Woodruff School of Mechanical Engineering

Faculty Candidate Seminar


Tunable wave propagation in meta-materials and structures


Dr. Raj Kumar Pal


Georgia Institute of Technology


Thursday, November 30, 2017 at 11:00:00 AM


MRDC Building, Room 3515


Dr. Karim Sabra


Metamaterials and metastructures are artificially engineered structures designed to exhibit properties not found in conventional materials. By careful design, one can obtain unprecedented control over various physical properties. Examples in mechanics includes structures having unique wave steering properties, lightweight and multifunctional capabilities with potential applications in diverse areas like impact protection, reconfigurable structures, noninvasive surgery and energy harvesting. In this talk, I will illustrate my work on meta-materials and structures whose behavior can be tuned by external control. I will show how fundamental principles of mechanics can be used to design tunable or switchable lattices supporting topologically protected edge modes. These modes allow for one-way wave propagation along the boundary, immune to the presence of defects in the body. Originally discovered in quantum systems, they also arise in other areas of physics. Here, I will outline a general procedure that I recently developed for designing elastic lattices supporting one-way propagation in continuous elastic media and discuss its implementation on a Kagome lattice. Finally, I will present my future research vision on how the interplay between large deformation, wave propagation and topology can be exploited to address challenges arising in diverse areas ranging from communications to soft robotics to energy and security.


Raj Kumar Pal holds a PhD in Theoretical and Applied Mechanics from the University of Illinois at Urbana Champaign. He earned his Bachelors and Masters Degrees, both in mechanical engineering, from the National Institute of Technology, Trichy and the Indian Institute of Science, Bangalore, India, respectively. He is currently a postdoctoral fellow at the School of Aerospace Engineering at the Georgia Institute of Technology. His research interests include wave propagation, developing metamaterials, constitutive modeling and finite element methods.


Refreshments will be served.