Article
Mechanics
Xiaole Li, Shuai Lu, Gilles Lubineau
Summary: This study focuses on the use of bridging mechanisms to toughen the interface of laminated composites, exploring the theoretical analysis of fracture resistance enhancement through bridging in a composite double cantilever beam (DCB). The research reveals crack trapping, snap-back instability, and the overall toughness contributions, providing insights into the physics related to the structural response of DCB with discrete toughening elements. A dimensionless quantity for evaluating snap-back instability intensity and the role of geometrical properties in macroscopic fracture toughness are also discussed.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Engineering, Geological
Mincai Jia, Bo Liu, Jianfeng Xue, Guoqing Ma
Summary: The paper introduces a three-dimensional discrete element-finite difference coupling method and validates its effectiveness in dynamic compaction tests. It is found that dynamic stress propagation and tamper penetration play different roles in soil deformations, and allocating more tamping energy to the bearing capacity mechanism can improve the efficiency of dynamic compaction.
Article
Computer Science, Interdisciplinary Applications
Yue Chen, Mark B. Jaksa, Yien-Lik Kuo, Brendan T. Scott
Summary: The study validates the numerical scale model against field data and suggests that ground settlement is a better indicator than pressure for assessing the number of RDC passes.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Chemistry, Multidisciplinary
Zhitao Ma, Keyu Lu, Daifu Song, Wenhu Liu, Yipeng Wang, Shunhai Li
Summary: In this paper, the compaction characteristics and compaction technology of excessively wet silts are studied through theoretical derivation, indoor experiments, numerical simulation, and engineering verification. The Hill contact model is used to simulate the wet silt, and the optimal compaction process is obtained under the optimal moisture content through on-site engineering tests.
APPLIED SCIENCES-BASEL
(2023)
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
Geochemistry & Geophysics
Lucille Carbillet, Michael J. J. Heap, Patrick Baud, Fabian B. B. Wadsworth, Thierry Reuschle
Summary: The modes of formation of clastic rocks result in a wide variety of microstructures. The influence of grain size distribution on the mechanical behavior of porous rocks is important and not yet fully understood. Experimental studies on synthetic samples show that polydisperse samples have a more progressive onset of grain crushing at lower pressure, and require lower stress to reach inelastic compaction compared to monodisperse samples. Microstructural observations reveal that compaction bands develop in monomodal polydisperse samples while delocalized cataclasis develop in bimodal polydisperse samples.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Construction & Building Technology
Yang Liu, Zhendong Qian, Yuming Yang, Minghui Gong, Qibo Huang, Xiangfei Zhang
Summary: This study investigates the mutual effect of mixture segregation and compaction in EAM deck pavement, finding that lowly cured EAM is more prone to segregation, compaction frequency affects the degree of segregation, and initial vertical segregation of loose EAM has a negative impact on compaction quality. These findings provide insights for reducing mixture segregation and improving compaction quality in EAM deck pavement.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Stewart A. Silling
Summary: A reduced order, nonlocal model is proposed for the contact force between initially spherical particles under compression. The model is calibrated using detailed three-dimensional peridynamic simulations of single grains under compressive loading and takes into account large deformation and fracture. The model is then applied to test data on the compaction of microcrystalline cellulose bulk powder.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Multidisciplinary Sciences
Yipin Su, Davide Riccobelli, Yingjie Chen, Weiqiu Chen, Pasquale Ciarletta
Summary: In this paper, we investigate the nonlinear deformation and morphological transitions of layered dielectric elastomer balloons in response to applied voltage and pressure. We propose a mathematical theory of nonlinear electro-elasticity and study the onsets of morphological transitions using the surface impedance matrix method. Finite-element numerical simulations are used to analyze the nonlinear evolution of bifurcated branches. Our findings suggest the possibility of designing tunable DE spheres for applications in soft robotics and mechanical actuators.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Mathematics, Interdisciplinary Applications
Pengfei Zhang, Chao Yang
Summary: This study proposes a more general finite difference equation to investigate the numerical stability of the dynamic relaxation strategy in structural analysis. It reveals that the first minor of the tangent stiffness matrix is always negative once snap back occurs, resulting in unconditional instability of the numerical scheme.
COMPUTATIONAL MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
David Cantor, Carlos Ovalle
Summary: We used a discrete-element approach to study the behavior of loose cemented particle assemblies under isotropic compression and biaxial shearing. The results show that the solid fraction evolves nonlinearly with pressure, which is influenced by the evolution of granular connectivity and the collapse of pores. The poral space is characterized by the probability of void size number and volume distribution, and surprisingly, can contain voids as large as 30 times the average particle size. Under steady flow, the shear strength exhibits a nonlinear relationship with the level of cementation. For cementation strengths below the confining pressure, the cementation between particles has little effect on the macroscopic friction angle. However, for higher levels of cementation, there is a rapid increase in the macroscopic friction despite a decrease in grain connectivity. The macroscopic cohesion is small compared to the interparticle bonding strength in highly cemented samples. The increase in macroscopic strength depends on the anisotropy of contact forces, despite a homogeneous distribution of contact orientations and lower connectivity in highly cemented samples.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yue Chen, Mark B. Jaksa, Brendan T. Scott, Yien-Lik Kuo
Summary: This paper presents a combined FEM-DEM model to investigate the behavior of a 1:13 scale 3-sided roller. The numerical results are compared with field observations and show good agreement. The study also examines the influence of the twin modules of the roller and suggests avoiding using the total weight of the roller to predict the energy imparted to the ground and the depth of influence.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Instruments & Instrumentation
Feng Chen, Ning Wang, Tao Ma
Summary: A meso-scale mechanical analysis approach was used to investigate the dynamic responses of smart aggregate in cold recycled asphalt mixtures during gyratory compaction. The results showed that smart aggregate is an effective method to monitor the contact force and rotation variation between the aggregates, and the changes in the mechanical and physical properties of the mixtures can be characterized by the monitoring results of smart aggregate. Additionally, the results of discrete element method (DEM) analyses revealed the influence mechanism of the effect of coarse aggregate content on smart aggregate monitoring results.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Chemical
Fei Wang, Yrjo J. Huang
Summary: This study investigates the process of granular compaction and highlights the significant impact of wall effect and gravity on particle arrangement. Increasing gravity can accelerate the crystallization process, while shear force between particles may slow it down.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Mathematics
Teng Man
Summary: This paper proposes a simple mathematical model to predict the compaction of asphalt mixtures, considering the viscous properties of the asphalt binder and grain size distributions of the aggregates. The model is calibrated and validated with Superpave gyratory compaction tests, showing good predictions for the experiments and suggesting its potential for enhancing the design of asphalt mixtures.
Article
Geochemistry & Geophysics
Tao Zhao, Giovanni Battista Crosta, Giuseppe Dattola, Stefano Utili
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Computer Science, Interdisciplinary Applications
Francesca Ceccato, Irene Redaelli, Claudio di Prisco, Paolo Simonini
COMPUTERS AND GEOTECHNICS
(2018)
Article
Engineering, Geological
Francesco Calvetti, Claudio di Prisco, Irene Redaelli, Anna Sganzerla, Emmanouil Vairaktaris
Article
Engineering, Geological
Irene Redaelli, Claudio di Prisco
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2019)
Article
Engineering, Geological
Giulia Macaro, Stefano Utili, Christopher M. Martin
Summary: Realistic modelling of transverse pipe-soil interaction is crucial for predicting the behavior of untrenched offshore pipelines. This paper uses the DEM method to study the behavior of a partially embedded pipe segment in sand, providing quantitative predictions of vertical and horizontal forces, displacement trajectory, and qualitative insights into soil failure mechanisms.
Article
Mechanics
Dalila Vescovi, Irene Redaelli, Claudio di Prisco
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Irene Redaelli, Claudio di Prisco
Summary: This paper investigates the mechanical behavior of dry granular materials under evolving and steady conditions, analyzing the role of strain rate, void ratio, and imposed pressure. The aim is to obtain numerical data useful for defining constitutive relationships capable of reproducing solid-to-fluid phase transitions. Novelty lies in the type of loading tests performed, inspired by flowing granular masses, and the interpretation of results based on state variables and energy evolution to highlight phase transition processes.
Article
Computer Science, Interdisciplinary Applications
Vasileios Angelidakis, Sadegh Nadimi, Stefano Utili
Summary: The research introduces a code that characterizes the shape of three-dimensional particles, allowing for efficient processing of irregular particles in large samples and generating simplified particle geometries for numerical simulations to characterize the mechanical behavior of particulate assemblies.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Engineering, Geological
Irene Redaelli, Claudio di Prisco, Francesco Calvetti
Summary: The study emphasizes the importance of assessing the time evolution of impact force exerted by dry flowing masses on rigid obstacles for dynamic design of sheltering structures and vulnerability evaluation of existing structures. A physically based force-time function is proposed to correlate local information with macroscopic response, providing insight into the impact process and factors influencing impact force-time evolution.
Article
Computer Science, Software Engineering
Vasileios Angelidakis, Sadegh Nadimi, Masahide Otsubo, Stefano Utili
Summary: This study focuses on the role of particle shape in the mechanical and rheological behavior of particulate and granular materials. It introduces a unified framework for generating clumps or clusters to approximate particle morphology, along with a novel generation technique. The effects of clump-generation techniques on granular assemblies' mechanical behavior are investigated through triaxial compression tests.
Article
Engineering, Geological
Yara Barbosa Franco, Stefano Utili, Jefferson Lins Da Silva
Summary: A semi-analytical method has been developed to consider the contribution of the facing element in the stability of geosynthetic reinforced soil walls. The analysis reveals that accounting for cohesion and the presence of the facing element can lead to savings in the amount of reinforcement required.
Article
Engineering, Geological
Pietro Marveggio, Irene Redaelli, Claudio di Prisco
Summary: In this paper, phase transition phenomena of granular materials during heating and cooling processes are reproduced using a strain hardening visco-elastic-plastic model based on the critical state concept and kinetic theories of granular gases. The authors emphasize the crucial role of isotropic softening/hardening in the model.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Multidisciplinary Sciences
Chuang Song, Chen Yu, Zhenhong Li, Stefano Utili, Paolo Frattini, Giovanni Crosta, Jianbing Peng
Summary: This study uses satellite radar observations to investigate the triggering and recovery mechanisms of landslides that are accelerated by earthquakes without immediate failures but showing a prolonged response.
NATURE COMMUNICATIONS
(2022)
Proceedings Paper
Mathematics, Applied
Irene Redaelli, Francesca Ceccato, Claudio G. Di Prisco, Paolo Simonini
V INTERNATIONAL CONFERENCE ON PARTICLE-BASED METHODS - FUNDAMENTALS AND APPLICATIONS (PARTICLES 2017)
(2017)
Proceedings Paper
Engineering, Multidisciplinary
Irene Redaelli, Francesca Ceccato, Claudio Di Prisco, Paolo Simonini
PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON THE MATERIAL POINT METHOD (MPM 2017)
(2017)
