Ankur Dwivedi | SMSS Laboratory | IIT Kanpur

Recent Publications (Apr-2022)

Sat, 30 Apr 2022 00:00:00 +0530

Journal Articles

V. Gupta, B. Bhattacharya, S. Adhikari (2022). Energy Absorption of Hourglass Shaped Lattice Metastructures. Experimental Mechanics.

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Ankur Dwivedi, Arnab Banerjee, Sondipon Adhikari, Bishakh Bhattacharya (2022). Bandgap merging with double-negative metabeam. Mechanics Research Communications.

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Rupal Srivastava, Bishakh Bhattacharya (2022). De-coupling the Eigenmodes of SMA-reinforced Bimorph Composites using Multi-objective Optimization. Journal of Vibration Engineering & Technologies.

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Conference Papers

Vivek Gupta, Rajendra Kumar Munian, Bishakh Bhattacharya (2022). Dispersion analysis of periodic hourglass-shaped metamaterials for wave propagation. Active and Passive Smart Structures and Integrated Systems XVI.

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Kumar Gourav, Amanpreet Singh, Bishakh Bhattacharya (2022). A study on bandgap attenuation in metamaterials by varying the shape of cross-section. Active and Passive Smart Structures and Integrated Systems XVI.

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Amanpreet Singh, Bishakh Bhattacharya, Arnab Banerjee (2022). Vibration attenuation in graded meta-sandwich beam. Active and Passive Smart Structures and Integrated Systems XVI.

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Amanpreet Singh, Tanmoy Mukhopadhyay, Sondipon Adhikari, Bishakh Bhattacharya (2022). Voltage modulation of elastic properties of asymmetric hybrid lattice structure. Active and Passive Smart Structures and Integrated Systems XVI.

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, Vivek Gupta, Sondipon Adhikari, Bishakh Bhattacharya (2022). Interface modes in topologically protected edge states using hourglass based metastructures. Active and Passive Smart Structures and Integrated Systems XVI.

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Workshop on Metamaterial and Metasandwich for Energy Harvesting and Vibration Control

Thu, 18 Mar 2021 00:00:00 +0530

Workshop Details

Date: 26-27 March, 2021
Time: 9:00 AM to 6:00 PM IST
Mode: Online via Zoom

Workshop Schedule

Workshop Speakers

- Prof. Sondipon Adhikari (Swansea University, UK)

Lecture 1: Introduction to metamaterials and structural mechanics of cellular metamaterials
Lecture 2: Inhomogeneous cellular metamaterials
Lecture 3: Dynamic homogenisation of metamaterials

- Prof. Tanmoy Mukhopadhyay (IIT Kanpur, India)

Title : Programmable mechanical property modulation in origami metamaterials

Abstract - This lecture will introduce the concept of origami-based mechanical metamaterials for programmable stiffness and shape modulation. We would uncover an unusual behaviour of metamaterials, which would allow the capability of achieving programmable near-zero stiffness, moderate stiffness and substantially high stiffness in a single configuration. Along with stiffness modulation, we would show how it is possible to develop metamaterials with deformation dependent spatially varying mixed-mode Poisson’s ratios, despite having a uniform initial structural configuration. The spatial profile of such metamaterials can be modulated as a function of the applied far-field global force, and the configuration and assembly of the origami bases. This creates a new possibility of developing a distant actuation feature in the metamaterial enabling us to achieve controlled local actuation. The fundamental programmable features of the origami metamaterials unraveled in this lecture can find a wide range of applications in soft robotics, aerospace, biomedical devices and various other advanced physical systems.

- Prof. Arnab Banerjee (IIT Delhi, India)

Title : Wave propagation in metamaterials

Abstract - Wave propagation through the periodic medium attracts the attention of the researcher due to its versatile applications in waveguiding, passive vibration isolation, etc. Different types of beam cross-section, alteration of geometry in a periodic manner gives birth to the attenuation bandgaps. The constitutive transfer and dynamic stiffness matrix of the unit cell govern the wave propagation. First, we will focus on the development of a dynamic stiffness matrix or spectral element matrix from the governing constitutive equation of motion. Interconversion between the spectral element and transfer matrix will be discussed. Some illustrative wave propagation problem will be discussed in more details for beams having not regular cross-section f llowed by the future application of it.

- Prof. Bishakh Bhattacharya (IIT Kanpur, India)

Title : Smart material inspired metamaterials
- Lecture 1: Fundamentals of piezoelectric actuation
- Lecture 2: Application of smart material for meta sandwich and metamaterial
- Lecture 3: Metamaterial for energy harvesting

For Registration:

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For any query, please contact

Amanpreet Singh (amangill@iitk.ac.in)
Ankur Dwivedi (ankurdwi@iitk.ac.in )
Vivek Gupta (vivekgup@iitk.ac.in)

Image References

Recent Publication (Feb-2021)

Tue, 16 Feb 2021 00:00:00 +0530

Ankur Dwivedi, Arnab Banerjee, Sondipon Adhikari, Bishakh Bhattacharya (2021). Optimal electromechanical bandgaps in piezo-embedded mechanical metamaterials. International Journal of Mechanics and Materials in Design.

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Ankur Dwivedi, Arnab Banerjee, Bishakh Bhattacharya (2021). Dynamics of Piezo-Embedded Negative Stiffness Mechanical Metamaterials: A Study on Electromechanical Bandgaps. Volume 1: Acoustics, Vibration, and Phononics.

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Metastructures & Metamaterials

Thu, 24 Dec 2020 20:18:05 +0530

Project Status: Ongoing

1. Dual Functional Metamaterials and Metastructures for Energy Harvesting and Vibration Control

The dynamics of periodic materials and structures have a profound historic background starting from Newton’s first effort to find sound propagation in the air to Rayleigh’s exploration of continuous periodic structures. This field of interest has received another surge from the early 21st century. Elastic mechanical metamaterials are the exemplars of periodic structures that exhibit interesting frequency-dependent properties like negative Young’s modulus and negative mass in a specific frequency band due to additional feature of local resonance. It implies, the spatial periodicity of mechanical unit cells in engineered metamaterials exhibits properties beyond one can expect from conventional naturally occurring materials. Locally resonant units in the designed metamaterial facilitate bandgap formation virtually at any frequency for wavelengths much higher than the lattice length of a unit cell. Whereas at higher frequencies for wavelengths equal to the lattice size of the medium, the Bragg scattering phenomenon occurs, which also helps in the bandgap formation. Read more…

2. Exploring the dynamics of hourglass shaped lattice metastructures

Continuous demand for the improvement of mechanical performance of engineering structures pushes the need for metastructures to fulfil multiple functions. Extensive work on lattice-based metastructure has shown their ability to manipulate wave propagation and producing bandgaps at specific frequency ranges. Enhanced customizability makes them ideal candidates for multifunctional applications. This paper explores a wide range of nonlinear mechanical behavior that can be generated out of the same lattice material by changing the building block into dome shaped structures which improves the functionality of material significantly. Read more…

3. Metamaterial inspired tensairity beam for frequency band attenuation

Tensairity refers to a class of lightweight structure which has a wide range of interesting applications such as temporary bridges, inflatable kites, of unmanned aerial vehicle wings and mainsail in sailing boats. A Tensairity structure has three main components, namely tension element, compression element and air beam. The primary purpose of the air beam is to stabilise the compression element under loading. The combination of these elements results in a structure which has lightweight compared to conventional structures for the same strength and vice versa. In this study, we explore a new concept of meta tensairity beam. Read more…

4. Voltage modulated elastic moduli in lattice metamaterials

Two-dimensional lattices are ideal candidate for developing artificially engineered materials and structures across different length-scales, leading to unprecedented multi-functional mechanical properties which can not be achieved in naturally occurring materials and systems. Characterization of effective elastic properties of these lattices is essential for their adoption as structural elements of various devices and systems. All the parameters that control the effective elastic properties are passive in nature. After manufacturing the lattice structure with a certain set of geometric or material-based parameters, there is no room to modulate the properties further. In this article, we propose a hybrid lattice micro-structure by integrating piezo-electric materials with the members of the lattice for active voltage-dependent modulation of elastic properties. A bottom-up multi-physics based analytical framework leading to closed-form formulae is derived for hexagonal lattices to demonstrate the concept of active lattices. Read more…