AEM Seminar: Resonant Ultrasound Spectroscopy for Characterization of Advanced Solids
Hanus Seiner, the Institute of Thermomechanics, Czech Academy of Sciences
2:30 PM on 2017-12-08
Resonant Ultrasound Spectroscopy for Characterization of Advanced Solids
Abstract:
Resonant Ultrasound Spectroscopy (RUS) is a well established experimental method for determination of elastic moduli and internal friction parameters of anisotropic solids. In the past two decades, non-contact modifications of this method have been developed, utilizing focused laser beams both for generation and for detection of ultrasonic vibrations. In the non-contact arrangement, the RUS method is capable of determination of up to all 21 independent elastic constants of a generally anisotropic material. In addition, the RUS measurements of evolutions of these constants with temperature, time, or external magnetic field enable a surprisingly deep insight into internal micro-mechanics and physics of the examined materials, and contribute significantly to the understanding of mechanisms of phase transitions taking place in these materials.
The talk will summarize the historical development of RUS, its main principles and limitations, with the focus on the non-contact RUS apparatus developed and operated at the Czech Academy of Sciences in Prague. The versatility and reliability of the RUS measurements will be illustrated on several examples of up-to- date problems from materials science, including shape memory alloys, thin nano-structured semi-conducting films, graphene-based composites, and acoustic meta-materials.
Bio:
Hanuš Seiner is an associate professor at the Institute of Thermomechanics, Czech Academy of Sciences, Prague, Czech Republic. He is the deputy-head of the Department of Ultrasonic Methods of this institute. His research interests cover ultrasonic characterization of solids, phase transitions, and mechanics of microstructures in advanced materials.
Prof. Seiner gained his Ph.D. in applied physics at the Czech Technical University in Prague, and afterwards received a post-doctoral grant from the Czech Science Foundation for research at the Czech Academy of Sciences. He takes part in several international projects and collaborations, and has spent short-time research stays in Tallinn (Estonia), Oxford (UK), Dresden (Germany), Aachen (Germany) and Haifa (Israel). In 2017 he was awarded Otto Wichterle Premium, which is the major Czech encouragement award for outstanding young scientists. Currently he is staying for 10 months at AEM University of Minnesota as a Fulbright Fellowship Visiting Scholar.