|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Modified virtual internal bond model based on deformable Voronoi particles显示文摘In last time,the series of virtual internal bond model was proposed for solving rock mechanics problems.In these models,the rock continuum is considered as a structure of discrete particles connected by normal and shear springs(bonds).It is well announced that the normal springs structure corresponds to a linear elastic solid with a fixed Poisson ratio,namely,0.25 for threedimensional cases.So the shear springs used to represent the diversity of the Poisson ratio.However,the shearing force calculation is not rotationally invariant and it produce difficulties in application of these models for rock mechanics problems with sufficient displacements.In this letter,we proposed the approach to support the diversity of the Poisson ratio that based on usage of deformable Voronoi cells as set of particles.The edges of dual Delaunay tetrahedralization are considered as structure of normal springs(bonds).The movements of particle’s centers lead to deformation of tetrahedrals and as result to deformation of Voronoi cells.For each bond,there are the corresponded dual face of some Voronoi cell.We can consider the normal bond as some beam and in this case,the appropriate face of Voronoi cell will be a cross section of this beam.If during deformation the Voronoi face was expand,then,according Poisson effect,the length of bond should be decrees.The above mechanism was numerically investigated and we shown that it is acceptable for simulation of elastic behavior in 0.1–0.3 interval of Poisson ratio.Unexpected surprise is that proposed approach give possibility to simulate auxetic materials with negative Poisson’s ratio in interval from–0.5 to–0.1. | Oleg Konovalov Shunying Ji Michael Zhuravkov | 2020 | Theoretical & Applied Mechanics Letters2020，10，2： | 1 |
| 2 | Modeling of deformation processes in rock massif in the vicinity of underground goafs considering the formation of discontinuity zones显示文摘The construction of mechanical-mathematical model and numerical method for the deformation processes of rock massifs with goafs and underground structures is very complex and also important task in modern rock mechanics.In this study,the mechanical-mathematical model is developed for rock massif in vicinity of underground goafs considering the internal block-layered structure of the rock massif.A new constitutive model is introduced in this study to describe the negative Poisson’s ratio for the lock-layered structure.Two types of defining equations systems for studying the state of a rock massif taking into account the block-layered structure are described.Finally,several examples are given using the present mechanical-mathematical model. | Michael Zhuravkov Shunying Ji Aleg Kanavalau | 2020 | Theoretical & Applied Mechanics Letters2020，10，2： | 1 |
| 3 | 凹形多面体离散单元的水平集函数接触算法显示文摘多面体模型理论上可构造任意颗粒形态,然而受单元接触算法的限制,仅用于凸形颗粒材料的离散元模拟。对于具有凹形特征的多面体单元,单个接触点的搜索算法难以精确计算单元间的作用力。考虑多面体单元间存在单个或多个接触点的计算特性,本文发展了适用于凸形和凹形多面体颗粒材料的水平集函数接触算法。该方法通过点-三角形单元距离计算方法和奇-偶数判定方法建立多面体单元的零水平集函数和空间水平集函数,并对水平集函数进行三线性插值,可得到多面体单元间的单个或多个接触点。为检验水平集函数接触算法的可靠性,对球形和凹形多面体颗粒材料的堆积和倒塌过程进行离散元模拟,并分析颗粒形状对堆积密度和休止角的影响规律。 | 王嗣强 薛一桢 Michael Zhuravkov 季顺迎 | 2022 | 计算力学学报2022，39，3： | 1 |
| 4 | Introduction to the Special Issue on Computational Mechanics of Granular Materials and its Engineering Applications显示文摘1 Introduction The purpose of this special issue“Computational Mechanics of Granular Materials and its Engineering Applications”is to introduce the latest research progress in computational mechanics and engineering applications of granular materials,with particular emphasis on the theoretical constructions of arbitrarily shaped particles,flow pattern transitions,bond-fracture model,neural network algorithm,CFD-DEM coupled method,and coarse-graining model,and to improve our understanding of the physical and mechanical properties of granular systems from the perspective of practical engineering applications. | Shunying Ji Michael Zhuravkov Zongyan Zhou Yuntian Feng | 2022 | Computer Modeling in Engineering & Sciences2022，，7： | 0 |
| 5 | 岩体复杂极限状态准则显示文摘在对岩体的应力-应变状态进行评估时,应当采用考虑岩体物理特性的准则体系,而非一个特定的破坏准则.为此,本文提出了一个用以预测岩体极限状态及其由连续向不连续状态潜在转变的复杂极限状态准则.该准则具有通用的极限状态标准,可用于评估任何岩体结构附近的极限状态.本文主要是建立一个能够准确区分岩体准连续状态和非连续状态的准则,并可进一步用于地下结构附近岩体地质力学数值模拟的连续介质方法(如有限元法)及离散介质方法(如离散元方法或相应的离散单元法).以上的复杂极限状态准则在对单个采矿开挖区附近岩体强度/破坏评估的经典应用中得到证实.本文研究工作不仅可用于确定地下结构附近岩体的潜在破坏区域,还可用于开发基于FEM-DEM耦合数值方法的CAE专业软件. | Michael Zhuravkov Siarhei Lapatsin 季顺迎 | 2023 | Acta Mechanica Sinica2023，39，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员