scholarly journals Influence of nodular structures on fracture development in fine-grained rocks: numerical simulations based on the discrete element method

2019 ◽  
Author(s):  
Qingfeng Meng
Keyword(s):  
Discrete Element Method ◽  
Numerical Simulations ◽  
Discrete Element ◽  
Fine Grained ◽  
Fracture Development ◽  
Element Method

scholarly journals Micromechanical Numerical Modelling on Compressive Failure of Recycled Concrete using Discrete Element Method (DEM)

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4329
Author(s):  
Xin Tan ◽  
Zhengbo Hu ◽  
Wengui Li ◽  
Suhua Zhou ◽  
Tenglong Li
Keyword(s):  
Discrete Element Method ◽  
Numerical Simulations ◽  
Discrete Element ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Image Correlation ◽  
Recycled Aggregate ◽  
Nanoindentation Test ◽  
Aggregate Concrete ◽  
Element Method

This paper investigates the failure processes of recycled aggregate concrete by a model test and numerical simulations. A micromechanical numerical modeling approach to simulate the progressive cracking behavior of the modeled recycled aggregate concrete, considering its actual meso-structures, is established based on the discrete element method (DEM). The determination procedure of contact microparameters is analyzed, and a series of microscopic contact parameters for different components of modeled recycled aggregate concrete (MRAC) is calibrated using nanoindentation test results. The complete stress–strain curves, cracking process, and failure pattern of the numerical model are verified by the experimental results, proving their accuracy and validation. The initiation, growth, interaction, coalescence of microcracks, and subsequent macroscopic failure of the MRAC specimen are captured through DEM numerical simulations and compared with digital image correlation (DIC) results. The typical cracking modes controlled by meso-structures of MRAC are concluded according to numerical observations. A parameter study indicates the dominant influence of the macroscopic mechanical behaviors from the shear strength of the interfacial transition zones (ITZs).

Study of Mastic-Aggregate Interfacial Adhesion in Cement Emulsified Asphalt Mixture Based on the Discrete Element Method (DEM)

2011 ◽  
Vol 413 ◽  
pp. 367-370
Author(s):  
Zhen Jun Wang ◽  
Rui Wang ◽  
Qiong Wang ◽  
Guang Ying Yang
Keyword(s):  
Discrete Element Method ◽  
Asphalt Mixture ◽  
Strain Curve ◽  
Discrete Element ◽  
Inorganic Materials ◽  
Asphalt Binders ◽  
Limestone Aggregate ◽  
Fracture Development ◽  
Emulsified Asphalt ◽  
Element Method

Cement emulsified asphalt mixture is a kind of composite materials, which is comprised of organic and inorganic materials, such as emulsified asphalt and cement, and has both advantages of cement concrete and asphalt concrete. Aiming at the problems of cement emulsified asphalt mixture that adhesion decline and road performance down in the using of process, the Discrete Element Method (DEM) was used to simulate two different kinds of aggregate used in the mixture. Through comparing the splitting strength, stress-strain curve, fracture development situation, and so on, suitable aggregate type, limestone aggregate, was obtained, which had higher adhesion property with cement emulsified asphalt binders.

Effect of fine-grained dipping interlayers on mechanical behavior of tailings using discrete element method

2019 ◽  
Vol 104 ◽  
pp. 288-299 ◽  
Author(s):  
Qinglin Chen ◽  
Chao Zhang ◽  
Chunhe Yang ◽  
Changkun Ma ◽  
Zhenkai Pan
Keyword(s):  
Discrete Element Method ◽  
Mechanical Behavior ◽  
Discrete Element ◽  
Fine Grained ◽  
Element Method

Modelling of seismicity-induced cracking of stone columns using discrete-element-method (DEM), a case study of Eufrasius cathedral, Porec, Croatia

2020 ◽  
Author(s):  
Ali Besharatinezhad ◽  
Ákos Török ◽  
Mohammad Al-Tawalbeh ◽  
Miklós Kázmér
Keyword(s):  
Discrete Element Method ◽  
Failure Mechanism ◽  
Failure Process ◽  
Discrete Element ◽  
Three Dimensions ◽  
Stone Columns ◽  
Stone Column ◽  
Lagrangian Analysis ◽  
Fracture Development ◽  
Element Method

<p>The Eufrasius Cathedral of Poreč in Istria Peninsula, Croatia, was built in the 6th century, The nave collapsed in parts due to the AD 1440 earthquake. Nave and aisles are supported by 18 monolithic columns of Proconnesian marble. Seventeen of the columns bear various fractures, forming two groups: (1) axis-parallel fractures and (2) oblique fractures. Azimuths of dip directions of oblique fractures indicate N-S shaking.</p><p>In this study, the fracture development and cracking of a stone column was modelled using computer code. To model the current fracture pattern and to link it to seismic activity a Lagrangian analysis of continua in three dimensions (FLAC3D) is employed to reveal the non-linear behaviour of the stone column. A 3-Dimensional model based on discrete-element-method (DEM) has been created to study the failure process of the ancient stone column under static and dynamic loads. A combination of vertical and horizontal loads with a dynamic load due to the earthquake has been imposed horizontally. The influence of different parameters such as mechanical properties of rock, the magnitude of the earthquake were also assessed to observe their influence on the failure mechanism of rock. The DEM model was able to describe the observed crack pattern and it has proved the applicability of FLAC3D to describe failure mechanism of stone columns.</p>

Numerical Simulations of Isostatic and Die Compaction of Powder by The Discrete Element Method

2009 ◽  
Author(s):  
J.-F. Jerier ◽  
B. Harthong ◽  
D. Imbault ◽  
F.-V. Donzé ◽  
P. Dorémus ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Numerical Simulations ◽  
Discrete Element ◽  
Die Compaction ◽  
Element Method
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