Assoc. Prof. Dr. Yiğit Karpat

 

Bilkent University

Department of Industrial Engineering

Bilkent, Ankara, TURKEY 06800

Phone: +90 312 290 22 63

Email: ykarpat@bilkent.edu.tr

 

Personal homepage

http://staff.bilkent.edu.tr/yigitkarpat

 

Dual Appointment with Department of Mechanical Engineering

http://me.bilkent.edu.tr/?page_id=876&nvaf_id=46&lang=en

 

EDUCATION

 

    B.S. Dokuz Eylul University, Mechanical Eng. (1996)

    M.S. Middle East Technical University, Mechanical Eng. (2000)

    Ph.D. Rutgers University, Industrial Eng. (2007)

 

CURRENT RESEARCH TOPICS

 

-Modeling of process material interaction using physics based analytical and computational methods

-Design and fabrication of polycrystalline diamond (PCD) micro cutting tools,

-Machining of difficult-to-cut materials such as carbon fiber reinforced polymers, titanium alloys, silicon, and glass,

-Ultra precision machining of freeform optics,

-Micro stereo-lithography based additive manufacturing.

 

Google Scholar

 

PUBLICATIONS

 

21. S. Oliaei, Y. Karpat, "Influence of Tool Wear on Machining Forces and Tool Deflections during Micro Milling", International Journal of Advanced Manufacturing, (DOI: 10.1007/s00170-015-7744-4)

 

20. S. Zeinali, B. Çetin, S. Oliaei, Y. Karpat, "Fabrication of continuous flow microfluidics device with 3D electrode structures for high throughput DEP applications using mechanical machining", Electrophoresis 03/2015; DOI:10.1002/elps.201400486

 

19. Y. Karpat, B. Değer, O. Bahtiyar, B. Kaftanoğlu, “A Mechanistic Approach to Investigate Drilling of UD-CFRP Laminates with PCD Drills”, CIRP Annals – Manufacturing Technology, Volume 63, 2014.

 

18. S.N.B. Oliaei, C. Özdemir, Y. Karpat, “Fabrication of Micro Ball End Mills Using Micro Electro Discharge Machining”, Special Issue on: "7th International Conference on Design and Production of Dies and Molds "Recent Advances in Manufacturing Technology," Int. J. of Mechatronics and Manufacturing Systems, in press.

 

17. Y.Karpat, B. Değer, O. Bahtiyar, “Experimental Evaluation of Polycrystalline Diamond Tool Geometries while Drilling Carbon Fiber Reinforced Plastics”, International Journal of Advanced Manufacturing Technology, Volume 71, Issue 5, 1295-1307, 2014.

 

16. Y.Karpat, N. Polat, "Mechanistic Force Modeling for Milling of Carbon Fiber Reinforced Polymers with Double Helix Tools", CIRP Annals- Manufacturing Technology, Volume 62, 95-98, 2013.

 

15. Y.Karpat, B. Değer, O. Bahtiyar, “Drilling Thick Fabric Woven CFRP Laminates with Double Point Angle Tools”, Journal of Materials Processing Technology, Volume 212, 2117-2127, May 2012.

 

14. Y.Karpat, B. Değer, O. Bahtiyar, “Mechanistic Force Modeling for Milling of Unidirectional Carbon Fiber Reinforced Polymer Laminates, International Journal of Machine Tools and Manufacture, Volume 56, 79-93, May 2012.

 

13. Y. Karpat, “Temperature Dependent Flow Softening of Titanium Alloy Ti6Al4V: An Investigation Using Finite Element Simulation Of Machining”, Journal of Materials Processing Technology, Volume 211, Issue 4, pp 737-749, April 2011.

 

12. Y. Karpat, “A Modified Material Model for the Finite Element Simulation of Machining Titanium Alloy Ti6Al4V”, Machining Science and Technology, Vol. 14, Issue 3, pp 390-410, 2010.

 

11. Y.Karpat, “Investigation of the Effect of Cutting Tool Edge Radius on Material Separation due to Ductile Fracture in Machining”, International Journal of Mechanical Sciences, Vol. 51, Issue 7, pp 541-546, 2009

 

10. T. Özel, Y. Karpat, and A. Srivastava, "Hard Turning with Variable Micro-Geometry PcBN Tools," CIRP Annals-Manufacturing Technology, Vol. 57 pp. 73-76, 2008.

 

9. Y. Karpat and T. Özel, "Process Simulations for 3-D Turning using Uniform and Variable Micro-Geometry PcBN Tools," International Journal of Machining and Machinability of Materials, Vol. 3. No. 3, 2008.

 

8. Y. Karpat and T. Özel, “Analytical and Thermal Modeling of High-Speed Machining with Chamfered Tools,” ASME Journal of Manufacturing Science and Engineering, Vol. 130, 2008.

 

7. Y. Karpat and T. Özel, "Mechanics of High Speed Cutting with Curvilinear Edge Tools," International Journal of Machine Tools and Manufacture, Vol 48, pp. 195-208, 2008

 

6. T. Özel, Y. Karpat, L. Figueira and J. P. Davim, "Modeling of Surface Finish and Tool Wear in Hard Turning of AISI D2 Steel Using Ceramic Wiper Inserts," Journal of Materials Processing Technology, Vol 189, pp. 192-198, 2007

 

5. T. Özel, Y. Karpat, "Identification of Constitutive Material Model Parameters for High-Strain Rate Metal Cutting Conditions Using Evolutionary Computational Algorithms," Materials and Manufacturing Processes, Vol.22, pp. 656-667, 2007.

 

4. Y. Karpat and T. Özel, "Multi-Objective Optimization For Turning Processes Using Neural Network Modeling And Dynamic-Neighborhood Particle Swarm Optimization," International Journal of Advanced Manufacturing Technology, Vol. 35, No.3-4, November 2007, pp. 234-247.

 

3. Y. Karpat and T. Özel, “Predictive Analytical and Thermal Modeling of Orthogonal Cutting Process. Part II: Effect of Tool Flank Wear on Tool Forces, Stresses and Temperature Distributions,” ASME Journal of Manufacturing Science and Engineering, Vol. 128, pp 445- 453, 2006

 

2. Y. Karpat and T. Özel, “Predictive Analytical and Thermal Modeling of Orthogonal Cutting Process. Part I: Predictions of Tool Forces, Stresses and Temperature Distributions,” ASME Journal of Manufacturing Science and Engineering, Vol. 128, pp 435-444, 2006

 

1. T. Ozel, Y. Karpat, “Predictive Modeling of Surface Roughness and Tool Wear in Hard Turning using Regression and Neural Networks”, International Journal of Machine Tools and Manufacture, Vol. 45, pp 467-479, 2005.

 

 

CONFERENCE PUBLICATIONS

 

36. Z. Ali, E. B. Türeyen, Y. Karpat, M. Çakmakcı, " Fabrication of Polymer Micro Needles for Transdermal Drug Delivery System using DLPbased Projection Stereo-lithography" 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII), Tokyo, Japan.

 

35. Samad Nadimi Bavil Oliaei, Yigit Karpat, " Fabrication of PCD Mechanical Planarization Tools by using μ-Wire Electrical Discharge Machining" 18th CIRP Conference on Electro Physical and Chemical Machining (ISEM XVIII), Tokyo, Japan.

 

34. Y. Karpat, O. Bahtiyar, "Cutting Power based Investigation of Process Parameters while Drilling Carbon Fiber Reinforced Polymers", CIRP HPC 2016, Chemnitz, Germany.

 

33. E.B. Türeyen, Y. Karpat and M. Çakmakcı, "Development of an Iterative Learning Controller for Polymer based Micro-Stereolithography Prototyping Systems", 2016 American Control Conference, Boston, USA.

 

32. Y. Karpat, O. Bahtiyar, "Helisel Çok Kristalli Elmas Matkaplar ile Karbon Fiber Takviyeli Polimer Levhaların Delinme İşleminin İncelenmesi", 6. Ulusal Talaşlı İmalat Konferansı, Kasım 2015, İstanbul, Türkiye

 

31. E. B. Türeyen, Z. Ali, Y. Karpat, M. Çakmakcı, "Fabrication of High Aspect Ratio Polymer Structures Using A Digital Micro Mirror Device Based Stereo Lithography Technique", 8th International Conference and Exhibition on Design and Production of MACHINES and DIES/MOLDS, 2015, Aydin, Turkey.

 

30. S. N. B. Oliaei, Y. Karpat, An Investigation of Ductile Regime Machining of Fused Silica Glass Using PCD Micro Tools", 8th International Conference and Exhibition on Design and Production of MACHINES and DIES/MOLDS, 2015, Aydin, Turkey

 

29. Y. Karpat, O. Bahtiyar, "Comparative analysis of PCD drill designs during drilling of CFRP laminates", abstract accepted for 15th CIRP Conference on Modelling of Machining Operations, Karlsruhe, Germany, 2015.  

 

28. S.N.B. Oliaei, Y.Karpat, “Experimental Investigations on Micro Milling of Stavax Stainless Steel”, CIRP High Performance Cutting Conference, 2014, Berkeley, USA

 

27. Y. Karpat, O. Bahtiyar, “Experimental Investigation of Double Point Angle Polycrystalline Diamond Drill Geometries”, 16th International Conference on Machine Design and Production, 2014, İzmir, Turkey

 

26. O.M.Bircan, M.A. Güler, Y. Karpat, “An Analytical Approach to Design Accurate Profile of the Form-Turning Inserts”, 7th International Advanced Technologies Symposium (IATS’13), 30 October-1 November 2013, Istanbul, Turkey

 

25. S.N.B. Oliaei, C. Özdemir, Y.Karpat, "Fabrication of Micro Ball End Mills Using Micro Electro Discharge Machining", 7th International Conference And Exhibition on Desing and Production of Machines and Dies/Molds, June 2013, Antalya, TURKEY.

 

24. A. Ergür, S.N.B. Oliaei, Y.Karpat, “Design and Fabrication of Micro Cutting Tools Using Micro Electro Discharge Machining (µ-EDM)”, 15th International Conference on Machine Design and Production, 2012, Denizli, Turkey

 

23. S.N.B. Oliaei, Y. Karpat, “Multi Scale Milling Force Modeling through a Finite Element Simulation Based Metamodel”, 15th International Conference on Machine Design and Production, 2012, Denizli, Turkey

 

22. Y. Karpat, B. Değer, O. Bahtiyar, “Mechanistic Force Modeling for Milling of Unidirectional Carbon Fiber Reinforced Polymer (CFRP) Laminates”, 5th CIRP Conference on High Performance Cutting, Zurich, June 2012.

 

21. E. Azemi, E. Korkmaz, Y. Karpat, S. Filiz, "Micromachining of PMMA and PLGA Polymer Micro Needles for Medical Applications", 6th International Conference on MicroManufacturing (ICOMM), March 7-10, 2011, Tokyo, Japan

 

20. A. Çelik, I. Lazoglu, Y. Karpat, F. Kara, A. Kara, “Cutting Performance of SiAlON Based Ceramic Materials”, The 3rd International Congress on Ceramics (ICC3), Osaka, Japan November 2010-Poster Pres.

 

19. N. Camuscu, Y. Karpat, A. Kılıç, B. Değer, F. Sonat, O. Bahtiyar, “Örgü Karbon Elyaf Takviyeli Polimer Malzemelerin Karbür Takımlarla Delinmesi”, 2.Ulusal Talaşlı İmalat Sempozyumu, Selcuk Üniversitesi, 1-2 Ekim 2010, Konya.

 

18. Y.Karpat, N. Camuscu, A. Kılıç, B. Değer, F. Sonat, O. Bahtiyar,” Drilling Carbon Fiber Reinforced Plastics with Diamond Coated Carbide Tools”, 36th Matador Conference, Manchester, UK, 2010.

 

17. E. Korkmaz, Y. Karpat, S. Filiz, “Recent Developments in Micro Machining Technologies”, 14th International Conference on Machine Design and Production, 2010, Cyprus, TRNC

 

16. Y.Karpat, “Temperature Dependent Flow Softening of Titanium Alloy Ti6AL4V: An Investigation Using Finite Element Modeling of Machining”, 14th International Conference on Machine Design and Production, 2010, Cyprus, TRNC

 

15. Y.Karpat, N. Camuscu, A. Kılıç, B. Değer, F. Sonat, O. Bahtiyar,” Drilling Carbon Fiber Reinforced Plastics with Diamond Coated Carbide and Polycryrstalline Diamond Cutting Tools”, 14th International Conference on Machine Design and Production, 2010, Cyprus, TRNC

 

14. Y. Karpat, “Titanyum Alaşımı Ti-6Al-4V Malzemesinin Dik Kesilmesi Esnasında İşlem Değişkenlerinin En Az Enerji Temelli Bir Model ile Hesaplanması”, 1.Ulusal Talaşlı İmalat Sempozyumu, Yıldız Üniversitesi, 2-3 Ekim 2009, İstanbul

 

13. İ. Keleş, Y. Karpat, “Optimization of multi-pass turning operations using swarm intelligence”, 29th National Operations Research and Industrial Engineering Conference, June 2009.

 

12. Y.Karpat, “Finite Element Simulation of Machining Titanium Ti-6Al-4V Alloy”, 5th International Conference And Exhibition on Desing and Production of Machines and Dies/Molds, June 2009, Kusadasi, Aydin, TURKEY.

 

11. Y.Karpat, “Finite Element Modeling of Machining Titanium Alloy Ti-6Al-4V Using A Modified Material Model”, 12th CIRP Conference on Modeling of Machining Operations, San Sebastian, Spain, May 2009.

 

10. Y.Karpat, “Investigation of Ductile Fracture Mechanics and Cutting Tool Edge Radius on The Size Effect in Machining”, 13th International Conference on Machine Design and Production, 2008, Istanbul, Turkey.

 

9. Y. Karpat and T. Özel, “Identification of Friction Factors for Chamfered and Honed Tools Through Slip-Line Field Analysis”, 2006 ASME Conference on Manufacturing Science and Engineering. October 8-11, 2006, Ypsilanti, Michigan

 

8. Y. Karpat and T. Özel “3-D FEA of Hard Turning: Investigation of PCBN Cutting Tool Micro-Geometry Effects” Transactions of North American Manufacturing Research Institute Vol. XXXV, 2007.

 

7. Y. Karpat and T. Özel, “An Integrated Analytical Thermal Model For Orthogonal Cutting With Chamfered Tools”, Transactions of North American Manufacturing Research Institute Vol. XXXIV, 2006.

 

6. Y. Karpat and T. Özel, “Swarm-Intelligent Neural Network System (SINNS) Based Multi-Objective Optimization of Hard Turning,” Transactions of North American Manufacturing Research Institute, Vol. XXXIV, pp. 9-16, 2006.

 

5. Y. Karpat and T. Özel, “Hard Turning Optimization Using Neural Network Modeling and Swarm Intelligence,” Transactions of North American Manufacturing Research Institute, Vol. XXXIII, 2005, pp. 179-186.

 

4. Y. Karpat and T. Özel, “An Analytical-Thermal Modeling Approach for Predicting Forces, Stresses and Temperatures in Machining with Worn Tools,” Proceedings of IMECE’05, 2005 ASME International Mechanical Engineering Congress & Exposition, Orlando, Florida, November 5-11, 2005.

 

3. Y. Karpat, E. Zeren, T. Özel, “Workpiece Material Model Based Predictions for Machining Processes”, Transactions of North American Manufacturing Research Institute, Vol. XXXIII, 2005.

 

2. T. Özel and Y. Karpat, "Predictive Modeling of Hard Turning Processes Using Neural Networks," CD Proceedings of 13th Industrial Engineering Research Conference (IERC), Extended Abstract, May 15-19, 2004, Houston, Texas.

 

1. T. Özel and Y. Karpat, "Prediction of Surface Roughness and Tool Wear in Finish Dry Hard Turning Using Back Propagation Neural Networks",  Proceedings of the 17th International Conference on Production Research  (ICPR), August 3-7, 2003, Blacksburg, Virginia

 

GRANTS

 

Finite Element Modeling of Machining of Titanium Alloy Ti6Al4V,

Funded by Tübitak 1002 between 01/09-01/10.

 

High Performance Machining of Carbon Fiber Reinforced Polymers,

Funded by TAI between 06/2010-06/2012.

 

Design and Fabrication of Polycrystalline Diamond Micro End Mills,

Funded by Tübitak 3501 between 04/2011-04/2014.

 

Nano Scale Machining of Brittle Materials with Nano-structured Diamond Tools

Funded by Tübitak 1001 between 2015-2017.

 

Development of Intelligent Miniature Machining Centers, (Dr. Sinan Filiz, PI)

Funded by Tübitak 1001, between 05/2010-05/2012

 

Development of Multi Purpose Micro Machining Center using Advanced Control Algorithms, (Dr. Melih Çakmakcı, PI),

funded by Tübitak 1001 between 10/2013-10/2015

 

Development of an Acoustical Vector Sensor,

Funded by Undersecretariat for Defense Industries between 09/2013-09/2015.

 

Micro System Design and Production Center,

Funded by Ministry of Development between 06/2010-06/2013. (http://me.bilkent.edu.tr/?page_id=2171)

 

MEMBERSHIPS  

 

American Society of Mechanical Engineering (ASME), since 2004.

Society of Manufacturing Engineering (SME), since 2004.

Operational Research Society, since 2007.

Mechanical Design and Production Society, since 2007.

CIRP- International Production Academy

EUSPEN- European Society of Precision Engineering

 

TEACHING

 

IE 262 Manufacturing Processes [Spring 2007-08-12, Fall 2009-10-11-12-13-14-15]

IE 271 Operations Analysis and Design [Fall 2007-08-09, Spring 2010-11-12-13-14-15]

IE 467 Emerging Trends in Manufacturing [Spring 2011, Fall 2011-12-13-14-15]

GE 401/402 (IE Dept. Advisor)