Article
Engineering, Multidisciplinary
Tao Zhou, Ying Chen, Ruitao Tang, Qi-Qi Fu, Liushun Ye, Haibin Zhu, Xuecheng Zhang, Haoran Fu
Summary: This paper investigates the dynamic buckling behavior of stiff films using an implicit dynamic element-free Galerkin method based on the Strain-Rotation decomposition theorem. The study validates the numerical stability and accuracy of the proposed method through convergence and comparison studies, while also analyzing the influences of compression loading rate and thickness to length ratio on the buckling/post-buckling of stiff thin films.Overall, the research provides an effective approach for the engineering computation of flexible electronic technology and contributes to the advancement of the field.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Mechanics
Jalal Torabi, Jarkko Niiranen, Reza Ansari
Summary: Nonlinear plate bending within Mindlin's strain gradient elasticity theory is investigated through comparison of bending results from geometrically nonlinear 3D theory and Reissner-Mindlin plate theory within SGT. Various finite element methods and discretization strategies are employed for model comparisons, highlighting differences between the 3D and FSDT models.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Mathematics, Applied
Bo-Hua Sun
Summary: The computation of rotation tensor is crucial in analyzing deformable bodies. This paper introduces an explicit expression for the rotation tensor of the deformation gradient, establishing a relationship between the exponential mapping and deformation. The Maple code provided makes it easier to apply the formulation to general 2D problems.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Green & Sustainable Science & Technology
Zhen Wu, Huiwen Zhang
Summary: The physical characteristics of blocks have a significant impact on the migration and deposition in landslides. By comparing the velocity and location changes of triangular and square blocks, it was found that the shape and physical properties of the blocks affect their migration. The simulation results indicate that blocks with different numbers of edges and surfaces have complex trajectories due to contact frequency and mobility, and the physical properties of the blocks could be one of the factors that ultimately change the displacement of landslides.
Article
Engineering, Geological
Yongtao Yang, Dongdong Xu, Hong Zheng, Zhijun Wu, Da Huang
Summary: The recently proposed 3D-CPDDA method, which is based on three-dimensional contact potential, has been further improved for wave propagation problems in rock masses. By incorporating a viscous non-reflecting boundary and a force input method, the modified 3D-CPDDA method accurately simulates wave propagation in rock masses.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Xi Wang, Wei Wu, Hehua Zhu, Hong Zhang
Summary: Three-dimensional discontinuous deformation analysis (3D-DDA) is a powerful deformable discrete element method, but its application is limited by constitutive models and accurate integration on the polygonal boundaries of 3D blocks. This study addresses these limitations by reformulating submatrices and specifying an accurate integral method, demonstrating the advantages of face constraints.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Civil
Dongxu Du, Wei Sun, Xianfei Yan, Kunpeng Xu
Summary: This study investigates the nonlinear vibration behaviors of a rotating hard-coating cylindrical shell under radial harmonic excitations, considering the strain dependences of the storage and loss moduli. The nonlinear equations of motion are established using the Rayleigh-Ritz method and high-order polynomials to accurately characterize strain dependences. By improving the Newton-Raphson method, a specified iteration algorithm is developed to solve the nonlinear equations, validating the proposed model through comparison studies. The effects of rotating speed and excitation amplitude on the nonlinear vibration characteristics of the rotating hard-coating cylindrical shell are also examined.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Geological
Jia-Le Li, Gao-Feng Zhao
Summary: In this work, a discrete digital image correlation (DDIC) method is introduced to address the challenges of discontinuities and large deformations in small-scale tests on rock. The effectiveness and reliability of the proposed method are verified through various experiments, demonstrating its potential as a promising solution in rock mechanics studies.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Shiyue Tang, Kaiqi Ye, Hongyu Zhang
Summary: This study reports a centimeter-long organic crystal that exhibits two-dimensional elastic bending and reconfigurable plastic twisting deformations. The crystal can be bent elastically at both room temperature and ultralow temperatures, and can be manually twisted and reconfigured into different structures. By integrating low-temperature resistance and reconfigurable plastic deformations into one organic crystal, it expands the application perspectives of crystal flexibility.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Geological
Hongyun Fan, Liping Li, Hongliang Liu, Jian Ni, Shuai Cheng, Hao Zhou
Summary: This study investigates the effects of time step and contact spring stiffness on the results of 3D.DDA method through theoretical analysis and numerical simulations. The reasonable value range and optimal value range of time step and contact spring stiffness are determined, and their effectiveness is verified through experiments.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Acoustics
Yanxun Zhou, Yimin Zhang, Guo Yao
Summary: This article conducts a nonlinear forced vibration analysis on a rotating three-dimensional tapered cantilever beam subjected to a uniformly distributed load. By establishing nonlinear partial motion equations using Hamilton's principle and discretizing them with Galerkin's procedure, the dynamic response of the beam is obtained. Results show that the fundamental natural frequency increases with the increase of taper ratio, radius of hub, and rotating velocity, while the nonlinearity and vibration amplitude of the rotating beam intensify with adjustments in taper ratio, excitation amplitude, rotating velocity, and radius of hub.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Engineering, Aerospace
Ariel Drachinsky, Maxim Freydin, Daniella E. Raveh
Summary: This paper presents a three-dimensional strain-to-displacement transformation method suitable for large deformations, which is validated through numerical and experimental tests.
Article
Computer Science, Interdisciplinary Applications
Penglin Li, Jian-Hua Yin, Zhen-Yu Yin, Zejian Chen
Summary: This paper develops a one-dimensional finite strain consolidation model to consider the creep characteristics of soft clay during the self-weight consolidation process. The model considers Darcian and non-Darcian flow, nonlinear compressibility and permeability of soft clays with varying water content. The simulation results of three case studies show that the model can capture the self-weight consolidation process well with more realistic consideration of the creep feature of clays compared to previous models.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Geological
Yota Togashi, Takanobu Imano, Masahiko Osada, Koichi Hosoda, Koji Ogawa
Summary: This study investigates the deformation behavior of Japanese tuff due to drying and continuous moisture-content variation. The results show anisotropic deformations with dominant normal strain in the orientation perpendicular to the bedding plane, shear strain, and principal strain rotation due to moisture variation. The study reveals that the hardest and softest orientations of tuff continuously alternate due to moisture variation.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Mathematics, Applied
Xinhui Wu, Jesse Chan
Summary: A high-order entropy stable discontinuous Galerkin method has been proposed for addressing nonlinear conservation laws on multi-dimensional domains and networks, using treatments of multi-dimensional interfaces and network junctions to maintain entropy stability when coupling entropy stable discretizations. Numerical experiments confirm the stability of the schemes and show the accuracy of junction treatments in comparisons with fully 2D implementations.
JOURNAL OF SCIENTIFIC COMPUTING
(2021)
Article
Engineering, Multidisciplinary
Shiwei Zhao, Zhengshou Lai, Jidong Zhao
Summary: This article presents a novel approach to accelerate particle-based simulations by leveraging ray tracing cores in addition to CUDA cores on RTX GPUs. A new, general-purpose RT-based neighbor search algorithm is proposed and benchmarked with a prevailing cell-based one. The study demonstrates that the RT-based simulations are 10%-60% faster than the cell-based ones.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Hao Chen, Shiwei Zhao, Jidong Zhao, Xiaowen Zhou
Summary: This study proposes a generalized contact scheme based on a hybrid scheme of material point method (MPM) and discrete element method (DEM) to model multi-body and multi-material interactions. The scheme contains two novel features of particle-particle and particle-structure contact schemes guided by a DEM contact model. It demonstrates that the generalized contact scheme can flexibly capture the mechanical responses of multi-body and multi-material systems in MPM.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Weijian Liang, Jidong Zhao, Huanran Wu, Kenichi Soga
Summary: We propose a multiscale, multiphysics approach that combines two-phase material point method (MPM) with discrete element method (DEM) (MPM-DEM) to simulate the hydro-mechanical coupling responses of saturated granular media under different loading conditions. The proposed approach is validated and then used to simulate various engineering problems, demonstrating its power and versatility in capturing the complicated interactions exhibited in saturated granular media. Furthermore, connections between macroscopic observations and microstructural mechanisms are established to provide multiscale insights into the dynamic responses of saturated sand.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Geological
Shuai Huang, Linchong Huang, Zhengshou Lai, Jidong Zhao
Summary: This study presents a numerical modeling of coral sand using the discrete element method, taking into account the irregular shape and intraparticle voids. The developed model is calibrated and validated against laboratory tests, showing good accuracy and validity. The performance of two different particle models, spherical harmonics and level set, is also compared, providing a useful reference for practical applications.
ENGINEERING GEOLOGY
(2023)
Article
Engineering, Geological
Yong Kong, Xingyue Li, Jidong Zhao, Mingfu Guan
Summary: This study uses a physics-based coupled computational fluid dynamics and discrete-element method (CFD-DEM) to simulate a flexible ring-net barrier and model a debris flow. The numerical predictions show reasonable consistency with large-scale experiments. Systematic simulations are performed to examine the load-deflection mechanisms and quantify the load-deflection modes. The study improves understanding for practical design of flexible barriers in mitigating debris flows.
Article
Engineering, Multidisciplinary
Huo Fan, Duruo Huang, Gang Wang
Summary: This study proposes a set of new weight functions that can efficiently generate an appropriate, diagonally lumped mass matrix (LMM) based on classical triangular elements. The study also proves that these new elements are complete and consistent, ensuring the convergence of the numerical solution. Modal and forced/free vibration analyses are conducted to verify the accuracy and validation of the proposed LMM.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Mechanical
Tongming Qu, Shaoheng Guan, Y. T. Feng, Gang Ma, Wei Zhou, Jidong Zhao
Summary: This study aims to develop a deep active learning strategy to improve the data-driven constitutive modelling of granular materials. The results confirm the importance of active learning in this field and suggest its potential application in other data-centric applications in various science and engineering fields.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Manufacturing
Tao Yu, Jidong Zhao
Summary: The key to quality control in laser powder bed fusion (L-PBF) is to reduce porosity in the built parts. However, understanding the mechanisms of keyhole pore evolution, including generation, collapse, and splitting, and the role of metal-vapor condensation, remains challenging. This study uses computational tools to reproduce observations and identify the critical physics underlying keyhole instability and pore generation. The results show that keyhole and pore fluctuation are influenced by vapor condensation, liquid vortex, recoil pressure, surface tension, and keyhole morphology. The findings also suggest that vapor condensation is a major mechanism leading to pore collapse and splitting. An optimization strategy based on condensation rate is proposed to eliminate keyhole pores during laser melting.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
Zhengshou Lai, Jidong Zhao, Shiwei Zhao, Linchong Huang
Summary: This paper presents an improved framework of the immersed boundary method (IBM)-based fully resolved computational fluid dynamics (CFD) and discrete element method (DEM), emphasizing on irregular-shaped particles and their implications to particle-fluid interactions. The proposed SDF-CFD-DEM framework leverages signed distance field (SDF) as a generic interface for universal modeling of arbitrarily shaped particles interacting with multiphase fluids. It is validated and demonstrated with examples including particle settling, drafting-kissing-tumbling, immersed granular collapse, and mudflow, showing good accuracy, robustness, and potential for efficient computational modeling of granular flows with arbitrary-shaped particles.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Mathematics, Applied
Huo Fan
Summary: The volume-coordinate system (VCS) is crucial in finite element method (FEM). Currently, the number of coordinate components in all VCSs is equal to the number of faces of polyhedral elements. This study presents a new 3-component VCS based on hexahedron, which can be applied to degenerated solids such as tetrahedron and 5-surface solids. Unlike previous VCS, the new VCS is shape-independent and combines the advantages of local natural coordinate system and Cartesian coordinate system.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Mechanics
Y. T. Li, N. Guo, Z. X. Yang, J. D. Zhao
Summary: This paper presents a numerical study on the behavior of suspensions of non-Brownian grains in a Couette flow. The results show that both the inertia and the grain shape affect the interactions between grains and the fluid, contributing to the overall shear stress and rheology of the suspension. The study also reveals the presence of grain layering near the boundary walls, which becomes more pronounced with higher solid concentration and inertia, and increased non-circularity in grain shape. The correlation between suspension viscosity and grain microstructure and kinematics is also investigated.
Review
Physics, Applied
Jidong Zhao, Shiwei Zhao, Stefan Luding
Summary: This Technical Review provides an overview of computational modeling of granular matter, focusing on the role of particle shape and future challenges.
NATURE REVIEWS PHYSICS
(2023)
Article
Engineering, Multidisciplinary
Changyi Yang, Fan Zhu, Jidong Zhao
Summary: This paper presents a novel computational approach for modelling fluid-driven fracturing in quasi-brittle solids using peridynamics. The approach combines total-Lagrangian formulation and semi-Lagrangian formulation to solve the Navier-Stokes equation and quantify the forces at the fluid-solid interface using a non-local differential operator. The proposed approach offers a unified peridynamics-based framework that enables simulations of a wide range of fluid-driven fracturing problems in solids and has been validated through various classic problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Engineering, Geological
Ke Shi, Fan Zhu, Jidong Zhao
Summary: This study uses a multiscale computational approach to simulate the shearing behavior of crushable granular sand at critical state and analyzes its characteristics. The results show that the critical state has unique features for crushable granular sand, including critical state stress ratio, void ratio, breakage index, and shape descriptors.
Article
Engineering, Multidisciplinary
Jidu Yu, Jidong Zhao, Weijian Liang, Shiwei Zhao
Summary: In this study, a stabilized material point method (MPM) is developed for modeling the thermo-hydro-mechanical (THM) response of porous media undergoing large deformations. A novel staggered solution scheme is proposed, and the validity and efficiency of the method are demonstrated through benchmark problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Computer Science, Interdisciplinary Applications
Yinghao Deng, Yang Xia, Di Wang, Yan Jin
Summary: This study investigates the mechanism of hydraulic fracture propagation in laminated shale, develops a numerical solver, and validates the effectiveness of the method through simulation experiments. The study also examines the influence of the interaction between hydraulic fractures and weak interfaces on the mechanical properties of shale.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhichao Zhang, Mingfei Feng, Guangshuo Zhou, Zhenglong Xu
Summary: A thermodynamic constitutive model for structured and destructured clays is proposed in this paper. The model includes state-dependent relations of hyperelasticity and plasticity without the concept of yielding surface. The proposed model captures the couplings between elasticity and plasticity and the effects of bonding structure.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Deze Yang, Xihua Chu
Summary: Creep and stress relaxation behaviors in granular materials are influenced by the time-dependent changes in their microstructure, with particle shape playing a significant role. However, the effects of particle shape on these behaviors are still not well understood. In this study, 3D DEM models incorporating the rate process theory and superellipsoids are used to simulate creep and stress relaxation in granular samples with different aspect ratios and blockiness. The results show that both aspect ratio and blockiness have a significant influence on creep and stress relaxation, with aspect ratio affecting creep through contact force ratio and blockiness affecting stress relaxation through variation in normal contact force anisotropy. These findings provide insights into the effects of particle shape on creep and stress relaxation in granular assemblies.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shahab Amanat, Kourosh Gholami, Reza Rafiee-Dehkharghani, Dipanshu Bansal
Summary: This paper investigates the optimal design of wave barriers using the modified non-dominated sorting genetic algorithm-II (NSGA-II) and the Bloch-Floquet theory. The aim is to find the optimal design of plane wave barriers with a wide bandgap at a low-frequency range and low construction cost. The study develops a modified NSGA-II algorithm to determine the optimal arrangement of concrete in wave barrier unit cells. The performance of the optimal barriers is examined through finite element simulation and their efficacy in attenuating plane S-waves is verified.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yanlin Su, Guoqing Cai, Fengjie Yin, Yepeng Shan, Annan Zhou
Summary: This paper presents a novel elastic-viscoplastic constitutive model that takes into account particle breakage to reproduce the time-dependent behavior of coarse-grained soil. The model integrates the Unified Hardening (UH) model, the elastic-viscoplastic (EVP) model, and the overstress theory. The relationship between particle breakage and loading rate is established, and state variables associated with the critical state of coarse-grained soil are derived to consider both time and particle breakage. A three-dimensional elastic-viscoplastic constitutive model is constructed by combining a one-dimensional viscoplastic hardening parameter with a secondary consolidation coefficient considering particle breakage. The proposed model requires 19 parameters and effectively describes the influence of time-dependency and particle breakage on the shear, dilatancy, and compression behaviors of coarse-grained soil with different confining pressures or initial void ratios. Experimental data comparisons validate the model's ability to replicate the time-dependent behavior of coarse-grained soil.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shichao Zhang, Yaqiong Wang, Qidong Gao, Xiaobo Ma, Haixiao Zhou, Zhifeng Wang
Summary: Accurately evaluating and predicting ground settlement during tunnel excavation is essential for ensuring tunnel stability. This study conducted a probabilistic analysis of ground settlement under uncertain soil properties. The results demonstrate that spatially variable soils significantly influence the ground settlement in the vertical direction.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Xu Zhang, Bin Luo, Youjun Xu, Zhiwen Yang
Summary: This paper presents an analytical solution for horizontal displacements induced by small radius curve shield tunneling. The formula is derived based on the image method and Mindlin solution, considering additional thrust, frictional resistance, ground loss, and grouting pressure. The solution is validated with on-site data, demonstrating its reliability and providing a new approach for predicting and controlling stratum horizontal displacements in curve shield tunneling. The study finds that ground loss has the most significant influence on displacements, and soil closer to the tunnel exhibits larger horizontal displacements.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jian-Hong Wan, Ali Zaoui
Summary: Ground vibrations during earthquakes can cause soil strength loss and structural damage. Rubber-soil mixtures (RSM) have shown promise in reducing residual ground deformation. This study used molecular dynamics simulations to investigate the friction behavior of the rubber-clay interface in RSM systems. The results revealed a direct correlation between normal stress and friction force, with denser soil systems exhibiting higher friction forces.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Hongying Wang, Qiang Zhang, Peinan Wu, Yanjing Li, Lijun Han, Guilei Han
Summary: In addition to the Mohr-Coulomb and Hoek-Brown criteria, other nonlinear functions are used to describe the plastic response of rock mass. This paper derived the equivalent cohesive strength, frictional angle, and dilatancy angle for nonlinear yield and plastic flow rock masses. The solution for a circular tunnel in any nonlinear yield and plastic flow rock masses was derived and verified using a numerical procedure. The analysis of strain-softening rock masses under two assumed nonlinear yield criteria was also studied.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Zhijun Wu, You Wu, Lei Weng, Mengyi Li, Zhiyang Wang, Zhaofei Chu
Summary: This study proposed a machine learning approach to predict the uniaxial compression strength (UCS) and elastic modulus (E) of rocks. By measuring meso-mechanical parameters and developing grain-based models, a database with 225 groups of data was established for prediction models. The optimized kernel ridge regression (KRR) and gaussian process regression (GPR) models achieved excellent performance in predicting UCS and E.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mingjun Zhou, Zhenming Shi, Chong Peng, Ming Peng, Kahlil Fredrick E. Cui, Bo Li, Limin Zhang, Gordon G. D. Zhou
Summary: In this paper, the erosion and deposition processes during overtopping dam breaching are simulated using a novel method (ED-SPH). The proposed model is able to capture the complex behaviors of dam soil erosion, entrainment, and depositions. Soil deposition hinders particle movement and reduces water velocity at the water-soil interface.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
C. Chavez-Negrete, F. J. Dominguez-Mota, R. Roman-Gutierrez
Summary: To accurately simulate groundwater flow in porous layered media, it is important to consider all environmental factors and use a generalized finite differences scheme as a meshless method for spatial discretization. This approach ensures robustness and accuracy of the numerical solution.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Shuairun Zhu, Lulu Zhang, Lizhou Wu, Lin Tan, Haolong Chen
Summary: This paper investigates the effectiveness of the cascadic multigrid method applied to the improved Picard iteration method for solving nonlinear problems in deforming variably saturated porous media. Two improved Picard iteration methods are proposed, and their effectiveness is verified through numerical examples. The results show that the improved methods have faster convergence and higher computational efficiency compared to the classical method.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Yuan Cao, Yan-Guo Zhou, Kyohei Ueda, Yun-Min Chen
Summary: Investigated shear stress responses of enclosed soil in deep soil mixing (DSM) grid-improved ground, and revealed the characteristics of the waist effect and mathematical model for shear stress reduction ratio.
COMPUTERS AND GEOTECHNICS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jinfan Chen, Zhihong Zhao, Jintong Zhang
Summary: This study develops data-driven criteria to estimate the peak shear strength (PSS) of rock fractures, considering the effects of surface roughness features. A high-quality dataset is created using particle-based discrete element method and diamond-square algorithm. Tree-based models and convolutional neural network are trained to predict the PSS of rock fractures, and their reliability is verified using experimental data.
COMPUTERS AND GEOTECHNICS
(2024)
