Fretting Wear Modeling of Coated and Uncoated Surfaces Using the Combined Finite-Discrete Element Method

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Benjamin D. Leonard ◽  
Pankaj Patil ◽  
Trevor S. Slack ◽  
Farshid Sadeghi ◽  
Sachin Shinde ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Normal Force ◽  
Discrete Element ◽  
Fretting Wear ◽  
Wear Loss ◽  
New Approach ◽  
Frictional Shear Stress ◽  
Algorithm Stability ◽  
Force Displacement ◽  
Element Method

A new approach for modeling fretting wear in a Hertzian line contact is presented. The combined finite-discrete element method (FDEM) in which multiple finite element bodies interact as distinct bodies is used to model a two-dimensional fretting contact with and without coatings. The normal force and sliding distance are used during each fretting cycle, and fretting wear is modeled by locally applying Archard’s wear equation to determine wear loss along the surface. The FDEM is validated by comparing the pressure and frictional shear stress results to the continuum mechanics solution for a Hertzian fretting contact. The dependence of the wear algorithm stability on the cycle increment of a fretting simulation is also investigated. The effects of friction coefficient, normal force, displacement amplitude, coating thickness, and coating modulus of elasticity on fretting wear are presented.

The prediction of wear on a scraper conveyor chute affected by different factors based on the discrete element method

2019 ◽  
Vol 233 (17) ◽  
pp. 6229-6239 ◽  
Author(s):  
Rui Xia ◽  
Xuewen Wang ◽  
Bo Li ◽  
Xing Wei ◽  
Zhaojian Yang
Keyword(s):  
Discrete Element Method ◽  
Interaction Analysis ◽  
Discrete Element ◽  
Wear Loss ◽  
Analysis Model ◽  
Term Operation ◽  
Coal Particles ◽  
Scraper Conveyor ◽  
Interaction Analysis Model ◽  
Element Method

During long-term operation, the scraper conveyor chute is seriously attrited by the friction of coal, gangue, and scraper chain. In this study, the discrete element method was applied to establish the bulk coal–scraper conveyor interaction analysis model to predict the wear of a scraper conveyor chute during the transporting process. The wear of the chute was investigated under various working conditions and bulk coal characteristics. Results indicated that the chute wear has a negative correlation with the laying angle of the scraper conveyor and increased with the chain speed. The wear was more severe as the increasing of gangue content, hardness, and size of the coal particles. In addition, the wear degree in different sections on the chute was predicted. Results showed that the section near the coal falling point underwent more intense collisions and impact and, thus, the wear was more serious at this location. The wear loss decreased with the increasing distance away from this point. This research can be used for predicting the wear of a scraper conveyor working under different mines. What’s more, the wear-resistant treatment can be applied on the particular areas according to the mine conditions based on this study.

Discrete Element Method applied to the simulation of the stress state in granular materials

Soil Research ◽  
2019 ◽  
Vol 57 (1) ◽  
pp. 85
Author(s):  
Gabriela Carolina Martínez Morillo ◽  
Alex Alves Bandeira
Keyword(s):  
Discrete Element Method ◽  
Granular Materials ◽  
Soil Mechanics ◽  
Particle Method ◽  
Discrete Element ◽  
Computational Costs ◽  
Basic Physics ◽  
Force Displacement ◽  
Graphical Presentation ◽  
Element Method

This work examines the Discrete Element Method (DEM), also known as the particle method, for its application in soil mechanics, specifically to calculate the tension acting on granular materials without cohesion. First, theoretical aspects of soil mechanics and the physical properties of some types of granular materials are presented, and the material properties are used afterwards in numerical examples. Following this, the DEM formulation is described, corresponding to the force and movement equations acting on each particle. For that, Newton’s second law, the force–displacement law, Hertz’s contact law, and some concepts from particle mechanics are defined. The integration over time process and the numerical solution algorithm presented by T.I. Zohdi are also described. Additionally, a new optimisation process for contact detection is described, one which significantly diminishes computational costs and therefore analysis time. Finally, some basic physics examples necessary for the formulation validation and application in soil mechanics are presented. The results obtained with the software developed in this research are then compared with soil mechanics results, which are simulated using the GeoStudio software. The GiD program was utilised for graphical presentation of the results.

Review and extension of normal force models for the Discrete Element Method

2007 ◽  
Vol 171 (3) ◽  
pp. 157-173 ◽  
Author(s):  
H. Kruggel-Emden ◽  
E. Simsek ◽  
S. Rickelt ◽  
S. Wirtz ◽  
V. Scherer
Keyword(s):  
Discrete Element Method ◽  
Normal Force ◽  
Discrete Element ◽  
Element Method

Simulation on the Indentation of Large Grain in the Semi-Fixed Abrasive Plate with Discrete Element Method

2009 ◽  
Vol 416 ◽  
pp. 205-209 ◽  
Author(s):  
Ju Long Yuan ◽  
Ke Feng Tang ◽  
Zhi Wei Wang ◽  
Tao Hong
Keyword(s):  
Discrete Element Method ◽  
Normal Force ◽  
Influence Factor ◽  
Discrete Element ◽  
Vertex Angle ◽  
In The Beginning ◽  
Fixed Abrasive ◽  
Element Method

This paper analyses the influence of indenter’s vertex angle on the ‘trap’ effect of the semi-fixed abrasive plate (SAP) with discrete element method. The indenters of different degree vertex angle are generated by discrete element method, then the indenter is applied processing velocity, which let the indenter press into the SAP, finally three curves of normal force and displacement are gained. From the curves, the normal force of the indenters doesn’t increase quickly and stay in stable in the beginning, because the SAP is full of pore, which let the indenter easily press into the SAP. Through the above indenter simulation, the relations between the lasting time of the ‘trap’ effect and the indenter’s vertex angle are in reverse proportion, if the indenter’s vertex angle is smaller, the lasting time of the ‘trap’ effect of SAP is longer, and the size of large grain is an influence factor in the ‘trap’ effect of SAP.

Simulation on the Wear Behavior of the Wear-Resistant Surfaces Using Discrete Element Method

2011 ◽  
Vol 199-200 ◽  
pp. 729-733
Author(s):  
Rui Zhang ◽  
Guang Ming Chen ◽  
Wen Feng Fan ◽  
Jian Qiao Li
Keyword(s):  
Discrete Element Method ◽  
Abrasive Wear ◽  
Wear Behavior ◽  
Discrete Element ◽  
Wear Loss ◽  
Dynamic Force ◽  
Wear Resistant ◽  
Abrasive Wear Behavior ◽  
Minor Injuries ◽  
Element Method

On the basis of the discrete element method (DEM), the non-linear mechanical model of the wear-resistant body surfaces was established. The step, convexity, and scale arranged structures of the wear-resistant surfaces and their abrasive wear systems were established with the software PFC2D®. Through the qualitative analysis on the morphology, the contact-bond fields and the contact-force chains, the minor injuries and the breakaway of the debris of the wear behaviors are observed. Besides, the dynamic force acted on the wear-resistant structures was studied through the quantitative analysis. Numeral simulation shows that the step structure was worn dramatically in its tip part, the convexity structure distributes the stress prominently and the scale structure shows the best wear-resistant function. The wear loss of the front monomers of the step, convexity, and scale structures are 2.43%, 2.02%, and 1.12% respectively after being worn for eight minutes in the simulation, which are in accordance with the experimental results. The numerical simulation on the abrasive wear behavior of the biological wear-resistant structures by DEM helps to reveal the wearable mechanism of the wear-resistant surfaces. Moreover, it provides a new method for studying the bionic wear-resistant surfaces and structures.

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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