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.
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)