Letter
Physics, Multidisciplinary
Yangyang Chu, Tong Sun, Zhaohong Wang, Zhifeng Zhang, Ming Chen
Summary: This paper proposes an acoustic bandgap manipulation method for pentamode metamaterials, which enables the creation of a composite pentamode metamaterial with a low-frequency broadband. The mechanism and the relationship between the bandgap and structural parameters are analyzed, and the effects of these parameters on the first bandgap are calculated. The simulation results confirm the theoretical predictions, showing that a low-frequency ultra-wideband structure can be achieved within a specific frequency range without changing the structural parameters.
Article
Physics, Applied
Guangxin Liao, Congcong Luan, Zhenwei Wang, Jiapeng Liu, Xinhua Yao, Jianzhong Fu
Summary: Acoustic metamaterials have the ability to effectively control wave propagation through special structures, with high transmission efficiency and full range phase shift variations. The designed acoustic metamaterials can manipulate transmission angle according to the generalized Snell's law, and are capable of selective permeability for acoustic filtering. The devices exhibit great potential for applications in various fields.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Mechanical
Feng Zhu, Yilin Qu, Ernian Pan
Summary: This paper investigates the acoustic attenuation induced by electrodes in high-frequency piezoelectric acoustic devices, proposing a new interdisciplinary model which reveals two wave motion features that significantly affect GHz acoustic attenuations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Xudong Fan, Yifan Zhu, Zihao Su, Ning Li, Xiaolong Huang, Yang Kang, Can Li, Chunsheng Weng, Hui Zhang, Bin Liang, Badreddine Assouar
Summary: A novel reconfigurable acoustic metascreen is proposed for broadband manipulations of transmitted acoustic waves. The metascreen consists of uniquely designed unit cells that can modulate the transmitted phase shift within the full 2pi range and have excellent impedance matching with the background medium. By arranging the reconfigurable elements, different phenomena and functionalities, such as acoustic focusing and acoustic bending, can be easily realized. Numerical and experimental results demonstrate the ultra-broadband and reconfigurable features of the metascreen, covering a frequency range from 3 to 17 kHz, which is the majority spectrum of human hearing. The proposed metascreen opens a promising and pragmatic route for the design of compact broadband acoustic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Mechanical
Mounir Tafkirte, Adil Hamine, Hicham Mesbah, Idris Aboudaoud, Dominique Decultot
Summary: This study presents a theoretical procedure for modeling the backscatter of ultrasonic signals in a multilayer structure (MS) immersed in water under normal incidence. The transfer matrix method (TMM) is used to analytically analyze the propagation of longitudinal ultrasonic waves in the MS, considering each layer as a quadrupole formalism combining stresses and velocities. The TMM enables the determination of the reflection coefficient for the multilayer structure. Experimental data validation and characterization of non-dispersive longitudinal waves are conducted using time-frequency methods. The TMM method is utilized to investigate MS dispersion under various conditions, such as different layer thicknesses, non-uniform layer distributions, and frequency ranges.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Physics, Applied
Dong-Yu Han, Yao-Yin Peng, Guang-Sheng Liu, Xin-Ye Zou, Jian-Chun Cheng
Summary: This study introduces a novel square piezoelectric side-branch pipe-type structure that can tune the performance of acoustic metamaterials without structural modification or complex active control circuits. By adjusting the capacitances connected to the piezoelectric composite sheets, phase control of transmitted waves and switching between different functions can be achieved.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Juan Mo, Zongren Peng, Xu Wang
Summary: This paper presents theoretical and numerical studies on the vibrating mechanisms of acoustic micromembranes (A mu Ms) and demonstrates their unique behavior in terms of sound insulation. The results provide a theoretical foundation for designing large-scale, high-insulation assemblies of A mu Ms.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Madhukant Sharma, Udit Satija
Summary: In this paper, a multi-variate extension of the generalized dispersive mode decomposition (GDMD) is proposed to accurately estimate cross-group delays and extract overlapped dispersive modes. A joint dispersion optimization solution for multi-channel dispersive signals is also proposed to extract all high-quality overlapped dispersive modes with minimal cross-dispersion effects. Simulation results on synthetic and real-life signals demonstrate the superiority of the proposed multi-variate GDMD (MGDMD) over existing techniques.
Article
Acoustics
Jie Zhang, Dan Yao, Wang Peng, Ruiqian Wang, Jiang Li, Shaoyun Guo
Summary: This paper studies the design and application of lightweight acoustic metamaterials for low-frequency noise and vibration control in high-speed trains. Through experiments and modeling, the effectiveness of the acoustic metamaterials in reducing noise and vibration is demonstrated.
Article
Physics, Applied
Hao-Wen Dong, Sheng-Dong Zhao, Mourad Oudich, Chen Shen, Chuanzeng Zhang, Li Cheng, Yue-Sheng Wang, Daining Fang
Summary: Unlike electromagnetic and acoustic waves, elastic waves have different wave modes which increase the complexity of the problem but provide more possibilities for wave manipulation. Elastic bulk wave conversion in metamaterials has shown great promise in medical ultrasound and nondestructive testing. Reflective multiple mode-conversion mechanism and metasurface design methodology open up potential for a class of elastic-wave-based devices with promising applications in underwater environments.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Mechanical
Ke Wang, Yi Chen, Muamer Kadic, Changguo Wang, Martin Wegener
Summary: In our previous work, we have demonstrated the presence of roton-like dispersion relations in acoustic metamaterials with nonlocal interactions, similar to superfluid Helium-4. However, this effect was observed only for specific sound propagation directions. In this study, we designed a three-dimensional cubic-symmetry airborne acoustic metamaterial that exhibits roton-like behavior along all three orthogonal directions, albeit with significant anisotropy. Our numerical calculations, in good agreement with a simplified analytical model, indicate that experimental validation is possible but challenging due to the complex and dense three-dimensional network of acoustic channels required.
ACTA MECHANICA SINICA
(2023)
Article
Multidisciplinary Sciences
Chengxin Cai, Xue Wang, Qifu Wang, Mingxing Li, Guangchen He, Zhaohong Wang, Yao Qin
Summary: This paper proposes two multilayer composite cylindrical three-dimensional pentamode metamaterials with low frequency and broad band gaps for underwater low frequency acoustic wave control. The new materials achieve significant improvements compared to traditional double-cone pentamode metamaterials.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Jendrik Voss, Gianluca Rizzi, Patrizio Neff, Angela Madeo
Summary: We propose an inertia-augmented relaxed micromorphic model that improves upon the previous version by introducing a term Curl P & BULL; in the kinetic energy density. The enriched model enables a better overall fitting of dispersion curves and allows for the description of modes with negative group velocity, leading to negative refraction effects. It also provides more flexibility in determining the cut-off values. However, for very small wavelengths close to the size of the unit cell, achieving perfect quantitative agreement is still necessary.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Acoustics
Aurora Magnani, Cristina Marescotti, Francesco Pompoli
Summary: This work proposes an improved design procedure for sound absorption metamaterials using acoustic coiled-up quarter-wave resonators to broaden the range of possible applications, even in low-frequency regime. Various models were used to understand sound propagation in different types of tubes and to accurately model visco-thermal loss within the structures. An analytical model was developed to define different loss contributions and a geometric parameterization procedure was conducted to maximize acoustic absorption at specific target frequencies.
Article
Materials Science, Multidisciplinary
Jiaying Wang, Florian Allein, Cecile Floer, Nicholas Boechler, James Friend, Oscar Vazquez-Mena
Summary: This study presents a novel technology to fabricate acoustic metamaterials in water using microstructured silicon chips, enabling their operation in the MHz range for applications in biomedical ultrasound. The metamaterials are formed by assembling silicon chip unit cells that incorporate silicon nitride membranes and Helmholtz resonators. Finite-element method simulations and experimental measurements confirm the negative-index behavior of the material in the 0.25-0.35 MHz range. This work opens up new possibilities for achieving relevant frequencies for biomedical ultrasound applications using silicon technology microfabrication.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)
