velocity and energy transformation process of falling rock clusters.
Article
Computer Science, Interdisciplinary Applications
Dong Su, Xiang Wang
Summary: This paper develops a DEM framework for two-dimensional star-shaped particles with concave features, using Fourier series expansion for particle contours and tailored contact detection and resolution methods. A multilevel approach is used to identify multiple contacts, and methods for determining contact geometric features and calculating contact forces are presented. The developed DEM program-SSP2D is demonstrated to be efficient in modeling dynamic and pseudo-static behaviors of concave particles.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Chemical
Chong Peng, Ling Zhan, Wei Wu, Bingyin Zhang
Summary: The study presents a three-dimensional fully resolved SPH-DEM method for modeling suspensions with non-Newtonian fluids and solid particles of arbitrary shape. A hybrid contact method is proposed for modeling interactions in a generalized fashion, and GPU parallelization is employed for increased numerical efficiency. Validation using numerical examples indicates suitability for heterogeneous flows with irregular solid particles.
Article
Mathematics, Applied
Yan Wang, Xufeng Xiao, Xinlong Feng
Summary: This paper presents a novel numerical algorithm for efficient modeling of three-dimensional shape transformation governed by the modified Allen-Cahn equation. The proposed method achieves high precision and high efficiency through operator splitting, temporal p-adaptive strategy, and parallel least distance modification technique.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Engineering, Chemical
Haoran Zhou, Qingshan Meng, Qinglong Qin, Kai Wu, Youkou Dong
Summary: A systematic method is proposed to generate nonstar-like particles satisfying target shape descriptors. By utilizing complex functions and correlation analysis, the method successfully generates particles randomly, and its efficiency and stability are proven through tests.
Article
Computer Science, Interdisciplinary Applications
Mehdi Divsalar, Marzieh Ahmadi, Maryam Ghaedi, Alessio Ishizaka
Summary: This paper proposes a hybrid multi-criteria decision-making method based on the TODIM approach in a hyperbolic fuzzy environment. The method effectively deals with complexity and uncertainty in real-world problems and provides a more objective decision-making process by incorporating hyperbolic fuzzy sets and the Kano model.
COMPUTERS & INDUSTRIAL ENGINEERING
(2023)
Article
Acoustics
Zhao-xi Li, Ya-an Li, Kai Zhang
Summary: The study introduces a new method of mathematical morphological filtering based on morphological features, aiming to extract ship signal features more effectively, suppress noise while preserving nonlinear characteristics. By processing the stimulation signal with different structure elements, the effectiveness of morphological filtering on noise suppression and preservation of nonlinear characteristics is confirmed. Using a flat structure element, the measured ship-radiated noise signals are processed with an average filter, and analysis of the filtered signals on the frequency spectrum shows successful extraction of effective information compared to other filters.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Mathematics, Interdisciplinary Applications
Pei Zhang, Yueshi Dong, S. A. Galindo-Torres, A. Scheuermann, Ling Li
Summary: DEM has been successful in simulating complex granular material behaviors, but describing particles with realistic geometries is a challenge. Various shape description methods have been developed, but often limited to regular shapes. A metaball based DEM is proposed to model general shaped particles with flexibility in control points selection, handling particle collision through an optimization problem.
COMPUTATIONAL MECHANICS
(2021)
Article
Engineering, Mechanical
Hui Liang, Yang Shen, Junhong Xu, Shizhuang Chen
Summary: Particle morphology is an important characteristic of granular materials, and a multiscale description of morphology can provide insights into the macroscopic behaviors. This study investigated the morphological features of natural sands using spherical harmonic analysis and developed three-dimensional printing for mass manufacture of grains with controlled morphology and material properties. Triaxial tests were conducted on the printed grains, revealing significant strain-softening and volume-dilation behaviors. The irregularly shaped particles exhibited enhanced shear strength and bulk dilation compared to the volume-equivalent spheres. The enhancement of shear strength was found to decrease from the general form to surface roughness, while the enhancement of dilation was strongest at the medium-scale level of local roundness.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Li Chen, Peter Z. Berke, Thierry J. Massart, Lars A. A. Beex, Marco Magliulo, Stephane P. A. Bordas
Summary: The quasicontinuum (QC) method is a concurrent multiscale approach that combines fully resolved lattice models in small regions of interest and coarse-grained models elsewhere. A new refinement indicator based on the energies of cells at coarse-grained domain surfaces is introduced in this study. This indicator is incorporated in an adaptive scheme of a generalized QC method, showing its impact on adaptive simulations in various lattice deformation scenarios.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Arnaud Mazier, Alexandre Bilger, Antonio E. Forte, Igor Peterlik, Jack S. Hale, Stephane P. A. Bordas
Summary: This paper presents a framework for solving inverse deformation problems using the FEniCS Project finite-element software. The proposed method can compute the undeformed configuration by solving only one modified elasticity problem, with complexity comparable to the standard one. The use of the high-level unified form language (UFL) allows for flexible design and easy modification of constitutive models.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Biomedical
Stephane Urcun, Pierre-Yves Rohan, Giuseppe Sciume, Stephane P. A. Bordas
Summary: This paper investigates the complex time-dependent behavior of cortex tissue using a two-phase flow poroelastic model under adiabatic condition. The cortex tissue is modeled as a porous solid saturated by two immiscible fluids, with dynamic viscosities separated by four orders. The solution is computed using a monolithic scheme within the open-source computational framework FEniCS. The study shows the potential of multiphase poromechanics in providing a unified brain tissue modeling framework in various settings.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Engineering, Mechanical
Patricio Peralta, O. Rafael Ruiz, Hussein Rappel, P. A. Stephane Bordas
Summary: This new framework utilizes dynamic estimators to infer the electromechanical properties in Piezoelectric Energy Harvesters (PEHs), overcoming the mismatch issue in updating properties associated with a set of PEHs. By modifying the likelihood function, the framework is able to account for a predictive model with three outputs obtained from the FRF.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Civil
Sheng He, Siliu Yu, Weijing Yun, Stephane P. A. Bordas, Peng Yu
Summary: This paper examines the seismic behavior of Kiewitt-Sunflower single layer spherical reticulated shells using a proposed damage constitutive model for thin-walled circular steel tubes and the time history method. The failure mode of this type of shell during earthquakes is determined through numerous numerical examples. Additionally, the impact of factors such as damage accumulation, rise-span ratio, initial geometric imperfection, types of seismic waves, and amplitude modulation ratio on the dynamic response of the shell structure is explored. Furthermore, a structural damage factor is proposed and shown to accurately assess the damage and failure behavior of these structures under earthquake and post-earthquake conditions.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Mechanics
Theo Clayton, Ravindra Duddu, Martin Siegert, Emilio Martinez-Paneda
Summary: The study introduces a phase field-based computational model for simulating the mechanistic growth of crevasses in glacial ice, offering insights into mass loss processes of glaciers and ice sheets. The model shows good agreement with analytical methods, demonstrating its potential in simulating crevasse growth and interaction.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Biomedical
T. Lavigne, A. Mazier, A. Perney, S. P. A. Bordas, F. Hild, J. Lengiewicz
Summary: This study demonstrated the feasibility of using FE-based DVC technology to measure the deformation of female breast tissues in different body positions, successfully capturing the large displacement field of hard/soft tissue samples and providing a new approach for capturing large tissue deformations.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Engineering, Mechanical
Yuxiang Gao, Matthew Berger, Ravindra Duddu
Summary: We investigate the generalization of a CNN-based surrogate for the phase field model in predicting damage and peak load under uniaxial tension using 2D microstructure images of a unidirectional fiber-reinforced composite. A two-stage approach is proposed to predict peak load by transforming the microstructure image to a damage field and then predicting peak load from the damage field. The damage field provides valuable cues for the CNN to generalize across new microstructures within the training range.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Engineering, Biomedical
A. Elouneg, J. Chambert, A. Lejeune, Q. Lucot, E. Jacquet, S. P. A. Bordas
Summary: Human skin is an anisotropic material due to the alignment of collagen fibers in the dermis, resulting in greater stiffness in a certain direction known as Langer's line. This paper introduces a numerical framework, MARSAC, along with a commercial device, CutiScan CS 100, to assess the anisotropic properties of human skin. The framework utilizes video inputs and applies the Digital Image Correlation technique to determine displacement fields and calculate material parameters such as Langer's line and elastic moduli. The method was validated using data from a public repository and showed consistent results with previous studies. The innovation lies in accurately and rapidly measuring Langer's line on small areas using the CutiScan CS 100 probe, and validating an analytical model based on deformation ellipticity.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Robert E. Bird, Charles E. Augarde, William M. Coombs, Ravindra Duddu, Stefano Giani, Phuc T. Huynh, Bradley Sims
Summary: This paper presents a 2D hp-adaptive discontinuous Galerkin finite element method for phase field fracture that can reliably and efficiently solve phase field fracture problems with arbitrary initial meshes. The method uses a posteriori error estimators to drive mesh adaptivity based on both elasticity and phase field errors, and it is validated on several example problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Yuxiang Gao, Gourab Ghosh, Stephen Jimenez, Ravindra Duddu
Summary: A finite-element-based cohesive zone model is proposed to simulate the nonlinear fracture process driving the propagation of water-filled surface crevasses in floating ice tongues. The study finds that viscous strain accumulation promotes crevasse propagation and that surface crevasses propagate deeper in ice shelves/tongues if depth-varying ice density and temperature profiles are considered.
COMPUTING IN SCIENCE & ENGINEERING
(2023)
Article
Geography, Physical
Alex Huth, Ravindra Duddu, Benjamin Smith, Olga Sergienko
Summary: Rifts in ice shelves play a crucial role in ice shelf weakening and the calving of tabular icebergs. A computational modeling framework has been developed to understand the rift propagation process and simulate the calving events. The study provides valuable insights into the interaction between ice sheets and climate, as well as the impact of ice shelf buttressing on land ice flow.
JOURNAL OF GLACIOLOGY
(2023)
Article
Thermodynamics
Anas Obeidat, Thomas Andreas, Stephane P. A. Bordas, Andreas Zilian
Summary: This study investigates the impact of pressure reserve capacity on gas-dynamic pressure surges and adiabatic compression in a respirator oxygen valve, using a three-dimensional remeshed smoothed particle hydrodynamics method. It is found that the pressure reserve capacity significantly affects the simulated flow fields, and a modified valve design with damping effect improves valve functionality and safety. The numerical results are in agreement with a previous study, demonstrating the accuracy of the simulation method.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Computer Science, Interdisciplinary Applications
S. M. Dsouza, T. Khajah, X. Antoine, S. P. A. Bordas, S. Natarajan
Summary: The paper compares the performance of Lagrange-based finite element method and non-uniform rational B-splines isogeometric analysis in dealing with time-harmonic acoustic exterior scattering problems, finding that regardless of the polynomial order, IGA provides a higher accuracy per degree of freedom than the traditional finite element method.
MATHEMATICAL AND COMPUTER MODELLING OF DYNAMICAL SYSTEMS
(2021)
Article
Mechanics
Sofia Farina, Susanne Claus, Jack S. Hale, Alexander Skupin, Stephane P. A. Bordas
Summary: An in-depth understanding of brain energy metabolism is crucial for addressing neurodegenerative diseases, with astrocytes playing a key role. Recent research suggests that the complex morphology of astrocytes affects their efficiency in metabolizing nutrients and providing energy to neurons, and modeling and simulation are effective tools for further understanding in this area. The proposed numerical method in this paper allows for the study of simplified metabolic pathways in astrocytes with complex cell morphologies, providing an accurate and user-friendly alternative to traditional methods.
ADVANCED MODELING AND SIMULATION IN ENGINEERING SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Yanzheng Wang, Qian Wu, Yiran Tian, Guoliang Huang
Summary: This paper proposes the microstructure design of an odd plate and investigates the directional wave energy amplification and the presence of interface waves in odd plates through theoretical and numerical analysis. The research findings contribute to the understanding of elastic behavior in 2D non-Hermitian systems.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
F. Greco, D. Codony, H. Mohammadi, S. Fernandez-Mendez, I. Arias
Summary: This study overcomes the difficulty of harnessing the flexoelectric effect by designing multiscale metamaterials. Through topology optimization calculations, we obtain optimal structures for various apparent piezoelectric properties and find that low-area-fraction lattices are the preferred choice. The results show competitive estimations of apparent piezoelectricity compared to reference materials such as quartz and PZT ceramics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xiaoxuan Zhang, Tryaksh Gupta, Zhenlin Wang, Amalie Trewartha, Abraham Anapolsky, Krishna Garikipati
Summary: This study presents a computational framework for coupled electro-chemo-(nonlinear) mechanics at the particle scale in solid-state batteries, including interfacial fracture, degradation in charge transfer, and stress-dependent kinetics. The discontinuous finite element method allows for arbitrary particle shapes and geometries.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Chengguan Zhang, Xavier Balandraud, Yongjun He
Summary: The coexistence of both austenite and martensite is a common characteristic in Shape Memory Alloys (SMAs). The multiple-domain microstructures, consisting of austenite, martensite twins, and individual martensite variants, evolve collectively during the phase transformation, affecting the material's macroscopic response. This paper presents an experimentally observed interface consisting of five domains in a Ni-Mn-Ga single-crystal, and analyzes the effects of thermal loading path and material initial state on the domain pattern formation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Shaobao Liu, Haiqian Yang, Guang-Kui Xu, Jingbo Wu, Ru Tao, Meng Wang, Rongyan He, Yulong Han, Guy M. Genin, Tian Jian Lu, Feng Xu
Summary: The balance between stress and adhesion plays a crucial role in governing the behaviors of adherent cells, such as cell migration. In certain microenvironments, such as tumor, variations in hydrostatic pressure can significantly impact cell volume and adhesion, which in turn affects cell behavior.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xun Xiong, Qinglei Zeng, Yonghuan Wang, Ying Li
Summary: In this work, the authors investigate the possibility of enhancing the resistance to crack growth in brittle materials through microstructure design. They establish a computational framework to simulate crack propagation and characterize fracture energy. The effects of different types of voids on toughening mechanisms are explored, and the critical conditions for embrittlement-toughening transition are identified. The study also discusses the difference between void toughening in brittle and ductile materials, and extends the toughening strategy to nacre-like materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Huan Wang, Yong-Quan Liu, Jiu-Tao Hang, Guang-Kui Xu, Xi-Qiao Feng
Summary: This study establishes a cytoarchitectural model to accurately capture the buckling and postbuckling behaviors of epithelia under fast compression. The stress evolution of epithelia is divided into three stages: loading, phase transition, and stress recovery. The postbuckling process is governed by the active tension generated by the actomyosin network. The study also proposes a minimal model that predicts the flattening time and stress recovery extent as functions of applied strain or strain rate, in agreement with simulations and experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Lei Liu, Hao Liu, Yuming He, Dabiao Liu
Summary: This study investigates the mechanics and topologically complex morphologies of twisted rubber filaments using a combination of experiment and finite strain theory. A finite strain theory for hyperelastic filaments under combined tension, bending, and torsion has been established, and an experimental and theoretical morphological phase diagram has been constructed. The results accurately determine the configuration and critical points of phase transitions, and the theoretical predictions agree closely with the measurements.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Abhishek Painuly, Kunnath Ranjith, Avinash Gupta
Summary: This paper analyzes the interfacial waves caused by frictional slipping and studies their dispersion relation and wave modes. By studying the slip waves in a geophysical model, the surface wave dispersion phenomenon is explored, and an alternative explanation is proposed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Houlin Xu, Joshua Vievering, Hoang T. Nguyen, Yupeng Zhang, Jia-Liang Le, Zdenek P. Bazant
Summary: Motivated by the extraordinary strength of nacre, this study investigated the probabilistic distribution of fishnet strength using Monte Carlo simulations and found that previous analytical solutions are not applicable for fishnets with a large number of links. By approximating large-scale fishnets as a continuum with cracks or holes, the study revealed that the strength distribution follows the Weibull distribution. This new model has significance for optimizing the strength-weight ratio in printed material structures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Souhayl Sadik, Arash Yavari
Summary: This paper revisits the mathematical foundations of nonlinear viscoelasticity and studies the geometry of viscoelastic deformations. It discusses the decomposition of the deformation gradient into elastic and viscous distortions and concludes that the viscous distortion can only be a two-point tensor. The governing equations of nonlinear viscoelasticity are derived and the constitutive and kinetic equations for various types of viscoelastic solids are discussed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Wen Cheng, Hongkuan Zhang, Yu Wei, Kun Wang, Gengkai Hu
Summary: In this study, we propose a phenomenon similar to Thouless pumping for a continuous in-plane elastic system, enabling topological transport of elastic waves through spatial modulation of material elasticity. By incorporating specific lattice microstructures, termed pentamode materials, precise and robust control over elastic wave propagation is achieved.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Linda Werneck, Mertcan Han, Erdost Yildiz, Marc-Andre Keip, Metin Sitti, Michael Ortiz
Summary: We have developed a simple model that describes the ionic current through neuronal membranes by considering the membrane potential and extracellular ion concentration. The model combines a simplified Poisson-Nernst-Planck model of ion transport through individual ion channels with channel activation functions calibrated from experimental data. The calibrated model accounts for the transport of calcium, sodium, potassium, and chloride and shows remarkable agreement with experimentally measured current-voltage curves for human neural cells.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
