A Numerical Method to Predict Packing Density of Aggregates in Concrete

2011 ◽  
Vol 337 ◽  
pp. 313-316 ◽  
Author(s):  
Mohammad Reisi ◽  
Davood Mostofi Nejad
Keyword(s):  
Computer Simulation ◽  
Discrete Element Method ◽  
Numerical Method ◽  
Efficient Method ◽  
Packing Density ◽  
Experimental Tests ◽  
Discrete Element ◽  
Element Method

It is nowadays very clear that the single most important parameter influencing the performance of concrete is the packing density of the aggregates. Among aggregate characteristics, grading of aggregates has the most significant effect on packing density (PD) of aggregates. In the current sstudy, packing density of five aggregates were measured by experimental tests and computer simulation base on discrete element method (DEM). Obtained results show that the performed computer simulation is very efficient method to predict packing density and optimization grading of aggregates.

Interactive Force of Two-Dimensional Compressive Deformation by Discrete Element Method (DEM)

2014 ◽  
Vol 353 ◽  
pp. 106-110 ◽  
Author(s):  
Sarunya Promkotra ◽  
Tawiwan Kangsadan
Keyword(s):  
Computer Simulation ◽  
Discrete Element Method ◽  
Van Der Waals ◽  
Discrete Element ◽  
Interaction Force ◽  
Liquid Interface ◽  
Two Dimensional ◽  
Colloidal Aggregates ◽  
Air Liquid Interface ◽  
Element Method

Discrete Element Method (DEM) computer simulation is used to examine the influence of contact force between two-dimensional aggregates of polystyrene microsphere formed on the air-liquid interface. Colloidal aggregates have been treated as the granular material or discontinuum materials. The interaction force models are related to experiment which had done by digital video microscopy. The interaction mechanisms of the contact forces between particles in the colloidal system can be considered as a combination of spring and dashpot force and van der Waals force. According to the DEM, the interaction forces are evaluated to introduce relations between particles and the result comparison between the computer simulation and the experimental work. This study indicates that the behavior of the colloidal aggregates depends on the long-ranged (spring and dashpot) and the short-ranged interaction force (van der Waals). Besides, the behaviors shown in both computer simulation and the experiment are in good agreement. Thus, this computer simulation method can mimic the behavior of colloidal aggregates forming as a monolayer at the air-liquid interface.

Ellipse Particle Modeling for Fresh Concrete and Dynamic Simulation of Slump Test

2010 ◽  
Vol 168-170 ◽  
pp. 746-750
Author(s):  
Quan Yuan ◽  
Zhan Qi Guo
Keyword(s):  
Discrete Element Method ◽  
Numerical Method ◽  
Dynamic Simulation ◽  
Experimental Research ◽  
Fresh Concrete ◽  
Discrete Element ◽  
Qualitative Simulation ◽  
Slump Test ◽  
Particle Modeling ◽  
Element Method

The Discrete Element Method(DEM) has become a powerful numerical method for analysing discontinuous media. This paper provides a new ellipse particle modeling of fresh concrete by DEM. So far, research has been limited to experimental research and qualitative simulation. In this research, the parameters are defined from rheology. Then, a quantitative simulation is proposed. Slumping behaviors of fresh concrete are simulated.

scholarly journals Computer simulation of flat geogrids based on Discrete Element Method (DEM)

2019 ◽  
Vol 265 ◽  
pp. 01002
Author(s):  
Andrei Moshenzhal
Keyword(s):  
Computer Simulation ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Material Structure ◽  
Dem Simulation ◽  
Simulation Results ◽  
Element Method ◽  
The Way

The article presents the way of modelling flat geogrids using the Discrete Element Method (DEM). Simulation of geogrids is performed on the base of EDEM® software produced by DEM Solutions Ltd. The Hertz-Mindlin model with bonds is used as a model of particles interaction. The presented method of geogrid simulation using EDEM® software has some peculiarities in the formation of material structure. We compared two types of geogrids with the same characteristics formed out of a variety of balls with different radii. This article provides the simulation results of geogrid testing by calculating the force causing 2% and 5% tension (elongation) of the material.

Discrete element method (DEM) numerical modeling of double-twisted hexagonal mesh

2008 ◽  
Vol 45 (8) ◽  
pp. 1104-1117 ◽  
Author(s):  
David Bertrand ◽  
François Nicot ◽  
Philippe Gotteland ◽  
Stéphane Lambert
Keyword(s):  
Discrete Element Method ◽  
Experimental Tests ◽  
Discrete Element ◽  
Numerical Approach ◽  
Point Of View ◽  
Wire Mesh ◽  
Model Parameters ◽  
Elastoplastic Behavior ◽  
Mesh Model ◽  
Element Method

Double-twisted hexagonal mesh is used in several fields of civil engineering (gabion structures, retaining nets against rockfalls, etc.). This paper presents an approach based on the discrete element method (DEM) to model this specific mechanical system. Constitutive modeling in finite strains is proposed to take into account the elastoplastic behavior with hardening of the metallic wire mesh. Model parameters are calibrated from a macroscopic point of view by comparing simulations to experimental tensile strength tests performed at the wire-mesh sheet scale. Additional experimental tests, with different mesh sizes and wire diameters, are conducted, yielding valuable data to validate this numerical approach. Lastly, the modeling capabilities are investigated. The simulation of a rockfall-protection structure subjected to an impact loading is presented and the results are discussed from an engineering point of view.

scholarly journals Model Establishment of a Co-Based Metal Matrix with Additives of WC and Ni by Discrete Element Method

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2319 ◽  
Author(s):  
Xiuyu Chen ◽  
Guoqin Huang ◽  
Yuanqiang Tan ◽  
Hui Huang ◽  
Hua Guo ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Metal Matrix ◽  
Rupture Strength ◽  
Experimental Tests ◽  
Discrete Element ◽  
Calibration Procedure ◽  
Prediction Ability ◽  
Three Point Bending ◽  
Dem Model ◽  
Element Method

A metal matrix is an indispensable component of metal-bonded diamond tools. The composition design of a metal matrix involves a number of experiments, making costly in terms of time, labor, and expense. The discrete element method (DEM) is a potential way to relieve these costs. The aim of this work is to demonstrate a methodology for establishing and calibrating metal matrix’s DEM model. A Co-based metal matrix with WC and Ni additives (CoX–WC–Ni) was used, in which the Co-based metal was Co–Cu–Sn metal (CoX). The skeletal substances in the metal matrix were treated as particles in the model, and the bonding substances were represented by the parallel bond between particles. To describe the elasticity of the metal matrix, a contact bond was also loaded between particles. A step-by-step calibration procedure with experimental tests of three-point bending and compression was proposed to calibrate all microcosmic parameters involved during the establishment of DEM models: first for the CoX matrix, then for the CoX–WC matrix and CoX–Ni matrix, and finally for the CoX–WC–Ni matrix. The CoX–WC–Ni DEM model was validated by the transverse rupture strength (TRS) of two new compositions and the results indicated that the model exhibited a satisfactory prediction ability with an error rate of less than 10%.

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