scholarly journals Study on the Interaction between Soil and the Five-Claw Combination of a Mole Using the Discrete Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yuwan Yang ◽  
Mo Li ◽  
Jin Tong ◽  
Yunhai Ma
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Rake Angle ◽  
Soil Resistance ◽  
Distance Ratio ◽  
Soil Failure ◽  
Soil Cutting ◽  
Soil Bin ◽  
Rupture Distance ◽  
Element Method

A mole is a born digger spending its entire existence digging tunnels. The five claws of a mole’s hand are combinative to cut soil powerfully and efficiently. However, little was known in detail about the interaction between the soil and the five-claw combination. In this study, we simulated the soil cutting process of the five-claw combination using the discrete element method (DEM) as an attempt for the potential design of soil-engaging tools to reduce soil resistance. The five-claw combination moved horizontally in the soil bin. Soil forces (draught and vertical forces) and soil failure (soil rupture distance ratio) were measured at different rake angles and speeds. Results showed that the draught and vertical forces varied nonlinearly as the rake angle increased from 10 to 90°, and both changed linearly with the speed increasing from 1 to 5 m/s. The curve of the soil rupture distance ratio with rake angles could be better described using a quadric function, but the speed had little effect on the soil rupture distance ratio. Notably, the soil rupture distance ratio of the five-claw combination in simulation was on average 19.6% lower than the predicted ratio of simple blades at different rake angles indicating that the five-claw combination could make less soil failure and thereby produce lower soil resistance. Given the draught and vertical forces, the performance of the five-claw combination was optimized at the rake angle of 30°.

Study on Machining Mechanism of Glass Using Discrete Element Method

2014 ◽  
Vol 577 ◽  
pp. 108-111 ◽  
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.

scholarly journals Simulating the effect of rake angle on narrow opener performance with the discrete element method

2018 ◽  
Vol 171 ◽  
pp. 1-15 ◽  
Author(s):  
James B. Barr ◽  
Mustafa Ucgul ◽  
Jack M.A. Desbiolles ◽  
John M. Fielke
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Rake Angle ◽  
Element Method

scholarly journals Study on track–soil traction using discrete element method simulation and soil bin test

AIP Advances ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 075307
Author(s):  
Linxuan Zhou ◽  
Jingwei Gao ◽  
Pan Cheng ◽  
Cheng Hu
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Discrete Element Method Simulation ◽  
Soil Bin ◽  
Element Method

A Review on Application of Discrete Element Method in Soil Cutting Process

2013 ◽  
Vol 444-445 ◽  
pp. 1477-1482
Author(s):  
Ju Yang ◽  
Cheng Wu Wang ◽  
Feng Hua Wang ◽  
Xiao Jing Yang
Keyword(s):  
Discrete Element Method ◽  
Agricultural Production ◽  
Agricultural Soils ◽  
Discrete Element ◽  
Cutting Process ◽  
Basic Principles ◽  
Discrete Nature ◽  
Soil Cutting ◽  
External Forces ◽  
Element Method

Soil is one of the important mediators in the agricultural production and its particle is a discontinuous, heterogeneity and nonlinear natural geological substance. It is difficult to analyze the soil cutting process by using traditional methods. According to the discrete nature of the agricultural soils, discrete element method based on the discontinuity assumptions can be an alternative to analyze the changes under external forces in the soil cutting process. This article describes the basic principles, its applications and its prospects of the discrete element method, especially in the field of soil cutting.

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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