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Ozgur Keles, Ph.D.

Ozgur Keles
Senior Research Associate
Lecturer

Office: 

E1-253A

Fax: 

312.567.7230

Email: 

Education 

Ph.D., Materials Science and Engineering, Purdue University, 2013
M.S., Metallurgical and Materials Engineering, Middle East Technical University, 2008
B.S., Metallurgical and Materials Engineering, Middle East Technical University, 2005

Expertise 

Fracture, FEM, mechanical behavior, ceramics, pharmaceutical materials.

Research 

The main focuses of my research are:
(a) Shape memory ceramics: We are developing techniques to produce successful shape memory ceramics. One of my short-term goals is to advance manufacturing techniques such as gel-casting to control microstructure and improve the reliability of ceramics used in applications such as fuel cell, battery, filter, catalyst, as well as bone, cartilage and other tissue scaffolds.

(b) Fracture stochastics: I have been using the finite element method to understand stress evolution and fracture stochastics in brittle materials and functional ceramics like high electron mobility transistors. Here, the aim is to improve reliability of ceramics and to explain observed deviations from Weibull statistics.

(c) Pharmaceutical materials: We have been producing an extensive number of pharmaceutical tablets in our laboratory and are performing mechanical tests on the tablets. We are also working on ultrasonic characterization. I performed discrete element and finite element simulations to understand powder compaction and fracture behavior of tablets. My goal is to provide efficient tablet manufacturing routes for pharmacy industry by understanding the effects of porosity, compaction, powder size, tablet size, and testing techniques on fracture statistics of pharmaceutics.

Awards 

Graduate Excellence in Materials Science Sapphire Award, The American Ceramic Society, 2012

Tau Beta Pi, 2011

Professional Society Memberships 

Publications 

Ozgur Keles, R. Edwin Garcia, Keith J. Bowman, "Stochastic failure of isotropic, brittle materials with uniform porosity," Acta Materialia, Vol. 61 (2013) pp. 2853–2862.

Ozgur Keles, R. Edwin Garcia, Keith J. Bowman, "Deviations from Weibull statistics in brittle porous materials," Acta Materialia, Vol. 61 (2013) pp. 7207–7215.

Ozgur Keles, R. Edwin Garcia, Keith J. Bowman, "Pore-crack orientation effects on fracture behavior of brittle porous materials," International Journal of Fracture, Vol. 187 (2014) pp. 293–299.

Ozgur Keles, R. Edwin Garcia, Keith J. Bowman, "Modeling fracture behavior of porous glass," Journal of the American Ceramic Society, (2014) Accepted for publication.

Ozgur Keles, Nicholas P. Barcenas, Daniel H. Sprys, Keith J. Bowman, "Effect of porosity on Weibull statistics and fracture strength of microcrystalline cellulose tablets," International Journal of Pharmaceutics, (2014) Under review.

Ozgur Keles, Nicholas P. Barcenas, Daniel H. Sprys, Keith J. Bowman, "Effect of powder size and porosity on Weibull statistics and fracture strength of microcrystalline cellulose tablets," International Journal of Pharmaceutics, (2014) In preparation.