Özgün Sunar

Özgün Sunar
Eskisehir Technical University · Railway Systems and Technologies

Doctor of Philosophy

About

12
Publications
1,875
Reads
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5
Citations
Introduction
Fatigue and fractures in OLE contact lines Experimental configurations to detect potential mechanical failures in contact lines
Additional affiliations
September 2013 - January 2016
Manisa Celal Bayar University
Position
  • Lecturer
Education
September 2016 - October 2020
The University of Sheffield
Field of study
  • Mechanical Engineering
January 2013 - January 2015
Manisa Celal Bayar University
Field of study
  • Mechanical Engineering
September 2008 - July 2012
Pamukkale University
Field of study
  • Mechanical Engineering

Publications

Publications (12)
Article
New laboratory-based test equipment is described for controlled arc exposure of short lengths of railway electrification contact wire (100 mm) enabling a rapid and low-cost experimental investigation of electric arc damage due to loss of contact between the pantograph and overhead line. The extreme local heating typical of arc sites is found to loc...
Thesis
Full-text available
Electrified trains are considered one of the most efficient ways of passenger and freight transportation. Recently, railway electrification has received particular attention due to its low carbon emissions. Around 40 % of the UK rail network is electrified and by 2050, it is expected that the share of electrified trains in total railway lines in th...
Article
Fatigue in railway overhead line electrification (OLE) contact wires can cause sudden catastrophic failures. The contact wire interacting with the pantograph both mechanically and electrically is subjected to tension and repetitive bending due to the pantograph contact force. Recently, fatigue failures of OLE have risen in prominence with increases...
Technical Report
Full-text available
This study provides new insight into damage to OLE contact wire subjected to arcs. Contact wire samples were extracted from an in-service OLE contact wire, cross-sectioned and analysed with optical microscopy and microhardness tests. The results show that the heat input from arcs influences the microstructure through modification to the metallurgic...
Conference Paper
Contact wire used to transmit the electric energy across the OLE in railway systems is a component that directly interacts with current collection apparatus, i.e. the pantograph of trains. The uplift force applied by the pantograph to ensure good current collection quality generates repetitive bending of the contact wire. In the past, wear life of...
Conference Paper
Full-text available
In this work, single parabolic leaf springs have been studied. The main goal is to develop a new method to minimize the number of prototypes and the testing period required to start mass production. The parameters affecting the fatigue life and the criteria for parabolic leaf spring design have been investigated before the determination of fatigue...
Conference Paper
Full-text available
Aluminum matrix composites are used commonly for their high mechanical properties, high thermal resistance and high wear resistance in composite materials. While process of Al matrix composite's welding, some difficulties may occur due to porosity and some problems of microstructure in weld metal. For this reason, according the core material a redu...

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