scholarly journals Numerical Analysis of Ice Rubble with a Freeze-Bond Model in Dilated Polyhedral Discrete Element Method

2022 ◽  
Vol 129 (1) ◽  
pp. 1-22
Author(s):  
Biyao Zhai ◽  
Lu Liu ◽  
Shunying Ji
Keyword(s):  
Numerical Analysis ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Bond Model ◽  
Element Method

Nonlinear Dynamic Analysis of Space Frame Structures by Discrete Element Method

2014 ◽  
Vol 638-640 ◽  
pp. 1716-1719 ◽  
Author(s):  
Nian Qi ◽  
Ji Hong Ye
Keyword(s):  
Discrete Element Method ◽  
Dynamic Analysis ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Discrete Element ◽  
Internal Force ◽  
Frame Structures ◽  
Space Frame ◽  
Bond Model ◽  
Element Method

This document explores the possibility of the discrete element method (DEM) being applied in nonlinear dynamic analysis of space frame structures. The method models the analyzed object to be composed by finite particles and the Newton’s second law is applied to describe each particle’s motion. The parallel-bond model is adopted during the calculation of internal force and moment arising from the deformation. The procedure of analysis is vastly simple, accurate and versatile. Numerical examples are given to demonstrate the accuracy and applicability of this method in handling the large deflection and dynamic behaviour of space frame structures. Besides, the method does not need to form stiffness matrix or iterations, so it is more advantageous than traditional nonlinear finite element method.

ANALYSIS OF CONTROLLED COAL DISCHARGE AT MINING OF THICK FLAT COAL SEAMS USING SELF-CAVING TECHNOLOGY

2021 ◽  
Vol 4 (1) ◽  
pp. 389-399
Author(s):  
S.V. Klishin ◽  
Keyword(s):  
Numerical Analysis ◽  
Discrete Element Method ◽  
Underground Mining ◽  
Three Dimensional ◽  
Discrete Element ◽  
Flow Patterns ◽  
Coal Extraction ◽  
Coal Seams ◽  
Element Method

By the Discrete Element Method in a three-dimensional formulation, a numerical analysis of the areal coal discharge during the underground mining of thick flat coal seams using self-caving technology has been carried out. The kinematic flow patterns of mined rock depending on the number and location of the outlet openings are given, the zones of their mu-tual influence are determined. The change of coal extraction indicators depending on the num-ber of outlets and the distance between them are demonstrated.

scholarly journals A modified bond model for describing isotropic linear elastic material behaviour with the discrete element method

2021 ◽  
Author(s):  
Rahav Gowtham Venkateswaran ◽  
Ursula Kowalsky ◽  
Dieter Dinkler
Keyword(s):  
Discrete Element Method ◽  
Elastic Material ◽  
Poisson’S Ratio ◽  
Strain Energy ◽  
Discrete Element ◽  
Poisson's Ratio ◽  
Linear Elastic Material ◽  
Linear Elastic ◽  
Bond Model ◽  
Element Method

AbstractRecently, the discrete element method is increasingly being used for describing the behaviour of isotropic linear elastic materials. However, the common bond models employed to describe the interaction between particles restrict the range of Poisson’s ratio that can be represented. In this paper, to overcome the restriction, a modified bond model that includes the coupling of shear strain energy of neighbouring bonds is proposed. The coupling is described by a multi-bond term that enables the model to distinguish between shear deformations and rigid-body rotations. The positive definiteness of the strain energy function of the modified bond model is verified. To validate the model, uniaxial tension, pure shear and pure bending tests are performed. Comparison of the particle displacements with continuum mechanics solution demonstrates the ability of the model to describe the behaviour of isotropic linear elastic material for values of Poisson’s ratio in the range $$0 \le \nu < 0.5$$ 0 ≤ ν < 0.5 .

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