elastodynamics
Requisites on material viscoelasticity for exceptional points in passive dynamical systems
Dear Colleagues,
I invite you to read our recent publication in the Journal of Physics: Materials: https://iopscience.iop.org/article/10.1088/2515-7639/ace381
Journal Club for July 2023: A Space-Time Odyssey - Taming Exceptional Points in Elastodynamics for Sensitivity and Emissivity Enhancement and Asymmetric Wave Steering
By: Ramathasan Thevamaran (Theva)
Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
Research Lab: https://thevamaran.engr.wisc.edu
Identifying elastic wave polarization and bandgaps in periodic solid media
Dear iMechanica community,
I would like to share with you the publication of our paper Identifying elastic wave polarization and bandgaps in periodic solid media, in the International Journal of Mechanical Sciences.
Title: Identifying elastic wave polarization and bandgaps in periodic solid media
Authors: Maria Carrillo-Munoz and Bhisham Sharma
Emergence of Exceptional Points in Periodic Metastructures with Hidden PT-symmetric Defects
Dear Colleagues, Our recent publication on the Journal of Applied Mechanics:
Universal route for the emergence of exceptional points in PT-symmetric metamaterials with unfolding spectral symmetries
We introduce a class of parity-time symmetric elastodynamic metamaterials (Ed-MetaMater) whose Hermitian counterpart exhibits unfolding (fractal) spectral symmetries. Our study reveals a scale-free formation of exceptional points in those Ed-MetaMaters whose density is dictated by the fractal dimension of their Hermitian spectra.
MS/PhD positions U of Tennessee elastodynamic metamaterials & RTE (computational)
I have a few positions (funded by NSF, AFRL, and/or ARO) for MS or PhD (preferred) students at the University of Tennessee Space Institute (UTSI) and University of Tennessee Knoxville (UTK) in the following two topics:
1. Elastodynamic metamaterials: Characterization of dispersive constitutive equations and simulation of the material with overall properties in the time domain (TD), analysis of the effect of disorder and material nonlinearities (e.g. fracture) in their performance, etc.
Environmentally induced exceptional points in elastodynamics
We study the nature of an environment-induced exceptional point in a non-Hermitian pair of coupled mechanical oscillators. The mechanical oscillators are a pair of pillars carved out of a single isotropic elastodynamic medium made of aluminum and consist of carefully controlled differential losses. The interoscillator coupling originates exclusively from background modes associated with the “environment,” that portion of the structure which, if perfectly rigid, would support the oscillators without coupling.
