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MSE Colloquium: Mohammad Elahinia, On the Development of High Quality NiTi Shape Memory and Pseudoelastic Parts by Additive Manufacturing

Associate Professor of Mechanical Engineering and Director of Dynamic and Smart Systems Lab, University of Toledo, Toledo, OH

All dates for this event occur in the past.

264 MacQuigg Labs
105 W. Woodruff Ave
Columbus, OH 43210
United States

Abstract

Nickel-Titanium (NiTi) shape memory alloys (SMAs) with near-equiatomic exhibit both a thermal shape memory (pseudoplasticity) and a mechanical memory (pseudoelasticity). Both effects are based on a reversible martensitic phase transformation. The type of the effect primarily depends on the transformation temperatures, which can be adjusted through variation in the Ni-Ti ratio. Currently, NiTi is the most commonly used SMA due to its outstanding functional characteristics and high working capacity, which far exceeds other SMAs. Additive manufacturing provides an attractive processing method for NiTi shape memory and pseudoelastic parts. In this research, we show how the additive manufacturing process affects structural and functional properties of additively manufactured NiTi and how the process parameter set-up can be optimized to produce high quality NiTi parts and components. Comparisons of shape recovery due to shape memory and due to pseudoelasticity in additively manufactured and in commercial NiTi exhibit promising potential for this innovative processing method.

Bio

Mohammad Elahinia is currently an Associate Professor of Mechanical, Industrial and Manufacturing Engineering (MIME). He serves as Director of the Dynamic and Smart Systems Laboratory at UT. Dr. Elahinia’s research interests are in developing dynamic models and designing control systems for smart and active materials. His current research is focused on biomedical application of shape memory alloys. He is the PI from UT for a Third Frontier Project “Nitinol Commercialization Accelerator.” This accelerator is a $10 million investment by the State of Ohio, the Cleveland Clinic, NASA Glenn Research Center, Norman Noble Inc., the University of Toledo, and Case Western Reserve University. At UT he has served as investigator on 26 funded projects with a total budget of more than $6 million. These projects are funded by NSF, EPA, US Army, US DOT, Ohio Department of Development, Ohio Board of Regents, and the UT. Dr. Elahinia is the recipient of several awards, including the 2010 ASME Adaptive Structures and Material Systems Gary Anderson Early Achievement Award, 2010 University of Toledo College of Engineering Faculty Excellence Award, Outstanding Young Faculty Research Award from University of Toledo in 2006 and Torgersen Graduate Research Excellence Award from Virginia Tech in 2004. 
 
Dr. Elahinia is an Associate Editor for Journal of Intelligent Material Systems and Structures and Journal of Shock and Vibration. He also serves as the chair of the American Society of Mechanical Engineers Adaptive Structures and Material Systems Branch.