333 citations · 1.2k across the 13 of their papers we have counts for
14 papers
Hyperuniformity as a unifying organizational principle across diatom architectures
Eric Ballestero, Chiara Gazzola, Raj Kumar Pal +2
Diatom frustules have long fascinated scientists for the extraordinary beauty, diversity, and functionality of their intricate silica architectures. Yet, the spatial organization o…
Bound modes in the continuum based phononic waveguides
Adib Rahman, Raj Kumar Pal
We analytically predict and numerically demonstrate the existence of a family of bound modes in the continuum (BICs) in bi-layered spring mass chains. A coupled array of such chain…
Spectral flow of a localized mode in elastic media
Marco Miniaci, Florian Allein, Raj Kumar Pal
The introduction of structural defects in otherwise periodic media is well known to grant exceptional space control and localization of waves in various physical fields, including…
Topological bands and localized vibration modes in quasiperiodic beams
Raj Kumar Pal, Matheus I. N. Rosa, Massimo Ruzzene
We investigate a family of quasiperiodic continuous elastic beams, the topological properties of their vibrational spectra, and their relation to the existence of localized modes.…
Edge states and topological pumping in elastic lattices with periodically modulated coupling
Matheus I. N. Rosa, Raj Kumar Pal, José R. F. Arruda +1
We investigate the dispersion topology of elastic lattices characterized by spatial stiffness modulation. The modulation is defined by the sampling of a two-dimensional surface, wh…
Valley based splitting of topologically protected helical waves in elastic plates
Marco Miniaci, Raj Kumar Pal, Raffaele Manna +1
Topological protection offers unprecedented opportunities for wave manipulation and energy transport in various fields of physics, including elasticity, acoustics, quantum mechanic…
Tunable wave propagation by varying prestrain in tensegrity-based periodic media
Raj Kumar Pal, Massimo Ruzzene, Julian J. Rimoli
This paper investigates the dynamic properties of one, two and three-dimensional tensegrity-based periodic structures introduced in Rimoli and Pal, Comp. B, 2017, which are here te…
A study of deformation localization in nonlinear elastic lattices
Raj Kumar Pal, Federico Bonetto, Luca Dieci +1
The paper investigates localized deformation patterns resulting from the onset of instabilities in lattice structures. The study is motivated by previous observations on discrete h…
Observation of topological valley modes in an elastic hexagonal lattice
Javier Vila, Raj K. Pal, Massimo Ruzzene
We report on the experimental observation of topologically protected edge waves in a two-dimensional elastic hexagonal lattice. The lattice is designed to feature K point Dirac con…
Amplitude-dependent topological edge states in nonlinear phononic lattices
Raj Kumar Pal, Javier Vila, Michael Leamy +1
This work investigates the effect of nonlinearities on topologically protected edge states in one and two-dimensional phononic lattices. We first show that localized modes arise at…
Non-Schmid Effects In Perfect Single Crystal Metals At Zero Temperature
Hossein Salahshoor, Raj Kumar Pal, Julian J. Rimoli
A long standing postulate in crystal plasticity of metals is that yielding commences once the resolved shear stress on a slip plane reaches a critical value. This assumption, known…
A Bloch-based procedure for dispersion analysis of lattices with periodic time-varying properties
Javier Vila, Raj Kumar Pal, Massimo Ruzzene +1
We present a procedure for the systematic estimation of the dispersion properties of linear discrete systems with periodic time-varying coefficients. The approach relies on the ana…
Edge waves in plates with resonators: An elastic analogue of the quantum valley Hall effect
Raj Kumar Pal, Massimo Ruzzene
We investigate elastic periodic structures characterized by topologically nontrivial bandgaps supporting backscattering suppressed edge waves. These edge waves are topologically pr…
Helical edge states and topological phase transitions in phononic systems using bi-layered lattices
Raj Kumar Pal, Marshall Schaeffer, Massimo Ruzzene
We propose a framework to realize helical edge states in phononic systems using two identical lattices with interlayer couplings between them. A methodology is presented to systema…