Ömer KELEŞ

Full Professor

Address: Gazi University, Faculty of Engineering, Department of Mechanical Eng.
Telephone: +90 312 5823413
Fax: +90 312 2308434
E-mail: omer@gazi.edu.tr
Nationality: Turkish

WORK EXPERIENCE

Dates (from – to)
2020-present
Name and address of employer
TEI, TUSAŞ Engine Industries Inc., Eskişehir, TURKEY
Type of business or sector
Occupation or position held
Member of Board of Director
Main activities and responsibilities
Dates (from – to)
2017-2018
Name and address of employer
SSTEK Savunma Sanayi Teknolojileri A.Ş., Ankara, TURKEY
Type of business or sector
Occupation or position held
Member of Board of Director
Main activities and responsibilities
Dates (from – to)
2017-2017
Name and address of employer
The Scientific and Technological Research Council of TURKEY
Type of business or sector
Occupation or position held
Member of TEYDEB Advisory Board
Main activities and responsibilities
Dates (from – to)
2016-2020
Name and address of employer
Gazi University, Faculty of Engineering, Ankara, TURKEY
Type of business or sector
Occupation or position held
Dean of Faculty of Engineering
Main activities and responsibilities
Dates (from – to)
2015-2017
Name and address of employer
Undersecretariat of Defense Industry, Ankara, TURKEY
Type of business or sector
Occupation or position held
Member of Advisory Board
Main activities and responsibilities
Dates (from – to)
2014-2016
Name and address of employer
The Scientific and Technological Research Council of TURKEY
Type of business or sector
Occupation or position held
Member of Science and Society Programs Advisory and Evaluation Board
Main activities and responsibilities
Dates (from – to)
2014-2016
Name and address of employer
Ministry of Science, Industry and Technology, Ankara, TURKEY
Type of business or sector
Occupation or position held
Member of SANTEZ Evaluation Comission
Main activities and responsibilities
Dates (from – to)
2014-2015
Name and address of employer
Journal of the Faculty of Engineering and Architecture of Gazi University (SCI-E)
Type of business or sector
Occupation or position held
Editor in Chief
Main activities and responsibilities
Dates (from – to)
2013-2016
Name and address of employer
Gazi University, Faculty of Engineering, Ankara, TURKEY
Type of business or sector
Occupation or position held
Member of Faculty Board of Faculty of Engineering
Main activities and responsibilities
Dates (from – to)
2013-present
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Full Professor
Main activities and responsibilities
Dates (from – to)
2007-2013
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Associate Professor
Main activities and responsibilities
Dates (from – to)
2006-2007
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Assistant Professor
Main activities and responsibilities
Dates (from – to)
2002-2006
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Instructor, PhD.
Main activities and responsibilities
Dates (from – to)
1999-1999
Name and address of employer
University of Wisconsin, Madison, USA
Type of business or sector
Occupation or position held
Visiting Researcher
Main activities and responsibilities
Dates (from – to)
1998-2002
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Research Assistant, PhD.
Main activities and responsibilities
Dates (from – to)
1995-1996
Name and address of employer
Northeastern University, Boston, USA
Type of business or sector
Occupation or position held
Visiting Researcher
Main activities and responsibilities
Dates (from – to)
1990-1998
Name and address of employer
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Type of business or sector
Occupation or position held
Research Assistant
Main activities and responsibilities

EDUCATION AND TRAINING

Dates (from – to)
1985-1989
Name and type of organization providing education and training
Gazi University, Faculty of Engineering, Department of Mechanical Eng., Ankara, TURKEY
Principal subjects/occupational
Title of qualification awarded
BSc., Mechanical Engineer
Dates (from – to)
1989-1992
Name and type of organization providing education and training
Gazi University, Graduate School of Natural and Applied Sciences, Department of Mechanical Eng.
Principal subjects/occupational
Title of qualification awarded
MSc.
Dates (from – to)
1992-1998
Name and type of organization providing education and training
Gazi University, Graduate School of Natural and Applied Sciences, Department of Mechanical Eng.
Principal subjects/occupational
Title of qualification awarded
PhD.

PERSONAL SKILLS AND COMPETENCES

MOTHER TONGUE
Turkish
OTHER LANGUAGES
English
Reading skills
Writing skills
Verbal skills
SOCIAL SKILLS AND COMPETENCES
Living and working with other people, in multicultural environments, in positions where communication is important and situations where teamwork is essential (for example culture and sports), etc.
Test
ORGANIZATIONAL SKILLS AND COMPETENCES
Coordination and administration of people, projects and budgets; at work, in voluntary work (for example culture and sports) and at home, etc.
TECHNICAL SKILLS AND COMPETENCES
With computers, specific kinds of equipment, machinery, etc.
OTHER SKILLS AND COMPETENCES
Competencentioned above.
DRIVING LICENSE(S)

AUTHORED OR CO-AUTHORED ARTICLES

ARTICLES IN BOOK CHAPTERS B.S. Yilbas, S. Akhtar, O. Keles, Chapter 8: “Laser straight cutting of Ti-6Al-4V alloy: Temperature and stress fields”, Materials and Surface Engineering: Research and development, edited by J. Paulo Davim, ISBN-13: 9780857091512, Woodhead Publishing, pp 241-262, 2012.

B.S. Yilbas, S. Akhtar, O. Keles, Chapter 5: “Laser Cutting a Small Diameter Hole: Thermal Stress Analysis”, Lasers in Manufacturing, edited by J. Paulo Davim, ISBN: 978-184821369-2, John Wiley and Sons, pp 179-202, 2012.

B.S. Yilbas, S. Akhtar, O. Keles, Chapter 3: “CO2 Laser Cutting of Triangular Geometry in Aluminum Foam”, Nontraditional Machining Processes: Research advances, edited by J. Paulo Davim, ISBN-13: 9781447151784, Springer, pp 97-110, 2013.

ARTICLES IN PEER REVIEWED JOURNALS 1. KELES O., ERCAN, Y., “Theoretical and Experimental Investigation of a Pulse-width Modulated Digital Hydraulic Position Control System”, Control Engineering Practice, vol 10/6, pp 645-654, 2002.

2. KELES O., “Thermal Stress Development and Entropy Change During Laser Pulse Heating of a Steel Surface”, Lasers in Engineering, vol. 15 pp. 179-196, 2005.

3. KARATAS C., KELES O., USLAN I., USTA Y., “Laser Cutting of Steel Sheets: Influence of Workpiece Thickness and Beam Waist Position on Kerf Size and Stria Formation”, Journal of Materials Processing Technology, vol. 172, pp. 22-29, 2006.

4. YILBAS B.S., KARATAS C., KELES O., USLAN I., USTA Y., AHSAN M., YILBAS Z., “Laser Cutting of Corners: Assessment of Cutting Quality”, Lasers in Engineering, vol. 16 pp. 157-171, 2006.

5. YILBAS B.S., KHALED M., KARATAS C., USLAN I., KELES O., USTA Y., AHSAN M., “Electrochemical Properties of The Laser Nitrided Surfaces of Ti-6Al-4V Alloy”, Surface & Coatings Technology, vol. 201/3-4, pp. 679-685, 2006.

6. YILBAS B.S., KARATAS C., USLAN I., KELES O., USTA Y., AHSAN M., “Laser Gas Assisted Nitriding of TI-6AL-4V Alloy”, Applied Surface Science, vol. 252/24, pp. 8557-8564, 2006.

7. AL-SULAIMAN F., YILBAS B.S., KARATAS C., KELES O., USLAN I., USTA Y., AHSAN M., BAZOUNE A., “Laser Cutting of Kevlar and Mild Steel Composite Structure: End Product Quality Assessment”, Journal of Materials Engineering and Performance, vol. 16 (1), pp. 22-29, 2007.

8. B.S. YILBAS, C. KARATAS, I. USLAN, O. KELES, Y. USTA, Z. YILBAS, M. AHSAN, "Wedge Cutting of Mild Steel by CO2 Laser and Cut-Quality Assessment in Relation to Normal Cutting", Optics and Lasers in Engineering, vol 46, pp 777-784, 2008.

9. Mustafa Ubeyli, Teyfik Demir, Huseyin Deniz, R. Orhan Yıldırım, Omer Keles, “Investigation on the ballistic performance of a dual phase steel against 7.62mm AP projectile”, Materials Science and Engineering A, vol 527, pp 2036–2044, 2010.

10. M. Sunar, O. Keles, “Magnetostrictive Actuator Modeling and Placement”, Advanced Materials Research, vol. 83-86, pp 281-288, 2010.

11. B. S. Yilbas, S. Khan, K. Raza, O. Keles, M. Ubeyli, T. Demir, M. S. Karakas, “Laser cutting of 7050 Al alloy reinforced with Al2O3 and B4C composites”, Int. J. Advanced Manufacturing Technology, vol. 50, pp 185-193, 2010.

12. O. KELES, U. ONER, “A Study of the Laser Cutting Process: Influence of Laser Power and Cutting Speed on Cut Quality”, Lasers in Engineering, vol. 20/5-6, pp. 319-327, 2010.

13. M. Ubeyli, H. Deniz, T. Demir, B. Ogel, B. Gurel, O. Keles, “Ballistic impact performance of an armor material consisting of alumina and dual phase steel layers”, Materials and Design, vol. 32, pp 1565-1570, 2011.

14. M. Übeyli, A. Acır, Ö. Keleş, C. E. Akçay, “Effect of cutting parameters on cutting force and surface roughness in milling alumina reinforced Al-6Zn-2Mg-2Cu composites”, Powder Metallurgy, vol. 54/2, pp. 172-176, 2011.

15. I. Uslan, S. Erdogan, O. Keles, Y. Usta, B.S. Yilbas, B. Tuc, “Experimental Investigation of Laser-Drilled Holes Variations Depending on Laser Drilling Parameters”, Advanced Materials Research, vol. 445, pp 448-453, 2012.

16. Omer Keles, Ufuk Oner, “Laser Cutting Process: Influence of Workpiece Thickness and Laser Pulse Frequency on The Cut Quality”, The Arabian Journal for Science and Engineering, vol. 37, pp. 2277-2286, 2012.

17. R. O. UZUN, Ö. KELEŞ, “Lazerle Kaynak İşleminde Kaynak Parametrelerinin Kaynak Kalitesi Üzerindeki Etkilerinin İncelenmesi”, Journal of The Faculty of Engineering and Architecture of Gazi University, vol. 37, pp. 2277-2286, 2012.

18. B.S. Yilbas, S.S. Akhtar, O. Keles, "Laser Hole Cutting in Aluminum Foam: Influence of Hole Diameter on Thermal Stress", Optics and Lasers in Engineering, Vol. 51, pp. 23-29, 2013.

19. B.S. Yilbas, S.S. Akhtar, O. Keles, “Laser Cutting of Triangular Geometries in Aluminum Foam: Effect of Cut Size on Thermal Stress Levels”, Optics & Laser Technology, vol. 48, pp. 523-529, 2013.

20. Bekir Sami Yilbas, S.S. Akhtar, Omer Keles, "Laser Cutting of Aluminum Foam: Experimental and Model Studies", ASME Journal of Manufacturing Science and Engineering, vol. 135/5, Article Number: 051018, 2013.

21. Bekir Sami Yilbas, Sohail Akhtar, Omer Keles, “Laser Cutting of Large Diameter Holes into Aluminum Foam”, Machining Science and Technology, vol. 17/4, pp. 524-544, 2013.

22. Bekir Sami Yilbas, Sohail Akhtar, Omer Keles, “Laser cutting of triangular blanks from thick aluminum foam plate: Thermal stress analysis and morphology”, Applied Thermal Engineering, vol. 62, pp. 28-36, 2014.

23. Mustafa Übeyli, Erhan Balci, Bertan Sarikan, M. Kemal Öztaş, Necip Camuşcu, R. Orhan Yıldırım, Ömer Keleş, “The ballistic performance of SiC–AA7075 functionally graded composite produced by powder metallurgy”, Materials and Design, vol. 56, pp. 31-36, 2014

24. Sohail Akhtar, Omer Ozgur Kardas, Omer Keles, Bekir Sami Yilbas, “Laser cutting of rectangular geometry into aluminum alloy: Effect of cut sizes on thermal stress field”, Optics and Lasers in Engineering, vol. 61, pp. 57-66, 2014.

25. Omer Ozgur Kardas, Omer Keles, Sohail Akhtar, Bekir Sami Yilbas, “Laser cutting of rectangular geometry in 2024 aluminum alloy: Thermal stressanalysis”, Optics & Laser Technology, vol. 64, pp. 247-256, 2014.

26. B. S. Yilbas, S. S. Akhtar, O. Keles, “Laser cutting of small diameter hole in aluminum foam”, Int. J. Adv. Manuf. Technol., vol. 79, pp. 101–111, 2015.

27. B. S. Yilbas, S. S. Akhtar, O. Keles, “Laser cutting of triangular geometry into 2024 aluminum alloy: Influence of triangle size on thermal stress field”, Journal of Mechanical Science and Technology., vol. 29, pp. 3239-3248, 2015.

28. Bekir Sami Yilbas, Omer Keles, Abdurrahman Yagmur Toprakli, “Surface engineering towards self-cleaning applications: Laser textured silicon surface”, Procedia Engineering, vol. 184, pp. 716-724, 2017.

29. Ahmadzadeh S., Keles O., Camuscu N., “Effect of Equal Channel Angular Pressing on Microstructure and Mechanical Properties of Aluminum Based Composite Materials”, Gazi University Journal of Science, vol. 30/3, pp. 51-61., 2017.

30. T. Turkucu, O. Keles, “Magneto-Rheological Engine Mount Design and Experimental Characterization”, Journal of Mechanical Science and Technology, vol. 32/11, pp. 5171-5178, 2018.

31. Omer Keles, S.Z. Shuja, Bekir Sami Yilbas, H. Al-Qahtani, G. Hassan, A.Y..Adesina, Ali Rinaldi, M Khaled and Abdullah Al-Sharafi, “Additive manufacturing of Ti-alloy: Thermal analysis and assessment of properties”, Advances in Mechanical Engineering, vol. 12(6), pp. 1-12, 2020.

CONFERENCES AND SYMPOSIUMS 1. YILBAS B.S., KARATAS C., USLAN I., KELES O., USTA Y., AHSAN M., “Wedge Cutting of Mild Steel By CO2 Laser and Cut Quality Assessment”, International Symposium on Measurement and Evaluation (ISME), Malaysia, 2006.

2. M. SUNAR, O. KELES, "Magnetostrictive Actuator Modeling and Placement", The International Conference on Advances in Materials and Processing Technologies, Bahrain, 2008.

3. Omer Keles, Ufuk Oner, “Laser Cutting Process: Influence of Laser Power Setting and Cutting Speed of The Cut Quality”, The International Conference on Advances in Materials and Processing Technologies, Malaysia, 2009.

4. Omer Keles, Ufuk Oner, “Laser Cutting Process: Influence of Workpiece Thickness and Laser Pulse Frequency on The Cut Quality”, The International Conference on Advances in Materials and Processing Technologies, Turkey, 2011.

5. I. Uslan, S. Erdogan, O. Keles, Y. Usta, B.S. Yilbas, B. Tuc, “Experimental Investigation of Laser-Drilled Holes Variations Depending on Laser Drilling Parameters”, The International Conference on Advances in Materials and Processing Technologies, Turkey, 2011.

6. Bertan SARIKAN, M. Kemal ÖZTAŞ, Erhan BALCI, Mustafa ÜBEYLİ, Necip CAMUŞÇU, Ömer KELEŞ, “Yapay Yaşlandırmanın SiC ve 7075 Alüminyum Alaşımı İçeren Bir İşlevsel Dereceli Malzemenin Sertliği Üzerine Etkisi”, 6. Uluslararası Toz Metalurjisi Konferansı, Ankara, 2011.

7. Öztas M.K., Sarıkan B., Übeyli M., Camuscu N., Keles Ö. "Production of the functionally gradient material based on an aluminum alloy", The eleventh international scientifically-practical conference, Saint Petersburg, Russian Federation, 2011.

8. Omer Keles, Bekir Sami Yilbas, “Laser Cutting of Light Weight Aluminum Honeycomb Panel”, The International Conference on Advances in Materials and Processing Technologies, Taiwan, 2013.

9. Saman Ahmadzadeh, Necip Camuşçu, Ömer Keleş, “The Effect of Equal Channel Angular Pressing (ECAP) and Mg Addition on the Microstructure and Mechanical Properties of Al/SiCp Composites”, 7. Uluslararası Toz Metalurjisi Konferansı, Ankara, 2014.

10. Omer Keles, Bekir Sami Yilbas, “Laser Cutting of 2024 Aluminum Alloy and Cutting Quality Assessment”, The International Conference on Advances in Materials and Processing Technologies, Dubai, 2014.

11. Tamer Turkucu, Omer Keles, “An Experimental Study of MR Engine Mount”, 14th Int. Conf. on Electrorheological Fluids and Magnetorheological Suspensions, Spain, 2014.

12. Bekir Sami Yilbas, Omer Keles, Abdurrahman Yagmur Toprakli, “Surface engineering towards self-cleaning applications: Laser textured silicon surface”, The International Conference on Advances in Materials and Processing Technologies, Kuala Lumpur, 2016.

13. Murat AVCI, Özer TAGA, Fatih KOŞAR, Ömer KELEŞ, “Katlanır Kapak Mekanizmasının Sürtünme ve Sönüm Katsayısının Deneysel ve Sayısal Çalışmalara göre Belirlenmesi”, 3rd International Conference on Computational and Experimental Science and Engineering, Antalya, 2016.

14. Nail KAYA, Emre OKUR, Halit Erdem NAKKAŞ, Fatih KOŞAR, Ömer KELEŞ, “Havacılık Sistemlerinde Kullanılan Baskı Devre Kartları ve Bileşenlerinin Titreşim ve Yorulma Analizi”, 3rd International Conference on Computational and Experimental Science and Engineering, Antalya, 2016.

15. Yilmaz I., Taga O., Kosar F., Keles O., “Determination of Friction and Damping Coefficients of Folded Cover Mechanism Deployed by Torsion Springs”, 19th International Conference on Engineering Systems Design and Analysis, San Francisco, 2017.

16. Bekir Sami Yilbas, Omer Keles, Abdurrahman Yagmur Toprakli, H. Ali, A. Al-Sharafi, “Laser Texturing of Tungsten Surface for Enhanced Solar Absorption: Potentials on Sustainable Architecture”, The International Conference on Advances in Materials and Processing Technologies, Chennai, 2017.

17. Aydogan C.S., Hatipoglu H.A., Keles O., “Springback Prediction of CP2 Titanium Sheets in Hydroforming with Membrane Diaphragm Process with Finite Element Method”, 5th International Conference on New Forming Technology, Bremen, 2018.

18. O. Keles, D. Kilic, G. Abdelmagid, A.Y. Adesina, A.R. Bin Anand, M. Khaled, A. Al-Sharafi, B.S. Yilbas, “Additive Manufacturing of Layer of Ti6Al4V alloy: Morphology and Metallurgical Properties”, The International Conference on Advances in Materials and Processing Technologies, Dublin, 2018.

19. Levent Urtekin, Ömer Keleş, “Investigation of Mechanical Properties of TiN Coating of Ti-6Al-4V Alloys”, The Internatinonal Conference on Materials Science Mechanical and Automation Engineerings and Technology, İzmir, 2018.