Numerical Simulation of Fracture Propagation of Concrete on Meso-Level

2010 ◽  
Vol 148-149 ◽  
pp. 80-83
Author(s):  
Feng Wu
Keyword(s):  
Numerical Simulation ◽  
Fracture Propagation ◽  
Fracture Characteristic ◽  
Interface Element ◽  
Aggregate Model ◽  
Meso Level ◽  
Uniaxial Load ◽  
Element Method ◽  
Three Phases

In the paper, concrete on meso-level is taken as three phases composites consisting of aggregate、matrix and bond between matrix and aggregate. Model and arithmetic of Interface Element Method (IEM) is introduced and used to study the fracture characteristic and process of concrete under uniaxial load.

Study of Interface Problems Using Finite Element Method

2007 ◽  
Vol 353-358 ◽  
pp. 953-956
Author(s):  
Li Jun Su ◽  
Hong Jian Liao ◽  
Shan Yong Wang ◽  
Wen Bing Wei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Thin Layer ◽  
Interface Problems ◽  
Interface Element ◽  
Contact Method ◽  
Engineering Problems ◽  
Element Method

In numerical simulation of engineering problems, it is important to properly simulate the interface between two adjacent parts of the model. In finite element method, there are generally three methods for simulating interface problems: interface element method, surface based contact method and the method by using a thin layer of continuum elements. In this paper, simulation of interface problems is conducted using continuum elements and surface based contact methods. The results from each method are presented and compared with each other.

scholarly journals Mesoscopic Numerical Simulation of Fracture Process and Failure Mechanism of Concrete Based on Convex Aggregate Model

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Yijiang Peng ◽  
Xiyun Chen ◽  
Liping Ying ◽  
Ying Chen ◽  
Lijuan Zhang
Keyword(s):  
Numerical Simulation ◽  
Failure Mechanism ◽  
Fracture Process ◽  
Compressive Loading ◽  
Nonlinear Behavior ◽  
Heterogeneous Material ◽  
Specimen Size ◽  
Aggregate Model ◽  
Force Element ◽  
Element Method

To investigate the fracture process and failure mechanism of concrete subjected to uniaxial compressive loading, a new finite element method—the base force element method (BFEM)—was adopted in the modeling of numerical simulation. At mesoscale, concrete is considered as a three-phase heterogeneous material composed of aggregate particles, cement mortar, and the interfacial transition zones between the two phases. A two-dimensional random convex aggregate model was established using the principle of the area equivalence method. A multistage linear damage constitutive model that can describe nonlinear behavior of concrete under mechanical stress was proposed. The mechanical properties of concrete mesoscopic components are determined. The numerical simulation results indicate that the base force element method can be applied to predict the failure pattern of concrete under compressive loading, which have a good accordance with the available experiment data. The stress contour plots were given and used to analyze the failure mechanism of concrete. The effects of specimen size on the strength of concrete material were studied. It is found that compressive strength of concrete decreases as the specimen size increases. In addition, the influences of aggregate distribution, coarse aggregate content, and end friction on concrete performance are explored.

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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