scholarly journals Parametric Study on Strength Characteristics of Two-Dimensional Ice Beam Using Discrete Element Method

2021 ◽  
Vol 11 (18) ◽  
pp. 8409
Author(s):  
Seongjin Song ◽  
Wooyoung Jeon ◽  
Sunho Park
Keyword(s):  
Bond Strength ◽  
Discrete Element Method ◽  
Strength Criterion ◽  
Discrete Element ◽  
Strength Characteristics ◽  
Two Dimensional ◽  
Three Point Bending ◽  
Local Parameters ◽  
Compressive Tests ◽  
Element Method

Strength characteristics of a two-dimensional ice beam were studied using a discrete element method (DEM). The DEM solver was implemented by the open-source discrete element method libraries. Three-point bending and uniaxial compressive tests of the ice beam were simulated. The ice beam consisted of an assembly of disk-shaped particles with a particular thickness. The connection of the ice particles was modelled using a cuboid element, which represents a bond. If the stress acting on the bond exceeded the bond strength criterion, the bond started to break, explaining the cracking of the ice beam. To find out the effect of the local parameters of the contact and bond models on the ice fracture, we performed numerical simulations for various bond Young‘s modulus of the particles, the bond strength, and the relative particle size ratio.

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 simulations of fracture in concrete under uniaxial compression based on its real internal structure

2017 ◽  
Vol 27 (4) ◽  
pp. 578-607 ◽  
Author(s):  
Jan Suchorzewski ◽  
Jacek Tejchman ◽  
Michał Nitka
Keyword(s):  
Discrete Element Method ◽  
Uniaxial Compression ◽  
Three Dimensional ◽  
Discrete Element ◽  
Cement Matrix ◽  
Two Dimensional ◽  
Compression Tests ◽  
Digital Microscope ◽  
Complex Crack ◽  
Element Method

The paper describes experimental and numerical results of concrete fracture under quasi-static uniaxial compression. Experimental uniaxial compression tests were performed on concrete cubic specimens. Fracture in concrete was detected at the aggregate level by means of three non-destructive methods: three-dimensional X-ray microcomputed tomography, two-dimensional scanning electron microscope and manual two-dimensional digital microscope. The discrete element method was used to directly simulate experiments. Concrete was modelled as a random heterogeneous four-phase material composed of aggregate particles, cement matrix, interfacial transitional zones and macrovoids based on experimental images. Two- and three-dimensional analyses were carried out. In two-dimensional analyses, the real aggregate shape was created by means of clusters of spheres. In three-dimensional calculations, spheres were solely used. A satisfactory agreement between numerical and experimental results was achieved in two-dimensional analyses. The model was capable of accurately predicting complex crack paths and the corresponding stress–strain responses observed in experiments.

scholarly journals Flow Regime Map for Two Dimensional Spouted Bed and Comparison with Simulation by Discrete Element Method.

1999 ◽  
Vol 25 (6) ◽  
pp. 1037-1039 ◽  
Author(s):  
TOSHIRO TSUJI ◽  
TOMOKO CHIBA ◽  
TOSHIHARU SHIBATA ◽  
OSAMU UEMAKI ◽  
HIRONORI ITOH
Keyword(s):  
Discrete Element Method ◽  
Flow Regime ◽  
Discrete Element ◽  
Two Dimensional ◽  
Spouted Bed ◽  
Regime Map ◽  
Flow Regime Map ◽  
Element Method

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.

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