Title: Mechanical reliability of fused deposition modeled materials Date: Monday, July 30Time: 2:00pmLocation: NASA Ames N229/R215 Abstract: Additive manufacturing (AM) is increasingly used for space, defense, transportation, and consumer product applications. Among various AM techniques, fused deposition modeling (FDM) is most common one that can produce polymer, composite, metal, and ceramic materials. However, FDMed materials […]

S. Swaminathan, T. Shah, B. Sirkeci-Mergen, and O. Keles, “MachineLearning Models for Predicting Fracture Strength of Porous Ceramics and Glasses,” Proceedings of the 2018 International Conference on Data Science, (2018) pp. 147–150. Abstract – One of the crucial factors that determine the quality of a material is its ability to withstand stress. Classical methods to analyze fracture […]

Mechanical reliability of fused deposition modeled polymers and composites Özgür Keleş* and Eric H. Anderson* * Biomedical, Chemical and Materials Engineering Department, San Jose State University San Jose, CA, 95192, USA; [email protected] Fused deposition modeling (FDM) is the most widely- used additive manufacturing technique for the production of cost-effective polymers and composites. FDM offers design […]

I will talk about our work on the “Mechanical behavior of 3D printed continuous glass-fiber-reinforced nylon” in the symposium Metal and Polymer Matrix Composites IV.  Two of my MS and another undergraduate student have been working on this project. Abstract Title: Mechanical behavior of 3D printed continuous glass-fiber-reinforced nylonAuthors: Ozgur Keles, Stephanie Luke, David Soares, Afrah […]

I will be presenting at the 2018 TechConnect World Innovation Conference. Title:  Mechanical reliability of fused deposition modeled polymers and compositesAuthors: O. Keles, E.H. Anderson Day: Wednesday, May 16Time: 11:10 AM Venue: Anaheim Convention Center, Anaheim, California, U.S.A. This title may be found in the general online program, or you may find it in the […]

Mechanical reliability of short carbon fiber reinforced ABS produced via vibration assisted fused deposition modelingÖzgür Keleş, Eric H. Anderson, and Jimmy HuynhBiomedical, Chemical and Materials Engineering Department, San Jose State University, San Jose, California, USARapid Prototyping JournalStructured Abstract:Purpose — Mechanical reliability (variations in mechanical properties) of fused deposition modeled (FDMed) short-fiber-reinforced composites are unknown, which […]

I will also present a poster about our recent research on mechanical reliability of additively manufactured composites. For more information please click. Image showing our hierarchical simulation approach to reveal the origins of the mechanical reliability in additively manufactured lattice structures. Posted 8th November 2017 by Ozgur Keles

Eric Anderson will be presenting his work at Materials Science & Technology 2017, Monday Oct. 9, 10:20 am, room 304.  Additive Manufacturing of Composites and Complex Materials II Effect of Porosity on Stochastic Fracture of Additive Manufactured Polymer Matrix Composites Eric Anderson, Ozgur Keles Consumer level Fused deposition modeling (FDM )systems have been used for production of open-source free […]

During my Introduction to Materials class, MatE 25 S17, I asked students to develop a website showing their top 10 materials and pictures in which they identified different materials.  Here are some examples (pictures are taken from the students’ websites): http://ericsmaterials.blogspot.com https://kaseyleong97.wixsite.com/mysite https://kaseyleong97.wixsite.com/mysite http://ces-materials.blogspot.com http://rohitbhogal.blogspot.com/2017/04/top-10-favorite-materials.html http://sydneygraulmaterials.blogspot.com http://alexandergooyandeh.blogspot.com https://nikooyang.wixsite.com/mysite/single-post/2017/04/24/3-Photos-and-Their-Materials https://wanishanme.wixsite.com/introtomaterials/single-post http://thedancingengineer.blogspot.com Posted 19th June 2017 by […]

Wareable.com interviewed the SJSU VR lab last week. Robert Bruce is the head of the VR lab and he started the lab. I discussed our work on VR and materials engineering.  I believe VR will provide most of the learning environments in the future.  We are currently working on a virtual materials engineering lab to provide […]

Navathej Gobia, Darshan Vijayakumar a, Ozgur Keles a and Folarin Erogbogbo a* http://pubs.acs.org/doi/full/10.1021/acsomega.6b00517 ABSTRACT: Incorporation of nanoparticles into polymer resins has recently attracted a significant amount of attention from researchers for the nanoparticles ability to alter the properties of the resin. While graphene-based structures possess a 2D honeycomb arrangement of carbon atoms that make them […]

Prof. Ruiping Liu joined our group as a research scientist. She will be doing first principle investigations of bonding between graphene quantum dots and functional groups. Her expertise is density functional theory (DFT).   Posted 23rd March 2017 by Ozgur Keles

Posted 2nd March 2017 by Ozgur Keles

 David discussing additive manufacturing and design with the San Jose High School students.  Posted 24th February 2017 by Ozgur Keles

SJSU Students win SPACE RACE challenge SJSU alumni Russell Kirkman and graduate student Yosune Casana have been named challenge winners in the SPACE RACE startup competition. The SPACE RACE contest is organized by the Center for Advancing Innovation (CAI) in partnership with the National Aeronautics and Space Administration (NASA) and with support from the Medical […]

Can Students Flourish in Engineering Classrooms? Posted 6th February 2017 by Ozgur Keles

Here is a collection of videos that are related to materials science and engineering. I show one or two videos during the class.Suggested videos for students interested in Materials Science and EngineeringDr. Ozgur Keles, San Jose State University Chapter 1, Interesting materials, what is materials science and engineering Smart materials (1 of 5): Gecko Adhesive […]

My graduate student Alex Cress will be presenting his research on stochastic fracture of fused deposition modeled (3D printed) ABS in Materials Science & Technology 2016, Salt Lake City, UT. Here are the details of the conference: Effect of Build Parameters on the Variation in Mechanical Properties of Fused Deposition Modeled ABS: Alex Cress1; Ozgur […]

We investigated the effects of build orientation on the mechanical reliability of 3D printed ABS using a Stratasys uPrint SE. Thanks to my undergraduate researcher Caleb W. Blevins (second author), we were able to generate 262 specimens and test their mechanical behavior. The most important finding is that the reliability of FDM produced ABS can […]

We investigated the effect of porosity and crack size distributions on the fracture behavior of porous glass through a combined finite element and fracture mechanics method. Simulations showed that the effect of crack size distributions on the change in fracture strength with porosity decreases as the pore size to crack size ratio increases. For a […]

I joined the San Jose State University in August and recently got the Kordestani Endowed Chair position for my research projects. I would like to thank the professors: Guna Selvaduray, Melaine McNeil, Folarin Erogbogbo, Richard Chung, Essam Marouf, and our dean Andrew Hsu for their support. The Kordestani Endowed Chair position provides research funds, which […]

The details about the research projects can be found in the links, new projects will be uploaded soon. 1. Reliability of 3D-printed polymer components, click for the details. 2. Electric field effect on stress evolution in piezoelectric materials, click for the details. Posted 25th August 2015 by Ozgur Keles

I have been investigating the effects of porosity on the fracture behavior of brittle materials. In this recent work, we produced pharmaceutical compacts and tested their mechanical behavior through diametral compression tests.  I am glad that the two names in this paper–Nicholas P. Barcenas and Daniel H. Sprys–were my undergraduate researchers without whom the paper […]

Title: Mechanical reliability of fused deposition modeled materials Date: Monday, July 30Time: 2:00pmLocation: NASA Ames N229/R215 Abstract: Additive manufacturing (AM) is increasingly used for space, defense, transportation, and consumer product applications. Among various AM techniques, fused deposition modeling (FDM) is most common one that can produce polymer, composite, metal, and ceramic materials. However, FDMed materials contain […]

We have finished the “Design for Innovation” class at the Illinois Institute of Technology (IIT). My learners–I prefer learners instead of students–have done tremendous work on projects, such as sustainable chair, trebuchet, and biomimetic robot. The details about the class can be found in the MMAE 232 website. Here are some of the pictures from the […]