Bilayer Topo

News

New PhD openings  

October 2025: Our non-pneumatic tire based on topologically polarized lattices was granted a US patent. Congratulations to co-inventor and former lab member Will Zunker! 

August 2025: Our latest work on topological mechanics has been published in the Proceedings of the National Academy of Sciences LINK

July 2025: Honored to be elected Fellow of the American Society of Mechanical Engineers (ASME) 

July 2025: Check out our latest work on drop motion controls with vibrations, published in the Physical Review Research LINK

July 2025: Just delivered a keynote lecture in a vibrant Mini-Symposium on Elastic Metamaterials and Topological Aspects of Waves at ESMC 2025 in Lyon, France 

June 2025: Just delivered a plenary lecture at Phononics 2025 in Seoul, South Korea 

May 2025: Congratulations to group member and PhD candidate Pegah Azizi, recipient of the prestigious Doctoral Dissertation Fellowship

May 2025: Congratulations to group alumnus Mohammad Charara, recipient of the prestigious university-wide Best PhD Dissertation Award for the category Physical Sciences & Engineering category at the University of Minnesota

February 2025: Our latest work, demonstrating programmability of liquid drop motion using metamaterials, has been published in the Proceedings of the Royal Society A LINK

November 2024: Our work with Princeton collaborators, mixing origami and topological mechanics, has been published in the Proceedings of the National Academy of Sciences LINK

September 2024: Congratulations to group alumnus Mohammad Charara, recipient of an Engineering Excellence postdoc fellowship at MIT 

August 2024: Our paper Nonlocal twist sequences in floppy kagome chains has been accepted for publication in Physical Review Applied

August 2024: Our paper Omnidirectional domain wall modes protected by fragile topological states has been accepted for publication as a Letter in Physical Review B

July 2024: Our paper Edge-selective reconfiguration in polarized lattices with magnet-enabled bistability has been accepted for publication in Extreme Mechanics Letters

July 2024: We have been awarded a grant from the National Science Foundation titled Collaborative Research: Topology of shapes, topology of waves and their interplay in metamaterials optimization. Our collaborator is Shelly Zhang (UIUC) 

October 2023: Just finished hosting the SES 2023 Annual technical Meeting. Thank you to all who have contributed to make it a huge success! 

September 2023: Congratulations to group alumnus Weijian Jiao, new faculty member at Tongji University 

September 2023: Excited to begin my sabbatical year as William R. Kenan Visiting Professor for Distinguished Teaching at Princeton University

September 2023: Welcome to Sergio V.B. Santos, new PhD student in the group

July 2023: Honored to receive the James L. Record Professorship, in the footsteps of many UMN CEGE greats.

March 2023: Our paper Dynamics of self-dual kagome metamaterials and the emergence of fragile topology has been accepted for publication in Physical Review Letters

December 2022: We have been awarded a grant from the National Science Foundation titled Metamaterial architectures for programmable droplet motion. Our collaborator is Sungyon Lee (U of Minnesota) 

October 2022: Congratulations to group member Caleb Widstrand, recipient of CEGE Cale Anger Best MS Thesis award

October 2022: Our paper Omnimodal topological polarization of bilayer networks: Analysis in the Maxwell limit and experiments on a 3D-printed prototype has been published in the Proceedings of the National Academy of Sciences. LINK

May 2022: Our paper Bandgap tuning in kerfed metastrips under extreme deformation has been published in Extreme Mechanics Letters. LINK

December 2021: Our paper Topological Flexural Modes in Polarized Bilayer Lattices has been published in Physical Review Applied. LINK

July 2021: Our paper Wavenumber-space band clipping in nonlinear periodic structures has been published in the Proceedings of the Royal Society A. LINK

June 2021: Our paper Tunable band gaps and symmetry breaking in magnetomechanical metastructures inspired by multilayer 2D materials has been published as a Letter in Physical Review B. LINK

June 2021: Our paper Soft topological lattice wheels has been published in Extreme Mechanics Letters. LINK

March 2021: Congratulations to group alumnus R. Ganesh, new faculty member at IIT Bombay 

December 2020: We have been awarded a grant from the National Science Foundation titled Collaborative Research: Cellular Metamaterials That Localize Stress. Towards A Topological Protection against Fracture. Our collaborators are Joe Labuz (U of Minnesota) and Xiaoming Mao (U of Michigan)

Overview

Welcome to the webpage of my research group at the University of Minnesota. Our research interests revolve around the modeling, simulation and testing of complex dynamic phenomena in unconventional structures and materials, with emphasis on architected solids, phononic crystals and elastic metamaterials. In our work, we strive to blend theoretical, computational and experimental work to develop ideas holistically from initial theoretical considerations to proof of concept. Some of our most recent efforts have been directed towards the investigation of nonlinear waves in periodic media, topological mechanical and dynamical phenomena, and soft mechanical metamaterials. In parallel, we are also interested in techniques for material diagnostics and structural health monitoring based on the structural mechanics adaptation of selected ideas originated in the fields of machine learning and computer vision.

Contact Information

  • Email: sgonella(at)umn.edu
  • CEGE webpage: https://cse.umn.edu/cege
  • Office: CivE Building, Room 154
  • Phone: (612) 625-0866