46 citations · 91 across the 16 of their papers we have counts for
16 papers
Scaling limits of Smoluchowski particles
Julian Amorim, Arturo Arellano, Milton Jara
We prove a law of large numbers and a functional central limit theorem for the empirical density of a Marcus-Lushnikov model. The limiting density turns out to be the solution of a…
Momentum-Transfer Framework Unifies High-Velocity Impact and Failure Across Materials, Geometries, and Scales
Yasara Dharmadasa, Nicholas Jaegersberg, Ara Kim +2
Materials that dissipate energy efficiently under high-speed impacts, from micrometeoroid strikes on spacecraft to ballistic penetration in protective systems, are essential for ma…
Enduring mechanical memory from the constitutive response of elastically recoverable nanostructured materials
Abhishek Gupta, Bhanugoban Maheswaran, Nicholas Jaegersberg +2
Mechanical memory and computing are gaining significant traction as means to augment traditional electronics for robust and energy efficient performance in extreme environments. Ho…
Implicit Geometric Descriptor-Enabled ANN Framework for a Unified Structure-Property Relationship in Architected Nanofibrous Materials
Bhanugoban Maheswaran, Komal Chawla, Abhishek Gupta +1
Hierarchically architected nanofibrous materials, such as the vertically aligned carbon nanotube (VACNT) foams, draw their exceptional mechanical properties from the interplay of n…
Embracing Nonlinearity and Geometry: A dimensional analysis guided design of shock absorbing materials
Abhishek Gupta, Komal Chawla, Ramathasan Thevamaran
Protective applications require energy-absorbing materials that are soft and compressible enough to absorb kinetic energy from impacts, yet stiff enough to bear crushing loads. Ach…
Damping Reveals Hidden Dimensions in Elastic Metastructures Through Induced Transparency
Yanghao Fang, William Tuxbury, Abhishek Gupta +2
Damping typically results in attenuation of vibrations and elastic wave propagation in mechanical systems. Contrary to this conventional understanding, we demonstrate experimentall…
Dynamic Hardness Evolution in Metals from Impact Induced Gradient Dislocation Density
Jizhe Cai, Claire Griesbach, Savannah G. Ahnen +1
A clear understanding of the dynamic behavior of metals is critical for developing superior structural materials as well as for improving material processing techniques such as col…
Requisites on viscoelasticity for exceptional points in passive elastodynamic metamaterials
Abhishek Gupta, Ramathasan Thevamaran
The recent progress of non-Hermitian physics and the notion of exceptional point (EP) degeneracies in elastodynamics has led to the development of novel metamaterials for the contr…
Superior mechanical properties by exploiting size-effects and multiscale interactions in hierarchically architected foams
Komal Chawla, Abhishek Gupta, Abhijeet S. Bhardwaj +1
Protective applications in extreme environments demand thermally stable materials with superior modulus, strength, and specific energy absorption (SEA) at lightweight. However, the…
Emergence of Exceptional Points in Periodic Metastructures with Hidden PT-symmetric Defects
Yanghao Fang, Tsampikos Kottos, Ramathasan Thevamaran
We study the elastodynamics of a periodic metastructure incorporating a defect pair that enforces a parity-time (PT) symmetry due to a judiciously engineered imaginary impedance el…
Enhanced Signal-to-Noise Performance of EP-based Electromechanical Accelerometers
Rodion Kononchuk, Jizhe Cai, Fred Ellis +2
Exceptional points (EP) are non-Hermitian spectral degeneracies where both eigenvalues and their corresponding eigenvectors coalesce. Recently, EPs have attracted a lot of attentio…
Reconfigurable Enhancement of Actuation Forces by Engineered Losses in non-Hermitian Metamaterials
Abhishek Gupta, Arkady Kurnosov, Tsampikos Kottos +1
While boosting signals with amplification mechanisms is a well established approach, attenuation mechanisms are typically considered an anathema because they degrade the efficiency…
Origins of size effects in initially dislocation-free single-crystal metallic micro- and nanocubes
Claire Griesbach, Seog-Jin Jeon, David Funes Rojas +6
We report phenomenal yield strengths, up to one fourth of the theoretical strength of silver, recorded in microcompression testing of initially dislocation free silver micro and na…
Universal Route for the Emergence of Exceptional Points in PT-Symmetric Metamaterials with Unfolding Spectral Symmetries
Yanghao Fang, Tsampikos Kottos, Ramathasan Thevamaran
We introduce a class of Parity-Time symmetric elastodynamic metamaterials (Ed-MetaMater) whose Hermitian counterpart exhibits a frequency spectrum with unfolding (fractal) symmetri…
Environmentally-induced exceptional points in elastodynamics
V. Dominguez-Rocha, Ramathasan Thevamaran, F. M. Ellis +1
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 o…
Asymmetric Acoustic Energy Transport in Non-Hermitian Metamaterials
Ramathasan Thevamaran, Richard Massey Branscomb, Eleana Makri +4
The ability to control and direct acoustic energy is essential for many engineering applications such as vibration and noise control, invisibility cloaking, acoustic sensing, energ…