Ozgen Umit Colak

 

Yildiz Technical University

Department of Mechanical Engineering

ozgen@yildiz.edu.tr

colako@alum.rpi.edu

 

 

Education:

Doctor of Philosophy in Mechanical Engineering, Aug, 2001,              G.P.A.: 3.82 out of 4.00

Rensselaer Polytechnic Institute, Troy, NY

Master of Science in Mechanical Engineering, Dec, 1994                    G.P.A.: 3.60 out of 4.00

Yildiz Technical University, Istanbul, Turkey

Bachelor of Science in Mechanical Engineering, June, 1992               G.P.A.: 3.40 out of 4.00

Yildiz Technical University, Istanbul, Turkey

Thesis Work:

Modeling of Ratcheting, Cyclic Non-proportional Loading and Deformation Induced Anisotropy Using Viscoplasticity Theory Based on Overstress

Thesis Advisor:

Prof. Erhard Krempl, Department of Mechanical Engineering, Rensselaer Polytechnic Institute, Troy, NY

Academic Experience:

         Turkish Naval Academy, Istanbul, Turkey

         Lecturer                                                                                                Jan, 2003- June, 2003

·         ·         Conducting “Design of Machine Elements” course

 

University of Dogus, Istanbul, Turkey

Lecturer                                                                                                        Sept. 2002- 2007

·         ·         Conducting “Technical Drawing” courses using AutoCAD

 

         Rensselaer Polytechnic Institute, NY, USA                                             June 2002-Sept 2002

         Visiting Research Scholar

·         ·          Worked on the modeling of polymeric materials using a viscoplasticity theory

 

         Yildiz Technical University, Istanbul, Turkey

Lecturer                                                                                                             Oct. 2001 – present

·   ·   Conducting

·   ·   “Technical Drawing”

·   ·   “Selection of Materials in Mechanical Engineering”

·      “Machine Elements I, II” courses

 

University of Maryland, Baltimore County, MD

Research Associate                                                                                     April, 2001- Sept. 2001

·         ·         Worked on ‘Uniaxial and Multiaxial Response of a Polymer and a Particle Reinforced Polymer’

 for Naval Surface Warfare Center Indian Head, Maryland

·         ·         Worked on composite materials

 

Rensselaer Polytechnic Institute, Troy, NY

Research Assistant                                                                                      May, 1998 – April 2001

·   ·   Developed and implemented cyclic proportional and non-proportional loading using

viscoplasticity theory based on overstress

·   ·   Modeling of ratcheting under complex cyclic loading conditions

·   ·   Developed background in large deformation mechanics and plasticity models

 

Research Assistant                                                                                  Nov., 1997 – Feb., 1998

·   ·   Finite element meshing (PATRAN) and analysis (ABAQUS) of Wire Bonder (for Anorad Corporation)

 

         Yildiz Technical University, Istanbul, Turkey

Teaching Assistant, Design Division                                                  June, 1993 – August, 1996

·   ·   Conducted tutorial classes for element of machine design,

technical drawing courses and design techniques.

 

Finite Element Programs:

Experience with ANSYS, PATRAN and ABAQUS

 

Computer Skills:

Experience with UNIX and Windows operating systems

Experience with FORTRAN, AUTOCAD, SOLIDWORKS

Experience with mathematical analysis tools (i.e., MATLAB and Maple)

Publications:

Book:

A. Bozaci, I. Kosif and O. U. Colak, " Design of Machine Elements", Caglayan Press, Istanbul, Turkey, 2001, Second Edition.

 

A. International Publications (Journal Papers)

 

A14. Çolak, Ö.Ü, Kinematic hardening rules for modeling uniaxial and multiaxial ratcheting, Materials and Design.(in press).

 

A13. Düşünceli, N. ve Çolak, Ö. Ü., Modelling Effects of Degree of Crystallinity on Mechanical Behavior of Semicrystalline Polymers, International Journal of Plasticity, 2007, (in press)

 

A12. Düşünceli, N. ve Çolak, Ö. Ü., The Effects of Manufacturing Techniques on Visco-Elastic And Viscoplastic Behavior of High Density Polyethylene (HDPE), Materials and Design,  29:6, 1117-1124, 2008.

 

A11. Düşünceli, N. ve Çolak, Ö. Ü., High Denstiy Polyethylene (HDPE): Experiments and Modeling, Mechanics of Time Dependent Materials, 10: 331-345, 2006.

 

A10. Çolak Ö. ve Düşünceli N., Modeling viscoelastic and viscoplastic behavior of high density polyethylene (HDPE)’, Journal of Engineering Materials and Technology, Transactions of the ASME, 128, 572-578, 2006.

 

A9. Çolak, Ö. Ü.,Modeling Deformation Behavior Of Polymers With Viscoplasticity Theory Based On Overstress”, International Journal of Plasticity, 21, 145-160, 2005.

 

A8. Çolak, Ö. Ü.,Mechanical Behavior of PBXW-128 and PBXN-110 under Uniaxial and Multiaxial Compression at Different Strain Rates and Temperatures”, Journal of Testing and Evaluation, 32, 390-395, 2004.

 

A7. Khan, A., Çolak, Ö. Ü. ve Centala, P. “Compressive Failure Strength and Modes of Woven S2-glass Reinforced Polyester due to Quasi Static and Dynamic Loading”, International Journal of Plasticity, 18, 1337-1357, 2002.

 

A6. Çolak, Ö. Ü. ve Krempl, E.,Modeling of the Monotonic and Cyclic Swift Effects Using Isotropic Finite Viscoplasticity Theory Based on Overstress (FVBO)”, International Journal of Plasticity, 21, 3, 573-588, 2005.

 

A5. Çolak, Ö. Ü.,Modeling of Monotonic and Cyclic Swift Effect Using Anisotropic Finite Viscoplasticity Theory Based on Overstress (AFVBO): Part I – Constitutive Model”, International Journal of Solids and Structures, 41, 5301-5311, 2004.

A4. Çolak, Ö. Ü.,Modeling of Monotonic and Cyclic Swift Effect Using Anisotropic Finite Viscoplasticity Theory Based on Overstress (AFVBO): Part II –Numerical Experiments”, International Journal of Solids and Structures,41, 5313-5325, 2004

A3. Çolak, Ö. Ü.,Viscoplasticity Theory Applied To Proportional And Non-Proportional Cyclic Loading at Small Strains”, International Journal of Plasticity, 20, 8-9, 1387-1401, 2004.

 

A2. Çolak, Ö. Ü.,Modeling of Large Simple Shear Using A Viscoplastic Overstress Model and Classical Plasticity Model with Different Objective Stress Rates", Acta Mechanica, 167, 171-187, 2004.

 

A1. Çolak, Ö. Ü. ve Krempl, E.,Modeling of Uniaxial and Biaxial Ratcheting Behavior of CS 1026 Carbon Steel Using the Simplified Viscoplasticity Theory Based on Overstress (VBO)”, Acta Mechanica, 160, 27-44, 2003.

 

 

B.     International Conferences

 

B15. Çolak, Ö. Ü., and T. Hassan, Cyclıc Behavior Of Ultra High Molecular Weight Polyethylene (UHMWPE) and Modeling, Solid Mechanics 2008, Poland.

 

B14. Dusunceli, N., ve Çolak, Ö. Ü, Yüksek Yoğunluklu Polietilen’in Tek Eksenli Çekme Davranışının Belirlenmesi, 8. Uluslar arası Kırılma Konferansı, İstanbul, Türkiye, 7-9 Kasım 2007.

 

B13. Dusunceli, N., ve Çolak, Ö. Ü, Mühendislik Tasarımına Yönelik Polimerik Malzeme Modelleri, 12. Uluslar arası Makine Tasarımı ve İmalat Kongresi, 1-12, Kuşadası, Türkiye, Eylül, 5-7, 2006.

 

B12. Çolak, Ö. Ü., Kinematic Hardening Rules For Modeling Uniaxial And Multiaxial Ractheting, ASME Applied Mechanics and Materials Conference, Austin, Texas, ABD, Haziran 3-7, 2007.

 

B11. Dusunceli, N. ve Çolak, Ö.Ü., Experimental Characterization and Modelling of High Density Polyethylene (HDPE), ASME Applied Mechanics and Materials Conference, Austin, Texas, ABD, Haziran 3-7, 2007.

 

B10. Çolak, Ö. Ü. Influences of Objective Stress Rates On The Stress-Strain Behavior In Large Simple Shear, Proceeding of the 12th International Symposium on Plasticity ,Plasticity, Halifax, Kanada, 2006.

 

B9. Çolak, Ö. Ü. ve Düşünceli N. ‘Modeling cyclic behavior of high density polyethylene (HDPE)’ ASME International Mechanical Engineering Congress and Exposition, Kasım 2005, Orlando, Florida.

B8. Çolak, Ö. Ü.,Modeling Creep And Relaxation Behaviors Of Polyphenylene Oxide (PPO) Using A Viscoplasticity Theory”, ASME International Mechanical Engineering Congress and Exposition, Kasım 2005, Orlando, Florida.

B7. Düşünceli N. Ve Colak Ö. ‘Yüksek Yoğunluklu Polietilen’in (YYPE) Tek Eksenli Basma Yükleme-Boşaltma Davranışının Modellenmesi’, 7. Uluslar arası Kırılma Konferansı, 533-541, Kocaeli, 2005.

 

B6. Çolak, Ö. Ü. ve Krempl, E.,Modeling of The Swift Effect Using State Variable Theories”, Proceeding of the 10th International Symposium on Plasticity,Plasticity 2003,16-18, Quebec, Kanada, 2003.

B5. Çolak, Ö. Ü., Khan, F. ve Krempl, E., “Modeling the Deformation Behavior Of PPO Using The Viscoplasticity Theory Based On Overstress”, Proceeding of  the 10th International  Symposium on Plasticity, Plasticity 2003, 421-423, Quebec, Kanada, 2003.

 

B4. Çolak, Ö. Ü. ve Krempl, E. “Modeling of Uniaxial and Biaxial Ratcheting”, Proceedings of the 9th International  Symposium on Plasticity, Plasticity 2002, 477-479, Aruba, 2002.

 

B3. Çolak, Ö. Ü. ve Krempl, E.,Deformation Induced Anisotropy and the Modeling of The Swift Effect”, Proceedings of the 9th International Symposium on Plasticity, Plasticity 2002, 310-312, Aruba, 2002.

 

B2. Çolak, Ö. Ü. ve Krempl, E.,Viscoplasticity Theory Based on Overstress Applied to Cyclic Proportional and Non-proportional Loading”, Proceedings of the 8th International  Symposium on Plasticity, Plasticity 2000,333-335, Vancovour, Kanada, 2000.

 

B1. Çolak, Ö. Ü. ve Krempl, E.,"Cyclic Viscoplasticity and Deformation İnduced Anisotropy", Proceedings of the 36th Annual Meeting Society of Engineering Science,TA1-2, Austin, Texas, USA, 1999.

 

Honors:

Graduated with honors and ranked in the top 1%, Yildiz Technical University, Istanbul, Turkey, 1992

Graduate Scholarship by Turkish Government

 

Professional Organizations:

American Society of Mechanical Engineers, Member

Turkish Student Association at Rensselaer Polytechnic Institute, Troy, NY, President, 1999 - 2000.

Sigma Xi, Member

 

 Interests

            Jogging, hiking