Investigation of stress distribution in a dragline bucket using finite element analysis

Download

index.pdf

Date

2011

Author

Gölbaşı, Onur

Metadata

Show full item record

Item Usage Stats

267
views

112
downloads

Overburden stripping is one of the essential activities in open-cast mines before starting the ore production. Due to the economic advantages, dragline is a widely utilized machinery in the overburden excavation. These earthmovers carry out the earthmoving process with dragging, hoisting and dumping actions of the bucket. Dragline excavator’s efficiency is critically important, since poor performance of a dragline in the mine site directly affects the total efficiency of ore production. Therefore, productivity studies about dragline should be directed to decrease cycle time and increase payload, with avoiding catastrophic failure. In this regard, determination of stress distribution on the front-end components of dragline is meaningful to detect the external factors against dragline operation. In order to provide insight into the dragline bucket-formation interaction and stress distribution on the bucket, this research studies the simulation of horizontally moving dragline bucket where passive earth forces of the formation create resistance to the movement. Within the scope of simulation, (i) solid models of dragline bucket and the rigging mechanism were created in the Computer-Aided Drawing (CAD) environment, (ii) the model was transferred to the Finite-Element Analysis (FEA) software, (iii) two different case studies were simulated in the FEA virtual environment. One of the cases handled the stress investigation on the dragline bucket at the first interaction with the formation, while the other focused on the stress formations on a moving dragline bucket. Simulation results showed that overloading conditions occurred on bottom edges of the bucket lip for the first case, and drag hitch part and digging teeth for the second case. Moreover, a sensitivity analysis was carried out to measure the effects of formation specification changes on the stress values on the bucket. The analysis showed that stress values on the bucket elements were most sensitive to internal friction angle and least sensitive to density. Consequently, this thesis study discusses stress and deformation components on the dragline bucket during the interaction with formation. Since there is not enough number of research studies in the literature about the stress investigation on a moving dragline bucket, this thesis study is expected to provide benefit to understand the basis of dragline bucket actions.

Subject Keywords

Mining engineering., Finite Element Analysis.

URI

http://etd.lib.metu.edu.tr/upload/12612993/index.pdf
https://hdl.handle.net/11511/20356

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

An approach on dilution and ore recovery / loss calculations in minearal reserve estimations at the Cayeli mine, Turkey Soyer, Nihat; Güyagüler, Tevfik; Department of Mining Engineering (2006) Dilution and ore recovery/loss have an important role in calculation of mineral reserves. Each percent increase in dilution and decrease in recovery negatively affects economic value of the reserve. These parameters are mainly controlled by the quality of the mine design and stoping practice. This study provides an approach developed for dilution and recovery/ore loss calculations. The contribution of mine design software (MineSight) and the recent survey technique called Cavity Monitoring System (CMS) were...
Review of Trend Tests for Detection of Wear Out Period for Mining Machineries Gölbaşı, Onur; Demirel, Nuray (2015-04-17) Machinery systems are extensively utilized in all mining stages from beginning to end of ore production. They are capital-intensive systems and substantial amount of money is spent annually to keep their functionalities in desired levels. Therefore, implementation of effective maintenance strategy has a vital importance to prevent unexpected breakdowns due to failures and to minimize operational cost. These maintenance strategies can be constituted effectively regarding functional and structural dependencie...
Determination of optimum overall slope angle for an open pit iron mine Akdağ, Selahattin; Başarır, Hakan; Department of Mining Engineering (2015) Currently, vast majority of the mineral extraction is conducted by open pit mining operations. With the improvements in mining industry, mines have become progressively deeper leading to slope stability problems. Therefore, slope stability assessment has gained more significance for geotechnical engineering. Moreover, deepening the open pit mines has revealed the necessity of designing optimized slopes with regard to the economic viability. Steepening the ultimate slope of an open pit as much as possible mi...
Development of a ventilation model for the g field of Çayırhan coal mine İnan, Cem; Güyagüler, Tevfik; Department of Mining Engineering (2005) Ventilation problems raised with the beginning of underground mining. In underground mining, to provide safe and healthy working conditions, ventilation should be designed properly. Especially in the planning stage of the project, to design ventilation properly is very important. The latest upgrade of the popular ventilation simulation program, known as VnetPC 2000, has been applied for the ventilation design. In this study simulation is conducted to both auxiliary and main ventilation at Çayirhan G Field. ...
Investigation of bit hydraulics for gasified drilling fluids Doğan, Hüseyin Ali; Özbayoğlu, Mehmet Evren; Department of Petroleum and Natural Gas Engineering (2004) Accurate determination of the pressure losses at the bit is very important for drilling practices in petroleum industry. In the literature, there are several studies on determination of the pressure losses. Major focus is concentrated on single phase drilling fluids, which is far from accurate estimation of pressure losses for multiphase fluids, i.e., fluids including a liquid and a gas phase, at the bit. Some of these models are valid for multiphase fluids, however, they are either valid for very high gas ...

Citation Formats

O. Gölbaşı, “Investigation of stress distribution in a dragline bucket using finite element analysis,” M.S. - Master of Science, Middle East Technical University, 2011.