Flexural strength test and meso-mechanical evolution behavior of cement concrete based on discrete element method

2021 ◽  
Author(s):  
Zhanyou Yan ◽  
Huien Ge ◽  
Shaohua Guo ◽  
Xiaoyong Wu ◽  
Guofang Zhao
Keyword(s):  
Flexural Strength ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Strength Test ◽  
Cement Concrete ◽  
Mechanical Evolution ◽  
Evolution Behavior ◽  
Element Method

Thermal Conductivity of Cement Concrete Using Discrete Element Method

2014 ◽  
Vol 1023 ◽  
pp. 32-35
Author(s):  
Wei Dong Liu
Keyword(s):  
Thermal Conductivity ◽  
Numerical Model ◽  
Discrete Element Method ◽  
Linear Thermal Expansion ◽  
Discrete Element ◽  
Constant Heat Flux ◽  
Test Method ◽  
Great Level ◽  
Cement Concrete ◽  
Element Method

Consideration on the traditional experiment was time-consuming and required a major investment in human and material resource, even leaded to a great level of error in the process of experiment. The new test method of thermal conductivity of cement concrete based on discrete element method was presented. The cylinder-shaped specimen was created via the mass graduation of the cement concrete, and make sure the numerical model was identical to the truth experiment. The thermal micro-properties composed of density,specific heat, coefficient of linear thermal expansion and thermal resistance were conducted. The applied constant heat flux and constant temperature as the boundaries were investigated via the herein developed model. The results testified that the virtual test data was nearly identical with the analytical values for both different boundaries, and it confirmed that the new numerical model using discrete element method is feasible and reliable. It also supplied a new method on thermal properties study.

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 101-108
Author(s):  
Daniel Varney ◽  
Douglas Bousfield
Keyword(s):  
Discrete Element Method ◽  
Flexural Modulus ◽  
Single Layer ◽  
Discrete Element ◽  
Flexural Stress ◽  
Layer System ◽  
Three Point Bending ◽  
Moving Force ◽  
Coating Layers ◽  
Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

Discrete element method–computational fluid dynamics analyses of flexible fibre fluidization

2021 ◽  
Vol 910 ◽  
Author(s):  
Yiyang Jiang ◽  
Yu Guo ◽  
Zhaosheng Yu ◽  
Xia Hua ◽  
Jianzhong Lin ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Dynamics Analyses ◽  
Element Method

Abstract

scholarly journals Numerical simulation on coal loading process of shearer drum based on discrete element method

2021 ◽  
pp. 014459872110135
Author(s):  
Zhen Tian ◽  
Shuangxi Jing ◽  
Lijuan Zhao ◽  
Wei Liu ◽  
Shan Gao
Keyword(s):  
Numerical Simulation ◽  
Discrete Element Method ◽  
Loading Rate ◽  
Low Cost ◽  
Element Model ◽  
Discrete Element ◽  
Helix Angle ◽  
Loading Process ◽  
Coal Particles ◽  
Element Method

The drum is the working mechanism of the coal shearer, and the coal loading performance of the drum is very important for the efficient and safe production of coal mine. In order to study the coal loading performance of the shearer drum, a discrete element model of coupling the drum and coal wall was established by combining the results of the coal property determination and the discrete element method. The movement of coal particles and the mass distribution in different areas were obtained, and the coal particle velocity and coal loading rate were analyzed under the conditions of different helix angles, rotation speeds, traction speeds and cutting depths. The results show that with the increase of helix angle, the coal loading first increases and then decreases; with the increase of cutting depth and traction speed, the coal loading rate decreases; the increase of rotation speed can improve the coal loading performance of drum to a certain extent. The research results show that the discrete element numerical simulation can accurately reflect the coal loading process of the shearer drum, which provides a more convenient, fast and low-cost method for the structural design of shearer drum and the improvement of coal loading performance.

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