scholarly journals Fracture Energy of Foamed Concrete: Numerical Modelling Using the Combined Finite-Discrete Element Method

2017 ◽  
Vol 103 ◽  
pp. 02030 ◽  
Author(s):  
Z. M. Jaini ◽  
N. Abd Rahman ◽  
R. H. M. Rum ◽  
M. M. Haurula
Keyword(s):  
Numerical Modelling ◽  
Discrete Element Method ◽  
Fracture Energy ◽  
Discrete Element ◽  
Foamed Concrete ◽  
Element Method

Failure Surface Variation Obtained with the Truss-Like Discrete Element Method

2015 ◽  
Vol 784 ◽  
pp. 225-232
Author(s):  
Guilherme Schumacher da Silva ◽  
Fabrício Goulart Fernandes ◽  
Angélica Bordin Colpo ◽  
Vicente B. Puglia ◽  
Luis E. Kosteski
Keyword(s):  
Spatial Distribution ◽  
Discrete Element Method ◽  
Fracture Energy ◽  
Failure Criterion ◽  
Failure Surface ◽  
Discrete Element ◽  
Constitutive Law ◽  
Surface Variation ◽  
Spatial Lattice ◽  
Element Method

This paper presents the study of failure surface obtained in the truss-like Discrete Element Method (DEM). The element constitutive law considers the fracture energy of the material and its spatial variation is used to take into account the heterogeneity of the simulated materials. It is studied the influence of spatial distribution of fracture energy and the spatial lattice perturbation on the DEM failure surface. A DEM failure criterion is compared with concrete and rock failure.

scholarly journals Numerical modelling of suffusion by discrete element method: a new internal stability criterion based on mechanical behaviour of eroded soil

2017 ◽  
Vol 140 ◽  
pp. 10011
Author(s):  
Nadjibou Abdoulaye Hama ◽  
Tariq Ouahbi ◽  
Said Taibi ◽  
Hanène Souli ◽  
Jean-Marie Fleureau ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Discrete Element Method ◽  
Mechanical Behaviour ◽  
Stability Criterion ◽  
Discrete Element ◽  
Internal Stability ◽  
Element Method

Numerical Modelling of Masonry Dams Using the Discrete Element Method

2016 ◽  
pp. 171-199
Author(s):  
Eduardo Martins Bretas
Keyword(s):  
Numerical Modelling ◽  
Discrete Element Method ◽  
Seismic Analysis ◽  
Failure Mechanisms ◽  
Discrete Element ◽  
Structural Safety ◽  
Structural Behaviour ◽  
History Of ◽  
Numerical Tool ◽  
Element Method

This work concerns the numerical modelling of masonry dams using the Discrete Element Method. It begins with a review of the history of masonry dams and their behaviour. A numerical tool based on the Discrete Element Method developed specifically for the structural assessment of masonry dams is then presented. The mechanical calculations performed by the tool are discussed in detail, together with the approach used for the modelling of passive anchors and the modules for seismic analysis and hydromechanical analysis. Structural and hydraulic analyses of a diverse set of existing masonry dams conducted using the tool are then presented. The Discrete Element Method is shown to be capable of reproducing the structural behaviour of masonry dams and identifying their likely failure mechanisms as required for structural safety evaluations.

Experimental Research on the Bending and Fracture Characteristics of Cotton Stalk

2021 ◽  
Vol 64 (6) ◽  
pp. 1771-1779
Author(s):  
Peng Jiang ◽  
Yaping Li ◽  
Jiali Li ◽  
Hewei Meng ◽  
Xiangbin Peng ◽  
...  
Keyword(s):  
Moisture Content ◽  
Discrete Element Method ◽  
Fracture Energy ◽  
Block Design ◽  
Discrete Element ◽  
Cotton Stalk ◽  
Fracture Characteristics ◽  
The Relationship ◽  
Specific Fracture ◽  
Element Method

HighlightsA two-factor randomized block design was used to study the influence of experimental factors on indicators.Specific fracture energy can indicate the relationship between mass and power.A cotton stalk model was established using the discrete element method (DEM).Abstract. Effectively chopping of the mixture of mulch film and cotton stalk recycled by machine is the only way to achieve subsequent separation of the materials. Cotton stalk is one of the main components of the mixture. According to the working principle of a chopping device, the bending and fracture characteristics of cotton stalk samples were measured. A two-factor random block design was used to study the effects of moisture content and sample location on the plant on the mechanical characteristics of the stalk samples. According to the results, the specific fracture energy of the stalk samples was calculated. The results showed that the relationship between the moisture content and bending performance of the samples was an inverse proportional function in general. However, when the moisture content was 20% to 30%, the fracture energy in the double-support bending tests was low, which was therefore the most suitable condition for chopping. In addition, a cotton stalk model was established using the discrete element method (DEM), and the optimal parameter combination was determined. Compared with the actual test results, the model error of the peak bending force was 1.20%. This study can support the analysis of chopping device simulation and material preparation in experimental research. Keywords: Bending fracture characteristics, Cotton stalk, Discrete element method, Three-point bending test.

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.

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