March Chapter Meeting
Additive Manufacturing and Mechanical Reliability
Speaker: Dr. Ozgur Keles
San Jose State University
Wednesday, the 14th of March we will be meeting at Michael’s at Shoreline 2960 Shoreline Blvd., Mountain View
5:30 pm Social/Networking…6:15 pm Dinner…7:30 pm Speaker
Buffet Dinner Cost: ASM Members $30……Students $10……Guests $35…..Talk only - Free
Reservations: Contact Al Kwong at (408) 248-1916 or firstname.lastname@example.org or Jack Jew at email@example.com
Fused deposition modeling (FDM) is the most common additive manufacturing technique for the production of cost effective polymers and composites. In fact, half million FDM systems were sold between 2013 and 2015. FDM is used in industries, such as biomedical, aerospace, automotive, defense, agriculture, and consumer product. In addition, the number of open-source free designs, which can be downloaded and 3D printed, are increasing exponentially. However, the FDMed materials contain inherent pores between the deposited beads and inside the beads. In addition, pores can be intentionally included in an FDMed design to add functionality, such as heat or mass transport. These pores reduce mechanical properties and introduce variations in mechanical properties, i.e., lower mechanical reliability. We recently reported that the mechanical reliability of FDMed polymers can be as low as technical ceramics . High reliability is a must for FDMed materials to compete and/or replace conventional mass production. In this talk, I will discuss the origins of the mechanical reliability in FDMed polymers and composites. Biomimetic meso-structure and vibration-assisted FDM approaches will be described to improve reliability in FDMed materials. Our recent work showed that intentional vibrations  or biomimetically engineered deposition path can be used to double Weibull modulus–a key parameter in Weibull statistics describing the scatter in fracture strength.
Dr. Ozgur Keles
College of Engineering, San Jose State University
Ozgur Keles is an Assistant Professor of Biomedical, Chemical, and Materials Engineering at San Jose State University. Dr. Keles received his Ph.D. in Materials Engineering from Purdue University in 2013. Following, he joined Illinois Institute of Technology as a research associate and lecturer, where he investigated the reliability of porous glasses and porous pharmaceutical compacts. His work on the deviations from Weibull statistics in porous ceramics was highlighted at the Gordon Research Conferences and awarded by the American Ceramic Society. He is also a photographer and digital artist who uses aesthetically appealing images and computational visualizations to improve student engagement, to aid student learning, and to foster creativity in engineering students. His work at the intersection of engineering, education, and arts was also highlighted in the The Member Journal of TMS. His current research interests are stochastic fracture of additively manufactured materials and ceramics, mechanical behavior of graphene quantum dot reinforced hierarchical composites, processing of graphene quantum dot infused zirconia-based composites, and virtual reality applications in engineering education.
CondAlign AS is a technology development company located in Oslo, Norway. CondAlign develops a unique technology where electric fields are applied to polymer matrices to manipulate and align dispersed particles. The particles align due to dielectrophoresis and induced dipole-dipole interactions, allowing a wide range of particles and matrices to be used.
After alignment, the viscous polymer-particle structures are fixated by curing the matrix.
Applications for the technology include electrically and thermally conductive films, where the particle alignment permits a dramatic reduction of particle content, improved performance or added functionality. Without alignment, these materials are typically particle rich systems with concentrations above the percolation threshold. Other notable applications are microfiltration membranes as well as
gas-separation membranes. The process is demonstrated and ready for scale up. The first commercial product will be biomedical electrodes, with expected market entry in 2018. For thermal applications, we have demonstrated over 100% improved thermal conductivity, compared with non-aligned samples. For more information, please visit www.condalign.com
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