Ranajay Ghosh

University of Central Florida

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Aloke Kumar

Indian Institute of Science Bangalore

147

Thomas Thundat

University at Buffalo, State University of New York

138

ZÇ

Zeynep Çelik‐Butler

The University of Texas at Arlington

133

Ion Bita

Google (United States)

133

Donald P. Butler

The University of Texas at Arlington

133

Larry R. Barnett

National Taiwan University

133

Craig Snoeyink

University at Buffalo, State University of New York

133

Murat Okandan

Sandia National Laboratories

133

Jit Muthuswamy

Arizona State University

133

Markus J. Buehler

Massachusetts Institute of Technology

133

Cooperative Institutions

University of Central Florida

Northeastern University

Universidad del Noreste

Harbin Institute of Technology

Massachusetts Institute of Technology

Chinese Academy of Sciences

Florida College

University of California, Davis

University of Alberta

Qatar University

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Material-geometry interplay in damping of biomimetic scale beams

Applied Physics Letters (2023)

Hossein Ebrahimi Milos Krsmanovic Hessein Ali Ranajay Ghosh

Biomimetic scale-covered substrates are architected meta-structures exhibiting fascinating emergent nonlinearities via the geometry of collective scales contacts. Despite much progress in understanding their elastic nonlinearity, their dissipative behavior arising from scales sliding is relatively uninvestigated in the dynamic regime. Recently discovered is the phenomena of viscous emergence, where dry Coulomb friction between scales can lead to apparent viscous damping behavior of the overall multi-material substrate. In contrast to this structural dissipation, material dissipation common in many polymers has never been considered, especially synergistically with geometrical factors. This aspect is addressed here, where material viscoelasticity is introduced via a simple Kelvin–Voigt model for brevity and clarity. The results contrast the two damping sources in these architectured systems: material viscoelasticity and geometrical frictional scales contact. It is discovered that although topically similar in effective damping, viscoelastic damping follows a different damping envelope than dry friction, including starkly different effects on damping symmetry and specific damping capacity.

Thermoelastic damping

Damping capacity

Viscous damping

Macroscopic scale

10.1063/5.0150081

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Citations (3)

Macroscale Platforms Capable of Biological Studies and Manipulations at Nanoscale to Bio-inspired and Bacterial Nanorobotics

Springer eBooks (2012)

Gabriela Juárez-Martı́nez Alessandro Chiolerio Paolo Allia Martino Poggio Christian L. Degen

Nanorobotics

10.1007/978-90-481-9751-4_100369

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Metropolis Monte Carlo Method

Springer eBooks (2012)

Gabriela Juárez-Martı́nez Alessandro Chiolerio Paolo Allia Martino Poggio Christian L. Degen

10.1007/978-90-481-9751-4_100410

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Citations (2)

MEMS Adaptive Optics

Springer eBooks (2012)

Gabriela Juárez-Martı́nez Alessandro Chiolerio Paolo Allia Martino Poggio Christian L. Degen

10.1007/978-90-481-9751-4_298

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Citations (0)

Monolithic Integration of Carbon Nanotubes

Springer eBooks (2012)

Gabriela Juárez-Martı́nez Alessandro Chiolerio Paolo Allia Martino Poggio Christian L. Degen

10.1007/978-90-481-9751-4_100463

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Energy harvesting using snap-through deformation in lattice structures

Applied Physics Letters (2018)

Soheil Safari Loaliyan Hassan Bahaloo Ranajay Ghosh Hamid Nayeb‐Hashemi Ashkan Vaziri

We demonstrated the feasibility of harvesting mechanical energy through the proper design and installation of a lattice structure which undergoes snap-through deformation under applied mechanical loading. First, the theoretical formulations for both symmetric and asymmetric modes of the snap-through deformation in a 2D lattice structure were derived. Then, experiments were conducted on the prototype to measure the energy harvesting ability at different frequencies and to investigate the capability of charging a capacitor connected to the lattice prototype. Finally, the effects of the defect in the lattice on energy harvesting were discussed. Our results showed that the average generated voltage across a 25 kΩ resistor increased by increasing the frequency of loading. However, energy stored in a capacitor was independent of loading frequency. For a defective structure with a fixed vertex, the generated voltage is lower yet increasing with the frequency of loading. The designed structure is robust and provides sustainable energy output under cyclic loading even with the presence of defects and imperfections.

Lattice (music)

Mechanical energy

10.1063/1.5044399

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Citations (3)

Color and Morphology Camouflaging using Biomimetic Scales

Advanced Intelligent Systems (2019)

Soroush Kamrava Milad Tatari Xinyu Feng Ranajay Ghosh Ashkan Vaziri

Due to obvious evolutionary advantages to both predator and prey, a rich gamut of camouflaging strategies exists in nature. Engineered camouflaging generally involves adapting bioinspired strategies to produce superior concealment and disguise in synthetic systems. Of special interest is dynamic, active camouflaging, which can rapidly conceal structures depending upon the background landscape. Herein, exciting advances are made by mimicking Cephalopod strategies. An alternative geometrically structured biomimetic scale‐based strategy, which is purely mechanical and simple but at the same time rapid, tailorable and tunable, and inherently multifunctional, is presented. Surfaces covered by biomimetic scales that are themselves covered by lenticular images are investigated. A concurrent programming strategy to tune surface morphology and color by controlling the angle of individual scales is introduced. As an example, a pneumatic design to control individual‐scale orientations using airflow, which enables both morphology and color camouflaging in less than a second, is demonstrated.

Biomimetics

Morphology

Gamut

10.1002/aisy.201900021

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Citations (4)

Micro-patterning

Springer eBooks (2012)

Gabriela Juárez-Martı́nez Alessandro Chiolerio Paolo Allia Martino Poggio Christian L. Degen

10.1007/978-90-481-9751-4_100437

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Citations (0)