Article
Environmental Sciences
Cheng-yu Miao, Ming Jiang, Zhi-hu Li, Xiao-ming Sun, Tong Zhang, Yong Zhang, Jin-kun Yang, Chao Ren, Peng Song
Summary: This study uses RFPA software to establish a calculation model of constant resistance and large deformation (CRLD) anchorages and analyzes the effects of different support methods and pre-stress levels on rockburst. The research finds that CRLD anchor support has several advantages in rockburst control, such as uniform stress distribution, uniform distribution of plastic zones, less noticeable damage to the tunnel, and effective control of displacement. Based on these findings, a comprehensive control system is proposed that combines high-prestress CRLD anchor support and the combination of long and short anchorages to enhance the integrity of the surrounding rock and reduce the incidence of rockburst disasters.
JOURNAL OF MOUNTAIN SCIENCE
(2023)
Article
Computer Science, Interdisciplinary Applications
Yongyong Cai, Jingrun Chen, Cheng Wang, Changjian Xie
Summary: In this study, a second order accurate numerical scheme is proposed and implemented for the simulation of magnetization dynamics in ferromagnetic materials with large damping parameters. The method demonstrates high efficiency and stability.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Construction & Building Technology
Wei Ming, Xiaojie Yang, Yuefeng Pan, Yadong Mao, Xiang Wang, Manchao He, Zhigang Tao
Summary: Bolt/cable support technology is widely used in rock engineering protection to enhance stability and safety by limiting large deformations of surrounding rocks and improving mechanical properties. This paper studies the properties of a negative Poisson's ratio anchor cable and proposes an in-situ blasting test to simulate the impact of a nuclear explosion. Numerical modeling was utilized to validate the performance of the anchor cable support system under high vibration conditions. The findings show that the cavern supported by the negative Poisson's ratio anchor cable exhibits better stability under strong impact and vibration compared to anchor bolt support.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Xiaoming Sun, Li Cui, Yong Zhang, Lei Wang, Zhenmin Qi
Summary: This study investigates the mechanical properties of pre-cracked rock on the surface of roadways using a new type of CRLD cable. The PFC software was used to evaluate the effect of a pallet on the characteristics of the CRLD cable. The findings show that the pallet's constant resistance support prevents the formation of new cracks and improves the integrity of the rock mass. Additionally, the Mori-Tanaka method accurately describes the influence of pre-crack number on the strength of anchored rock.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Construction & Building Technology
Xiaoming Sun, Li Cui, Manchao He, Qi Wang, Yong Zhang
Summary: This study introduces a new type of cable, called constant resistance and large deformation (CRLD) cable, which has a high elongation rate and energy absorption capacity. Compared to traditional high-strength (HS) cables, the CRLD cable shows a constant resistance stage and a higher level of energy absorption. The mechanical performance evaluation index, static toughness UT, of the CRLD cable is significantly higher than that of HS cables and another widely used He cable. Applying the CRLD cable as a support in a roadway significantly reduces surrounding rock deformation and ensures stability.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Mathematics, Applied
Jing Guo, Cheng Wang, Steven M. Wise, Xingye Yue
Summary: In this paper, an error analysis for a second order accurate numerical scheme for the 2-D and 3-D Cahn-Hilliard equation is presented, with an improved convergence constant that depends on 1/epsilon only in a polynomial order. The study overcomes a well-known difficulty by applying a spectrum estimate for the linearized Cahn-Hilliard operator and performing a detailed numerical analysis.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Multidisciplinary Sciences
Lijuan Zhao, Haining Zhang, Feng Gao, Liguo Han, Man Ge
Summary: The development of intelligent and unmanned coal mining has raised higher requirements for the service life and dynamic reliability of shearer cables. To address the complexity of hosting conditions and dynamic characteristics in different towing systems, this study uses an orthotropic elastomer model and combines experimental and finite element methods to calibrate the mechanical parameters of the cables. By constructing a co-simulation model, the dynamic characteristics of the cables in different working areas can be studied, which has important theoretical and engineering significance for cable design and reliability.
Article
Engineering, Multidisciplinary
Peng Zhang, Menglan Duan, Lin Yuan, Jianmin Ma, Jinxin Wang, Jian Tan, Jinjia Wang
Summary: This study aims to solve the large deformation problem of slender beams under follower loads using the Bernoulli-Euler beam element of absolute nodal coordinate formulation. The beam configuration and the Frenet frame are modeled using the second-order approximate function of the beam centerline. The elastic force vector and its tangent stiffness matrix are formulated, and the constraint of adjacent elements is imposed using Lagrange multipliers. The proposed approach is validated through solving benchmark problems of straight and curved beams under different follower loads.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Computer Science, Interdisciplinary Applications
Xi -Wen Zhou, Feng-Tao Liu, Yin-Fu Jin, Zhen-Yu Yin, Cheng-Bo Zhang
Summary: This paper proposes a novel dynamic implicit optimization based smoothed PFEM for solving geotechnical large deformation problems. It is validated that the proposed method offers high accuracy, high efficiency, mesh insensitivity, and is free of volumetric locking.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mathematics, Applied
Shujuan Lu, Tao Xu, Zhaosheng Feng
Summary: In this study, a second-order finite difference scheme is proposed for analyzing a class of space-time variable-order fractional diffusion equation. The scheme is demonstrated to be unconditionally stable and convergent with a convergence order of O(tau(2) + h(2)) under certain conditions, as validated by numerical examples.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2021)
Article
Materials Science, Multidisciplinary
Guiju Duan, Shengjie Zheng, Zhi-Kang Lin, Junrui Jiao, Jianting Liu, Zihan Jiang, Baizhan Xia
Summary: Recently, higher-order topological insulators (HOTIs) have been observed in mechanical systems, providing new possibilities for controlling the propagation of elastic waves. In this study, second-order mechanical topological insulators (SMTIs) implemented by mechanical metamaterials in different lattice structures were systematically investigated. The topological properties of these metamaterials were characterized using topological indices and Wannier centers. Both simulations and experiments confirmed the existence of corner states and edge states in these topological mechanical metamaterials. Interestingly, the number of corner, edge, and bulk states were found to be related to the number of sites located at the corresponding regions. This work presents an inspiring and unified model for studying higher-order topological effects in mechanical systems, and offers a new pathway for designing functional and integrated topological devices.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Geological
Zhigang Tao, Yicong Wang, Mengnan Li, Yong Wang, Wenshuai Han, Xiaojie Yang
Summary: Large deformation cables with constant resistance have superior mechanical characteristics compared to traditional anchor cables and have been successfully applied in geotechnical engineering and tunnel engineering. By establishing finite element analysis models and conducting indoor tests, the reliability of numerical simulation analysis models was verified, providing theoretical basis for the construction of deep mechanics monitoring and early warning systems.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Xiaocong Deng, Kai Wang, Qianqian Li, Zhen Li
Summary: This study proposes a new approach to design second-order nonlinear optical polymer networks through in situ thermal crosslinking. The networks exhibit excellent optical performance and stability after in situ poling and thermal crosslinking.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Engineering, Multidisciplinary
Damin Xia, Xiang Zhang, Caglar Oskay
Summary: In this manuscript, a finite strain formulation of a reduced order computational homogenization model for crystal plasticity is presented. The proposed formulation leverages and generalizes principles of the Eigenstrain-based reduced order homogenization approach. An efficient implementation scheme is proposed to evaluate the multiscale system without recomputing the reduced basis as deformation evolves. The modeling approach demonstrates the ability to capture homogenized and localized behavior as well as texture evolution in single crystal and polycrystal microstructures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Computer Science, Software Engineering
Roberto Andreani, Gabriel Haeser, Leonardo M. Mito, Hector Ramirez, Thiago P. Silveira
Summary: In this paper, a general and geometric approach is proposed for defining a new extension of the constant rank condition to the conic context. The main advantage is that the strong second-order properties of the constant rank condition can be recast in a conic context. Specifically, a second-order necessary optimality condition is obtained that is stronger than the classical one obtained under Robinson's constraint qualification.
MATHEMATICAL PROGRAMMING
(2023)
Article
Engineering, Geological
Z. H. Li, J. Hu, H. X. Zhu, J. L. Feng, M. C. He
Article
Construction & Building Technology
Ma Yankun, He Xueqiu, Li Zhaohua
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2020)
Article
Mechanics
Felix Darve, Francois Nicot, Antoine Wautier, Jiaying Liu
Summary: Granular materials can exhibit two different failure modes: localized mode with shear bands and diffuse mode without macroscopic localized bands. Detailed analysis shows that meso-slip lines and macro-shear bands co-exist at different scales during loading. The study compares and analyzes these two localized patterns to understand why and how meso-slip lines sometimes bifurcate into macro-shear bands.
MECHANICS RESEARCH COMMUNICATIONS
(2021)
Article
Engineering, Geological
Hao Xiong, Zhen-Yu Yin, Francois Nicot, Antoine Wautier, Miot Marie, Felix Darve, Guillaume Veylon, Pierre Philippe
Summary: This paper introduces a novel multi-scale approach for modelling granular column collapse, utilizing a micro-mechanical model and SPH method to successfully simulate the flow of granular column under low water content conditions. The numerical results show good agreement with experimental observations and capture meso-scale behavior.
Article
Computer Science, Interdisciplinary Applications
Luc Sibille, Nadia Benahmed, Felix Darve
Summary: This study investigates the capability of a discrete element model to predict the constitutive response of a soil, showing that the model, calibrated from monotonous drained triaxial compressions, can provide good qualitative and quantitative predictions even for non-rectilinear loading paths or those involving rotation of principal stress axes. The study also emphasizes the importance of simplicity of use and robust validation loading paths for such a modelling framework.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Mojtaba Farahnak, Richard Wan, Mehdi Pouragha, Mahdad Eghbalian, Francois Nicot, Felix Darve
Summary: This paper investigates the effect of an adsorbed water layer on the mechanical behavior of fine-grained wet granular materials, revealing that adsorbed layers can significantly increase interparticle cohesive force and rupture distance, especially under high suction conditions.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Computer Science, Interdisciplinary Applications
A. Wautier, G. Veylon, M. Miot, M. Pouragha, F. Nicot, R. Wan, F. Darve
Summary: The paper highlights the significance of the H-model in geotechnical engineering, which is a micromechanical approach that can effectively capture the mechanical behavior and mesostructures of granular media.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mathematics, Applied
Jean Lerbet, Noel Challamel, Francois Nicot, Felix Darve
Summary: This paper investigates the stability of Hencky chains under kinematic constraints and the behavior as the degrees of freedom approach infinity. The divergence instability load of non-conservative discrete systems under general kinematic constraints is determined by the second-order work criterion. The exact divergence load pn under kinematic constraints can be found using this criterion.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2022)
Article
Mechanics
Sina Massoumi, Noel Challamel, Jean Lerbet, Antoine Wautier, Francois Nicot, Felix Darve
Summary: This study aims to better understand the length scale effects on the bending response of granular beams by investigating a unidimensional discrete granular chain. The bending deformation solutions of the chain asymptotically converge towards the continuum beam model, showing close and eventually coincident results between the granular model and the nonlocal beam model.
Article
Materials Science, Multidisciplinary
Jiaying Liu, Antoine Wautier, Wei Zhou, Francois Nicot, Felix Darve
Summary: The constitutive behaviors of granular materials are affected by particle interactions and geometric arrangements. Understanding the mesoscale properties is crucial for bridging the gap between grain and sample scales. This paper introduces the concept of incremental shear strain chains, which provide a quantitative definition of mesoscale structures. The orientation of shear chains is a material scale property that is independent of boundary conditions, loading paths, and sample densities.
Article
Mechanics
Jiaying Liu, Antoine Wautier, Francois Nicot, Felix Darve, Wei Zhou
Summary: The shear chain concept is used in this study to investigate shear characteristics in granular materials at different scales and to explore the correlations between microscopic and macroscopic shear behaviors. The results show that the orientation of shear bands is influenced by the sample aspect ratio, while the orientation of shear chains only depends on the stress state. It is conjectured that shear bands are formed by a collection of crossing shear chains at the meso scale.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Noel Challamel, Francois Nicot, Antoine Wautier, Felix Darve, Jean Lerbet
Summary: This paper investigates different granular interaction laws used in discrete granular media modeling. It analyzes the properties and applications of these laws and shows that instabilities can occur under large displacements, with discrepancies between models increasing during deformation.
JOURNAL OF ENGINEERING MECHANICS
(2022)
Article
Mathematics, Applied
Sina Massoumi, Noel Challamel, Jean Lerbet, Antoine Wautier, Francois Nicot, Felix Darve
Summary: This paper focuses on studying shear vibration modes of one-dimensional granular microstructured beams using a discrete Cosserat model. The dynamic response of the beams with various boundary conditions is analyzed by solving an exact discrete eigenvalue problem. It is found that for a large number of grains, the dynamic behavior of the beams converges to a Bresse-Timoshenko continuum beam model.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Mathematics, Applied
Jean Lerbet, Noel Challamel, Francois Nicot, Felix Darve
Summary: This paper presents an explicit and coordinate-free formulation of incremental discrete mechanics in potentially non-integrable hypoelasticity. It develops a general framework that treats hypoelasticity as an Ehresmann connection on the cotangent bundle T*M, distinguishing between weak or integrable incremental evolutions and strong or non-integrable incremental evolutions based on the nature of the hypoelastic constitutive law. The geometric structure of the double tangent bundle TT*M is utilized to obtain the geometric counterpart kappa of the tangent stiffness matrix. The validity of the incremental evolution is established under specific conditions in TT*M, and a four-grains hypoelastic granular system is used to illustrate the general results in detail.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Materials Science, Multidisciplinary
F. Nicot, X. Wang, A. Wautier, R. Wan, F. Darve
Summary: This paper investigates the phenomenon of shear banding in granular materials by connecting it to the minimum entropy production theorem and the second-order work theory. The analysis shows that a bifurcation in the failure behavior of granular materials under loading can be thermodynamically interpreted, and it is verified through discrete element simulations. The study suggests a new interpretation of shear banding as the emergence of ordered dissipative structures in nonequilibrium thermodynamics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
