Elastic metamaterials for guided waves: from fundamentals to applications

Smart Materials and Structures, Journal Year: 2023, Volume and Issue: 32(12), P. 123001 - 123001

Published: Oct. 16, 2023

Abstract Guided waves, elastic waves propagating through bounded structures, play a pivotal role in various applications, including ultrasonic non-destructive testing and structural health monitoring. Recently, metamaterials artificially engineered to exhibit physical properties not typically seen nature have emerged as ground-breaking approach, heralding new era guided wave-based technologies. These offer innovative solutions overcome the inherent constraints of traditional technology. This paper comprehensively reviews from their fundamental principles diverse focusing on transformative impact wave manipulation.

Language: Английский

---

Hybrid Metasurfaces for Perfect Transmission and Customized Manipulation of Sound Across Water–Air Interface

Advanced Science, Journal Year: 2023, Volume and Issue: 10(19)

Published: April 20, 2023

Abstract Extreme impedance mismatch causes sound insulation at water–air interfaces, limiting numerous cross‐media applications such as ocean‐air wireless acoustic communication. Although quarter‐wave transformers can improve transmission, they are not readily available for acoustics and restricted by the fixed phase shift full transmission. Here, this limitation is broken through impedance‐matched hybrid metasurfaces assisted topology optimization. Sound transmission enhancement modulation across interface achieved independently. Compared to bare interface, it experimentally observed that average transmitted amplitude an metasurface peak frequency enhanced ≈25.9 dB, close limit of perfect 30 dB. And nearly 42 dB measured with axial focusing function. Various customized vortex beams realized promote in The physical mechanisms broadband wide‐angle incidences revealed. proposed concept has potential efficient free communication dissimilar media.

Language: Английский

---

Metasurface-guided flexural waves and their manipulations

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 257, P. 108538 - 108538

Published: June 15, 2023

Language: Английский

---

Arbitrary wavefront modulation utilizing an aperiodic elastic metasurface

International Journal of Mechanical Sciences, Journal Year: 2023, Volume and Issue: 255, P. 108460 - 108460

Published: May 11, 2023

Language: Английский

---

Systematic topology optimization of elastic metamaterials for broadband bandgaps and customized mechanical properties

Mechanical Systems and Signal Processing, Journal Year: 2024, Volume and Issue: 211, P. 111260 - 111260

Published: Feb. 17, 2024

Language: Английский

---

Polarization-independent full mode-converting elastic metasurfaces

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 266, P. 108975 - 108975

Published: Jan. 2, 2024

Language: Английский

---

Enhanced Broadband Manipulation of Acoustic Vortex Beams Using 3‐bit Coding Metasurfaces through Topological Optimization

Small, Journal Year: 2024, Volume and Issue: 20(19)

Published: Jan. 17, 2024

Abstract The acoustic coding metasurfaces (ACMs) have the ability to manipulate complex behavior by reconstructing sequence. In particular, design of broadband enhances versatility ACMs. ACMs offer significant advantages over traditional metasurfaces, including a limited number units and flexible wave control performance. unit quantity is determined 2 n , with 1‐bit utilizing units, 2‐bit using 4 3‐bit employing 8 units. Utilizing multiple bits allows for precise phase sound waves enables realization more intricate functions. To address requirements multi‐bit applications, this paper presents development novel reflected (BACMs) eight These are systematically designed bottom‐up topology optimization method. A constant difference 45° can be achieved across all within broad frequency range. Additionally, spiral distribution differences construction an vortex metasurface. Moreover, combining convolution method, strategies outlined constructing vortex‐focusing beam manipulation metasurfaces. possess potential in fields particle suspension communication.

Language: Английский

---

Towards design of a gradient locally resonant acoustic metasurface for negative reflection

Journal of the Mechanics and Physics of Solids, Journal Year: 2024, Volume and Issue: 187, P. 105632 - 105632

Published: March 27, 2024

Gradient acoustic metasurfaces are a class of subwavelength metamaterials that provide unprecedented opportunities to control the direction reflected and refracted waves, including negative angles in accordance with diffraction theory generalized law reflection. This opens new possibilities designing for many practical applications wave engineering. In this work, locally resonant considered as building units metasurface, which owe their favorable properties local resonances at microstructural level. Non-trivial reflection realized by introducing suitable phase modulations along path. The required shift is achieved through variation geometrical material parameters metamaterial unit cells. ultrasound waves demonstrated numerically means finite-element analysis fluid-metasurface-solid structure. results study insights detailed guidelines controllable

Language: Английский

---

Anisotropic Morphing in Bistable Kirigami through Symmetry Breaking and Geometric Frustration

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(23)

Published: Feb. 28, 2024

Abstract Shape morphing in bistable kirigami enables remarkable functionalities appealing to a diverse range of applications across the spectrum length scale. At core their shape shifting lies architecture repeating unit, where highly deformable slits and quasi‐rigid rotating units often exhibit multiple symmetries that confer isotropic deployment obeying uniform scaling transformation. In this work, symmetry breaking is investigated access geometric frustration anisotropic morphing, enabling arbitrarily scaled planar spatial domains. With an analysis on properties complemented by systematic investigation integrating semi‐analytical derivations, numerical simulations, experiments elastic sheets, work unveils fundamental relations between slit symmetry, frustration, deployment. Furthermore, asymmetric are leveraged flat‐to‐3D demonstrations showcase pivotal role shear deformation achieving target shapes functions so far unattainable with uniformly stretchable kirigami. The insights provided unveil controlling soft metamaterials, enriching achievable for spanning deployable space structures, wearable technologies, machines.

Language: Английский

---

Advances in suppression of structural vibration and sound radiation by flexural wave manipulation

Thin-Walled Structures, Journal Year: 2024, Volume and Issue: 200, P. 111936 - 111936

Published: April 25, 2024

Language: Английский

---