Discrete Element Method Simulation of Residual Stresses in Grinding of Granite with Single Diamond Grain

The discrete element model and the model of single diamond grain grinding process of granite were constructed through numerical simulation and calibration of mechanical properties. Based on the models, the grinding processes of granite was dynamically simulated, and the effects of different rank angles, grinding speeds and cutting depths on the distribution of residual stresses as the depth of workpiece were also analyzed. The results show that the residual stress in the workpiece is relatively small after grinding when the tool rank angle lays in a small negative (-200 to 00). Otherwise, when the tool rank angle is too large or too small, there is a significant residual stress. The residual stresses in the workpiece increase with the increase of grinding speed and cutting depth. The residual stress nephogram was accomplished and the generated mechanism of residual stress was also analyzed. The results proved that the discrete element method (DEM) is an effective way to analyze the residual stress

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Study on Machining Mechanism of Glass Using Discrete Element Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.577.108 ◽

2014 ◽

Vol 577 ◽

pp. 108-111 ◽

Cited By ~ 1

Author(s):

Ying Qiu ◽

Mei Lin Gu ◽

Feng Guang Zhang ◽

Zhi Wei

Keyword(s):

Discrete Element Method ◽

Element Model ◽

Discrete Element ◽

Rake Angle ◽

Milling Process ◽

Micro Milling ◽

Discrete Element Model ◽

Machined Surface ◽

Damage Depth ◽

Element Method

The discrete element method (DEM) is applied to glass micromachining in this study. By three standard tests the discrete element model is established to match the main mechanical properties of glass. Then, indentating, cutting, micro milling process are simulated. Results show that the vertical damage depth is prevented from reaching the final machined surface in cutting process. Tool rake angle is the most remarkable factor influencing on the chip deformation and cutting force. The final machined surface is determined by the minimum cutting thickness per edge. Different cutting thickness, cutter shape and spindle speed largely effect on the mechanism of glass.

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Modelling Changes in the Dynamic Response of a Cantilever Beam During the Machining Process Using the Discrete Element Method

Volume 8: 28th Conference on Mechanical Vibration and Noise ◽

10.1115/detc2016-60447 ◽

2016 ◽

Author(s):

Anders H. Andersen ◽

Frederik F. Foldager ◽

Kasper Ringgaard ◽

Ole Balling

Keyword(s):

Finite Element ◽

Discrete Element Method ◽

Cantilever Beam ◽

Element Model ◽

Discrete Element ◽

Machining Process ◽

Discrete Element Model ◽

Machining Processes ◽

Element Analysis ◽

Element Method

Production of high accuracy components often involves machining processes. If the machining processes are pushed to increase productivity, it can become challenging to comply with strict tolerances and surface finish requirements. Both the finite element method and the discrete element method have been used for off-line deflection compensation and stability analysis. This contribution investigates the capabilities of a simplified discrete element model in the use for offline simulation of the dynamic behavior of a workpiece during machining. A cantilever beam is modelled and the natural frequencies are monitored as material is removed. Results are compared with theoretical frequencies and with finite element analysis. The model shows a good correspondence in the frequency behavior as material is removed compared with finite element results, though the simple discrete element model under-predicts the stiffness of the beam with approximate 5% for the first two modes.

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Modeling of Shield Machine Tunneling Experiment by Discrete Element Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.1200 ◽

2014 ◽

Vol 556-562 ◽

pp. 1200-1204 ◽

Cited By ~ 1

Author(s):

Li Wu ◽

Chang Liu

Keyword(s):

Discrete Element Method ◽

Model Experiment ◽

Element Model ◽

Discrete Element ◽

Discrete Element Model ◽

Rotation Direction ◽

Particle Parameters ◽

Shield Machine ◽

Element Method

To discover the interaction rules between the cutterhead of shield machine and the soils, the model experiment of shield machine tunneling is performed, and the particle discrete element model of the experiment is built. By adjusting the particle parameters, the simulated cutterhead torque is compatible with the experiment observed results. Then the displacement of soils in the front of the cutterhead, behind the cutterhead, and in the front of the chamber board is obtained. The soils in the front of the cutterhead try to flow into the nearest opening. However, the soils behind the cutterhead move toward the wall of out barrel. The movement of soils in front of the chamber board is in accordance with the rotation direction of the cutterhead.

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Numerical simulation on coal loading process of shearer drum based on discrete element method

Energy Exploration & Exploitation ◽

10.1177/01445987211013536 ◽

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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