Anastasiia O. Krushynska

ENTEG University of Groningen · Faculty of Science and Engineering

Elastic metamaterials are known for unusual dynamics of elastic waves that is impossible for common engineered composites. This is due to their carefully engineered architecture, generating frequency bandgaps with inhibited wave propagation. However, elastic wave propagation is also influenced by the mechanical properties of constituent materials,...

Additive manufacturing opens promising perspectives for realizing acoustic metamaterials to control sound in multiple application scenarios. Especially attractive are hybrid flexible-rigid 3D-printed metastructures as they combine the advantages of rigid designs (e.g., load-bearing performance) and an increased number of structural degrees of freed...

Recently emerged aperiodic textured metamaterials have opened up routes to multi-functional and programmable functionalities. Such possibilities have, however, been explored mainly in quasi-static regimes. Here, we show that the tuning-by-pruning strategy enables realizing multi-frequency steering in random elastic networks thus showing a way to th...

The band-gap frequencies of elastic metamaterials are ideally determined by a metamaterial architecture; yet, in practical situations, are often dependent on the material damping in their constituent(s). The analysis of viscoelastic metamaterials requires however substantial computational resources and, except for oversimplified cases, is solely do...

This broad review summarizes recent advances and “hot” research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on results presented by the authors at the EUROMECH 610 Colloquium held on April 25–27, 2022 in Benicássim, Spain. The key goal of the colloquium was to highlight important developments in these areas, pa...

The frequency of a wave is a crucial parameter to understanding its propagation to a structured medium. While metamaterials can be designed to focus or steer deformations or waves toward a specific location, wave steering toward multiple targeted locations at different frequencies remains challenging. Here we show that pruning of random elastic net...

Underwater Sensing Seals can detect prey up to 180 m away using their flow‐sensing whiskers, which feature undulating morphologies that reduce vortex‐induced vibrations. In article number 2207274, Ajay Giri Prakash Kottapalli, Xingwen Zheng, and co‐workers investigate harbor and grey seal whiskers' interactions with the flow and find that neighbori...

Many marine animals perform fascinating survival hydrodynamics and perceive their surroundings through optimally evolved sensory systems. For instance, phocid seal whiskers have undulations that allow them to resist noisy self‐induced vortex‐induced vibrations (VIV) while locking their vibration frequencies to wakes generated by swimming fishes. In...

Shape morphing is one of the most attractive functionalities of materials desired in many applications, including robotic grippers, medical stents, wearable electronics, etc.. Shape morphing can be implemented by using mechanical meta-materials combining building blocks with properly designed mechanical or material properties. The design approaches...

Artificial wings composed of rigid and flexible materials enable flapping flight accompanied by sound. Understanding the acoustics of natural insect wings allowed to explain basic mechanisms of sound generation by artificial wings. This work proposes the use of metamaterial surface patterns to control the acoustic and aerodynamic characteristics of...

Three-dimensional (3D) bioprinting technology has put forward a great deal of interest in the current time by facilitating easy adaptability in many industries and research sectors such as biomedical, manufacturing, education, and engineering. Specifically, 3D- bioprinting has provided significant advances in the medical industry, since such a tech...

Insect wings are formed by intricate combinations of flexible membranes and rigid veins; such a structure enables excellent flight performance, adaptability to aerodynamic forces, and different biological functions. A comprehensive understanding of the interplay between wing patterning and flight dynamics has however not been achieved yet due to th...

The demands on adaptive optics are increasing to achieve high performance and meet the requirements for accuracy and reliability with these systems. At present, common technologies for actuator arrays are highly developed and designed in complex arrangements leading to bulky devices. In this work, we propose a novel approach for designing modular a...

This paper aims to optimize vibro-acoustic response of (non-) auxetic sandwich panels by use of topology optimization method. First, structural noise and vibration responses of the auxetic panel with the re-entrant hexagonal honeycomb core are studied. It is proved that the interactions between the structural vibrations and induced noise are more c...

Insect wings are an outstanding example of how a proper interplay of rigid and flexible materials enables an intricate flapping flight accompanied by sound. The understanding of the aerodynamics and acoustics of insect wings have enabled the development of man-made flying robotic vehicles and explained basic mechanisms of sound generation by natura...

The present invention relates to a three-dimensional metamaterial capable of attenuating elastic waves and mechanical vibrations in broad low-frequency ranges. The three-dimensional metamaterial comprises multiple unit cells that form a three-dimensional lattice. The invention further relates to a unit cell of a three-dimensional metamaterial capab...

In this work, we demonstrate in a proof of concept experiment the efficient noise absorption of a 3-D printed panel designed with appropriately arranged space-coiled labyrinthine acoustic elementary cells. The labyrinthine units are numerically simulated to determine their dispersion characteristics and then experimentally tested in a Kundt Tube to...

The high heterogeneity of the microstructure makes cellular metamaterial have a high degree of programmability. In this paper, the contour shapes of soft cylindrical honeycomb structures under tensile deformation are programmatically designed a comprehensive method based on theoretical derivation, numerical optimization and experiment verification....

Waveguiding is highly desirable for multiple applications but is challenging to achieve in wide continuous frequency ranges. In this work, we developed a three-dimensional phononic crystal with broadband waveguiding functionality. Waveguiding is achieved by combining two types of unit cells with different wave scattering features to create an arbit...

Insects flapping flight has been inspiring generations of scientists to understand its peculiarities and, since recently, to develop maneuverable flying micro vehicles. Full-field modelling and detailed experiments have unveiled key mechanisms of the flight dynamics, flow and noise generation around wings and enabled practical realizations of artif...

Phononic materials are artificial composites with unprecedented abilities to control acoustic waves in solids. Their performance is mainly governed by their architecture, determining frequency ranges in which wave propagation is inhibited. However, the dynamics of phononic materials also depends on the mechanical and material properties of their co...

Phononic materials are artificial composites with unprecedented abilities to control acoustic waves in solids. Their performance is mainly governed by their architecture, determining frequency ranges in which wave propagation is inhibited. However, the dynamics of phononic materials also depends on the mechanical and material properties of their co...

This talk is devoted to the 10-th anniversary of the untimely tragic death of Prof. Viatcheslav V. Meleshko who was the scientific advisor of my M.Sc. and Ph.D. theses in 2004-2008. The first part of the talk is devoted to the overview of Prof. V.V. Meleshko's works on the dynamics of stress waves in solids-the topic central to his Doctorate degree...

Broadband manipulation of low-frequency elastic waves is challenging, though highly desirable for many applications. Here, we propose lattice-type phononic materials with a waveguiding functionality at broad frequencies. The working principle relies on combining two types of phononic unit cells with limited and extremely broadband attenuation prope...

This research develops lightweight stepped cantilever beams using two auxetic hexagonal and anti-tetrachiral designs to reduce sound radiation from vibrating modes of attached structures. A finite element analysis (FEA) is employed to investigate the equivalent radiated power level (ERPL) of the proposed beams subjected to different excitations. A...

We focus on the design and testing of acoustic, phononic, and mechanical metamaterials to unveil and promote their applications in various fields. Our materials reveal unprecedented shape-morphing, tunable and programmable properties, enable vibration & noise control and isolation, and contribute to a circular economy approach by enabling smart ene...

The focus of this paper is on elastic metamaterials characterised by the presence of wide sub-wavelength band gap. In most cases, such mechanical property is strictly connected to the periodic repetition of the unit cell. Nonetheless, the strict periodicity requirement could represent a drawback. In this paper, we present a design strategy for aper...

We investigate the propagation of elastic waves in magnetoactive periodic laminates under a magnetic field. Magnetoactive elastomers (MAEs) are composed of magnetizable particles dispersed in a polymer matrix. MAEs have the ability to change their size and properties in response to a remote magnetic field excitation. Here, we consider MAE laminates...

We investigate the behavior of soft magnetoactive periodic laminates under remotely applied magnetic field. We derive explicit formulae for the induced deformation due to magnetic excitation of the laminates with hyperelastic magnetoactive phases. Next, we obtain the closed-form formulas for the velocities of long transverse waves. We show the depe...

Tensegrity is a structural principle in biomechanics and architecture enabling to design rigid and mechanically stable structures by combining prestressed cables and isolated beams in compression. The present work reports a new class of tunable tensegrity-type meta-materials capable of manipulating the propagation of elastic waves by varying the le...

This work is aimed at theoretically and numerically investigating the presence of frequency band gaps in the wave dynamics of 1D tensegrity-based composite metamaterials, and to exploit the possibility of their tuning for the design and test of novel waveguides, soundproof layers and vibration protection devices. Building on established results for...

We investigate the acoustic band structure of tensegrity mass-spring chains as a function of the applied, local and global states of prestress. We first study the bandgap response of linear monoatomic chains, which show lumped masses connected to tensegrity prisms acting as mechanical springs. Next, we present a numerical study on the nonlinear wav...

Acoustic metamaterials have opened promising opportunities for manipulation of low-frequency sound and development of compact structures with a broadband acoustic performance for noise mitigation applications, room, and architectural acoustics. So far, several mechanisms have been studied to achieve broadband sound absorption at subwavelength frequ...

Acoustic filters and metamaterials have become essential components for elastic wave control in applications ranging from ultrasonics to noise abatement. Other devices have been designed in this field, emulating their electromagnetic counterparts. One such case is an acoustic diode or rectifier, which enables one-way wave transmission by breaking t...

Acoustic metamaterials offer fascinating opportunities for manipulating sound and the development of compact devices with broadband performance. The ability of resonant-based metamaterials to induce slow sound has recently been exploited to design thin sound absorbers at deep subwavelength frequencies. In this work, we show that the combination of...

We propose a class of 3D metamaterials with inclined lattice units interlayered by solid or phononic plate elements. These configurations are characterized by simultaneously high stiffness to weight ratios and enhanced energy absorption and demonstrate a potential for vibration control and broadband wave manipulation.

This paper proposes a strategy to broaden complete bandgap attenuating flexural and longitudinal modes, and to shift them to lower frequencies by spatially folding designs. Numerical simulations show that the V-folded acoustic black hole beam exhibits an ultra-wide complete bandgap below 1 kHz due to longitudinal-flexural waveform transformation ,...

We propose a design strategy for hybrid metamaterials with alternating phononic plates and pentamode units that produce complete bandgaps for elastic waves. The wave control relies on the simultaneous activation of two scattering mechanisms in the constituent elements. The approach is illustrated by numerical results for a configuration comprising...

We present the realization of an acoustic diode or rectifier, exploiting symmetry-breaking nonlinear effects like harmonic generation and wave mixing and the filtering capabilities of metamaterials. The essential difference and advantage compared with previous acoustic diode realizations is that the present is simultaneously a time invariant, frequ...

After their introduction in the field of electromagnetics at the beginning of the century, the principles of metamaterials have been applied for manipulation of elastic and acoustic waves [1,2]. In recent years, they have been the focus of research in an increasingly large community. Many fascinating effects such as cloaking, negative refraction, f...

To achieve wave control at broad-band ultra-low frequencies, we design "accordion-like" meta-structures by periodically alternating tensegrity prisms with solid disks. The structures are characterized by extremely wide band gaps, which can be tuned by varying the level of prestress in the constituent elements. They provide valid alternatives to oth...

Perfect absorption and total reflection are fascinating phenomena with multiple applications. We demonstrate that the mechanism of slow sound propagation in combination with space-coiling of a wave path can be efficiently used to induce/achieve these phenomena in narrow channels at low frequencies. The reported concept opens novel possibilities for...

Perfect absorption and total reflection are fascinating phenomena with multiple applications. We demonstrate that the mechanism of slow sound propagation in combination with space-coiling of a wave path can be efficiently used to induce/achieve these phenomena in narrow channels at low frequencies. The reported concept opens novel possibilities for...

Hierarchical structures with constituents over multiple length scales are found in various natural materials like bones, shells, spider silk and others, all of which display enhanced quasistatic mechanical properties, such as high specific strength, stiffness, and toughness. At the same time, the role of hierarchy on the dynamic behavior of metamat...

This work studies the acoustic band structure of tensegrity mass-spring chains, and the possibility to tune the dispersion relation of such systems by suitably varying local and global prestress variables. Building on established results of the Bloch-Floquet theory, the paper first investigates the linearized response of chains composed of tensegri...

Composite materials with engineered band gaps are promising solutions for wave control and vibration mitigation at various frequency scales. Despite recent advances in the design of phononic crystals and acoustic metamaterials, the generation of wide low-frequency band gaps in practically feasible configurations remains a challenge. Here, we presen...

Perfect absorption and total reflection are fascinating phenomena with multiple applications. We demonstrate that the mechanism of slow sound propagation in combination with space-coiling of a wave path can be efficiently used to induce/achieve these phenomena in narrow channels at low frequencies. The reported concept opens novel possibilities for...

Popular version of paper 1aNS3, “Fractal and bio-inspired labyrinthine acoustic metamaterials”

This work studies the acoustic band structure of tensegrity metamaterials, and the possibility to tune the dispersion relation of such systems by playing with local and global prestress variables. Building on established results of the Bloch-Floquet theory, the paper first investigates the linearized response of chains composed of tensegrity units...

Control of low-frequency sound is a challenge, despite numerous advances in the field. Recently emerged acoustic metamaterials have already proven their efficiency for the development of innovative systems for sound control and demonstration of such fascinating phenomena as super-resolution imaging, transformation acoustics, acoustic cloaking, etc....

We numerically analyze the performance of labyrinthine acoustic metamaterials with internal channels folded along a Wunderlich space-filling curve to control low-frequency sound in air. In contrast to previous studies, we perform direct modeling of wave propagation through folded channels, not introducing effective theory assumptions. As a result,...

Attenuating low-frequency sound remains a challenge, despite many advances in this field. Recently-developed acoustic metamaterials are characterized by unusual wave manipulation abilities that make them ideal candidates for efficient subwavelength sound control. In particular, labyrinthine acoustic metamaterials exhibit extremely high wave reflect...

Acoustic metamaterials are known as a promising class of materials interacting with acoustic and/or elastic waves. Band gap formation is one of the most spectacular phenomena that they exhibit. Different ways to broaden the attenuated frequency ranges are still being actively explored. It turns out that material damping through intrinsic viscoelast...

The field of acoustic metamaterials has attracted much attention in recent years due to the possibilities they provide for wave manipulation and for the generation of exotic properties such as negative refraction, super-resolution imaging or cloaking. In particular, recently introduced labyrinthine metamaterials can generate extremely high effectiv...

The appearance of nonlinear effects in elastic wave propagation is one of the most reliable and sensitive indicators of the onset of material damage. However, these effects are usually very small and can be detected only using cumbersome digital signal processing techniques. Here, we propose and experimentally validate an alternative approach, usin...