Article
Multidisciplinary Sciences
Mohammad Charara, James McInerney, Kai Sun, Xiaoming Mao, Stefano Gonella
Summary: Periodic networks known as Maxwell lattices exhibit zero-frequency modes localized to their boundaries. A class of mechanical bilayers has been introduced as a model system for designing omnimodal polarization, coupling in-plane dilational and shearing modes to out-of-plane flexural modes. Mirror-symmetric bilayers with in-plane modal localization and topological polarization have been identified, leading to the emergence of omnimodal polarization where in-plane and out-of-plane edge modes localize on the same edge. Experimental confirmation was done on a mirror-symmetric, topologically polarized kagome bilayer fabricated via additive manufacturing.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Yaoran Liu, Zilong Wu, Pavana Siddhartha Kollipara, Richard Montellano, Kumar Sharma, Yuebing Zheng
Summary: The study demonstrated label-free detection of chiral molecules with microbubble-induced rapid accumulation on plasmonic chiral sensors, achieving ultra-high sensitivity and low sample consumption. This method has potential for clinical applications in detecting abnormal chirality in biofluids related to diabetes.
Article
Physics, Applied
Chengming Xuan, Weikai Xu, Zhe Yang, Wuchao Qi, Wei Wang
Summary: This paper proposes a one-dimensional phononic crystal-type metastructure, which can achieve a full range of phase shifts and broadband frequency tuning by adjusting the distance between mass oscillators and increasing or decreasing the number of oscillators, realizing phenomena such as abnormal refraction, beam focusing, and self-acceleration based on the generalized Snell's law.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Instruments & Instrumentation
Cheng Zhang, Qingsheng Yang, Ran Tao
Summary: This paper presents a design method for adjustable coefficient of thermal expansion metamaterials based on the Miura-ori structure. By using materials with diverse CTEs as components, it achieves precise control of thermal deformation structures in severe environments. The metamaterials can optimize service reliability by adjusting the material distribution and folding angles.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Mechanics
X. -L. Gao
Summary: This study analytically determines the critical velocities of a two-layer composite tube under a uniform internal pressure moving at a constant velocity. The Love-Kirchhoff thin shell theory is used with the consideration of rotary inertia and material anisotropy. Closed-form expressions are derived for the general case, including the effects of material anisotropy, rotary inertia, and radial stress. Special cases without the rotary inertia effect and/or the radial stress effect, as well as with various types of material symmetry for each layer, are also obtained. The importance of this research is discussed and demonstrated through the analysis of a specific example.
Article
Optics
A. N. Darinskii
Summary: This paper demonstrates the equivalence between the group velocity and the energy velocity of electromagnetic Bloch waves in nonabsorbing periodic superlattices with generic crystallographic symmetry.
Article
Engineering, Mechanical
Liyun Cao, Zhichun Yang, Yanlong Xu, Zhaolin Chen, Yifan Zhu, Shi-Wang Fan, Krupali Donda, Brice Vincent, Badreddine Assouar
Summary: A new conceptual design of pillared elastic metasurface is proposed in this study to manipulate flexural waves in plates by considering constructive interference, overcoming the need for heavy grooving or drilling on plate structures. The coupling and phase shift mechanisms of transmitted waves across sub-units are analyzed to establish an analytical model for accurately predicting wave behavior. The design demonstrates deflecting and focusing functionalities, offering a new approach for broad applications of constructive interference in elastic metamaterials.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Multidisciplinary Sciences
Lucy Liu, Gary P. T. Choi, L. Mahadevan
Summary: The research links kirigami patterns with the symmetry of periodic plane tilings, demonstrating a systematic approach to constructing, cutting, and adjusting kirigami patterns to achieve size and symmetry changes.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Engineering, Mechanical
Yongdu Ruan, Xu Liang
Summary: The paper proposes a surface impedance matched method for designing reflective elastic metasurfaces and demonstrates their effective control over reflected waves. The results show that the designed metasurface can accurately redirect reflected waves and efficiently suppress scattering waves, potentially enabling functionalities of flexural wave manipulation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Yan-Bin Wang, Hai-Tao Liu, Tie-Jun Li
Summary: This paper proposes novel beam-like mechanical metamaterials (BLMMs) with different flexural rigidities in two directions. The BLMMs are composed of rigid parts and flexible parts, showing different flexural rigidities in the rigid and flexible directions. Theoretical calculations, finite-element simulations and experiments were used to investigate the mechanical properties of the BLMMs, which have great potential for applications in construction, collapsible equipment, and flexible structures.
COMPOSITE STRUCTURES
(2021)
Article
Physics, Multidisciplinary
Yan Chen, Guoping Chen, Gen Li, Huan He
Summary: This study investigates the propagation of flexural waves of membrane acoustic metamaterials and waveguide effects through modal analysis, calculating flexural band gaps and analyzing local resonance and Bragg scattering mechanisms. Topological waveguide plates are designed based on structural asymmetry.
Article
Mechanics
X-L Gao
Summary: In this study, closed-form expressions for critical velocities and middle-surface displacements of anisotropic tubes subjected to a uniform internal pressure moving at a constant speed were derived using a first-order shear deformation (FSD) model. The model incorporates transverse shear and rotary inertia effects and utilizes general constitutive relations for orthotropic elastic materials. The derived formulas provide a unified treatment of various composite and metallic cylindrical shells. By neglecting specific effects, the general formulas are reduced to existing formulas for special cases. A numerical example is presented to demonstrate the effectiveness of the new model.
Article
Physics, Applied
De-Wei Kao, Jung-San Chen, Yu-Bin Chen
Summary: This work proposes a locally resonating system for multi-frequency vibration suppression. The bandgap region can be adjusted by varying the geometric parameters, and an analytical model is introduced to accurately predict the bandgap frequencies. The theoretical predictions are validated by finite-element analysis and experiments, and it is found that adjacent cells with different arch-mass distributions can generate two pairs of flexural bandgaps.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Aerospace
Qinyu Li, Oscar Ainsworth, Giuliano Allegri, Jie Yuan, Fabrizio Scarpa
Summary: This study evaluates the use of adaptive wings and Kirigami technologies for morphing airframe applications. A cellular Kirigami wingbox with an adaptive hinge is designed and manufactured, and its mechanical properties are numerically evaluated. The results show the feasibility of using this concept for morphing/adaptive small to medium-scale air vehicles from a structural and aeroelastic perspective.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
C. Esteve, J. M. Gosselin, P. Audet, A. J. Schaeffer, D. L. Schutt, R. C. Aster
Summary: This study measures fundamental-mode Rayleigh wave group velocity dispersion from regional earthquakes and reveals azimuthally anisotropic structures in the crust and upper mantle of the northern Canadian Cordillera (NCC) using transdimensional Bayesian tomography. The results show coherent deformation with fast-axis alignment along major tectonic structures in the NCC. Anomalously low V-S structures and high-velocity regions at different depths in the crust and uppermost mantle are observed, providing insights into the thermal and tectonic processes in the region. Variations in the dip direction of high-velocity regions and the presence of low-velocity regions between faults are interpreted as reflecting different geodynamic processes beneath the NCC.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)