Article
Computer Science, Interdisciplinary Applications
Hossein Bisheh
Summary: This study proposes a new analytical approach to determine wave propagation characteristics in smart composite plates considering the transverse polarization of piezoelectric materials. The results show that the presence of piezoelectric actuators has a significant effect on the wave phase velocity variations within different wavenumbers, as well as the effects of laminate stacking sequence and host plate material properties.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mechanics
Hsin-Yi Kuo, Li-Huan Yang, Po-Chun Huang, Ernian Pan
Summary: This paper compares the dispersion curves and mode shapes of magneto-electro-elastic laminated composites with different layering directions. The wave characteristics of piezoelectric and piezomagnetic laminates with the layering direction along y-axis or z-axis are investigated using the generalized pseudo-Stroh formulation and propagator matrix approach. The differences in dispersion curves and mode shapes of the sandwich plates demonstrate the important role of the layering direction. The decoupling feature of Lamb wave and SH wave is consistent with the static case when the layering direction is along y-axis, but differs from the static case when the layering direction is along z-axis.
Article
Mechanics
Kalyan Boyina, Raghu Piska, Sundararajan Natarajan
Summary: A nonlocal strain gradient model is developed for the buckling analysis of functionally graded Euler-Bernoulli beam subjected to thermo-mechanical loads. The governing equations incorporate the effects of nonlocal and strain gradient parameters. Thermal properties over the cross section are graded using the power law. The proposed model compares well with the existing literature in the limiting sense of no nonlocal and gradient effects.
Article
Materials Science, Multidisciplinary
X. Tang, J. Yang
Summary: This study presents a novel grain-scale model to investigate the effect of particle morphology on elastic wave propagation in granular materials. The results show that increasing particle aspect ratio leads to a notable rise in elastic wave velocity, while increased particle blockiness causes a moderate reduction in velocity. Furthermore, particles with higher aspect ratio have a broader range of transmitted frequencies compared to those with greater blockiness.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Multidisciplinary
Igor Berinskii, Victor A. Eremeyev
Summary: This study discusses the dynamics of a relatively simple origami-inspired structure using discrete and continuum models. The continuum model, derived from the discrete model, accurately captures the behavior of origami structures, which is important for determining material properties and conducting nondestructive evaluations.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Physics, Multidisciplinary
Somaye Jamali Shakhlavi, Shahrokh Hosseini-Hashemi, Reza Nazemnezhad
Summary: In this study, a comprehensive modeling of the geometrically nonlinear free axial vibration of a nanorod in the presence of nonlocal and inertial of lateral motions effects is presented. The results show that nonlocal and inertial effects lead to extra internal modal interactions for nanorod vibrations.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Geochemistry & Geophysics
Ziqi Jin, Zhishui Liu, Ying Shi, Weihong Wang
Summary: Although seismic wave attenuation is frequency-dependent, most existing Q estimation methods assume that Q is constant. This limits the effective application of rock-physics Q models to link frequency-dependent Q estimations and rock properties. By employing suitable rock-physics modeling and scaling, a new frequency-dependent Q estimation method, called the two-parameters spectral ratio method, is developed. This method provides more accurate and reliable Q results by establishing a connection between rock-physic models, logging, and seismic data for better interpretation of subsurface properties.
Article
Acoustics
Santanu Manna, Rahul Som
Summary: In this article, the characteristics of flexural edge waves on a piezoelectric structure are studied using an elastic foundation. The microscale effect on edge wave propagation is investigated using nonlocal elasticity theory. The analysis shows significant differences in dispersion curves for piezoelectric plates with different foundations and nonlocal parameters.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Materials Science, Multidisciplinary
Victor Pacheco-Pena, Diego M. Solis, Nader Engheta
Summary: This opinion article provides a brief summary of the background materials and recent developments in the field of temporal and spatiotemporal media, and offers opinions on potential challenges, opportunities, and open research questions for manipulating fields and waves in four dimensions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Acoustics
Giuseppe Saccomandi, Luigi Vergori
Summary: The equations of nonlinear elastodynamics and their applications have been a topic of interest for mathematicians since the second half of the 20th century. This paper focuses on the wave propagation in isotropic elastic solids, considering the effects of dispersion. The study includes the determination of global solutions, exact solutions for longitudinal travelling waves within the fourth-order theory of elasticity, and the derivation of asymptotic reductions for waves of small amplitudes.
Article
Physics, Fluids & Plasmas
B. L. Kim, C. Chong, S. Hajarolasvadi, Y. Wang, C. Daraio
Summary: In this study, the response of a one-dimensional phononic lattice with time-periodic elastic properties is investigated in both linear and nonlinear regimes using experimental, numerical and theoretical approaches. It is found that wave-number band gaps emerge under small-amplitude excitation, while large-amplitude responses are stabilized via the nonlinear nature of the magnetic interactions, resulting in a family of nonlinear time-periodic states. Controlling acoustic and elastic wave propagation by balancing nonlinearity and external modulation offers potential applications in signal processing and telecommunication devices.
Article
Physics, Applied
Noah Kruss, Jayson Paulose
Summary: This study presents a mechanism for one-way amplification of sound waves across an entire frequency band using spacetime-periodic modulation of local stiffnesses. By modulating the local parameters in the active metamaterials, the forward-propagating acoustic band modes can be amplified while no amplification occurs in the reverse-propagating band. The amplification is nearly uniform across the lowest-frequency band, enabling amplification of wave packets while preserving their speed, shape, and spectral content.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Mechanical
Xiang Liu, Zhaoming Lu, Sondipon Adhikari, YingLi Li, J. Ranjan Banerjee
Summary: This paper proposes two significant developments of the Wittrick-Williams (W-W) algorithm, which combines dynamic stiffness (DS) model and the W-W algorithm for accurate and efficient wave propagation analysis. The method is applied to hexagonal honeycomb lattice structures and compared with finite element method (FEM) results. It is shown that the proposed method is at least two orders of magnitude more computationally efficient and provides accurate eigenvalues and eigenmodes.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mathematics, Applied
D. S. Almeida Almeida Jr, M. L. Santos, J. E. Munoz Rivera, M. J. dos Santos
Summary: In this paper, we analyze the exponential stability of a one-dimensional porous-elasticity system with an indefinite damping mechanism. We prove that the system is exponentially stable under certain conditions on the coefficients and the damping term. The decay rate is explicitly described for constant damping. The approach is inspired by the work of Munoz Rivera and Racke and shows that the system exhibits spectrum determined growth (SDG).
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2023)
Article
Geochemistry & Geophysics
Andrey V. Lebedev
Summary: Acoustic logging is an important experimental technique widely used in exploration geophysics, prone to errors due to microscopic heterogeneity of rocks outside the borehole. Approximate descriptions can be adequate, leading to faster data processing and time savings.