Article
Optics
D. A. Roman-Garcia, F. H. Maldonado-Villamizar, B. Jaramillo-Avila, B. M. Rodriguez-Lara
Summary: We demonstrate the scattering control of Gaussian-like wave packets with constant envelope velocity and invariant waist using coupled resonator optical waveguides (CROW) and an external resonator. The analytical and approximate results are in good agreement with numerical simulations. Various configurations, including light trapping, wave packet splitting, and non-local Mach-Zehnder interferometer, are engineered using an external resonator coupled to a CROW.
Article
Chemistry, Physical
Lin Liu, Yongju Gao, Yikun Liu, Meiling Xu, Shuhua Yang, Kui Li, Songfang Zhao, Duxia Cao, Jong-Hyun Ahn
Summary: This study presents a versatile strain-sensing platform using metal-organic framework-derived porous carbon-welding carbon nanotubes (MPC-w-CNTs) percolation networks. The platform shows excellent sensing performances, detecting a wide range of deformations with high sensitivity and short response time. The unique junction bonding strategy offers potential for developing stretchable electronics using other nanomaterial systems.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Alireza Babaei
Summary: This technical paper investigates the forced longitudinal vibration response of non-local strain gradient rods and compares it with other types of rods, analyzing the effects of different parameters on system performance and emphasizing the importance of non-classical parameters for system response.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Chemistry, Physical
Danvendra Singh, Amit Rawal
Summary: In this study, a comprehensive theoretical framework is proposed to investigate the tensile mechanics of complex random networks of multi-walled carbon nanotubes. By constructing a shell-based analytical model, the Young's modulus of multi-walled carbon nanotubes is successfully reduced and the tensile strength of Buckypaper is modeled. The good agreement between the theoretical model and experimental results validates the predictive capability of the model.
Article
Chemistry, Applied
Shuang Sun, Yizhe Xu, Xieraili Maimaitiyiming
Summary: The stability of 3D printed wearable flexible sensors is crucial for the practical application of hydrogel in wearable electronic devices and human-machine interfaces. A simple strategy to prepare in situ polymerized PANI conductive substances on CNTs was presented. The hydrogel sensor shows excellent mechanical properties and enables monitoring stress, strain, temperature, and human motion, with high fatigue resistance.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Multidisciplinary Sciences
Lianchao Wang, Julio A. Iglesias Martinez, Gwenn Ulliac, Bing Wang, Vincent Laude, Muamer Kadic
Summary: In this paper, a model for non-reciprocal and non-Newtonian mechanical metamaterials is demonstrated by combining the concept of local resonances and fixing boundaries. Via computational models and impact experiments, the authors show that stiffness substantially changes as a function of the loading velocity.
NATURE COMMUNICATIONS
(2023)
Article
Mechanics
Nagham Mawassy, Hilal Reda, Jean-Francois Ganghoffer, Hassan Lakiss
Summary: This study computes the effective flexoelectric properties of heterogeneous piezoelectric materials using extended Hill macro-homogeneity condition and considering higher gradient effects. The obtained homogenized properties are utilized for analyzing the wave propagation attributes of piezoelectric composites and investigating the dispersion relations of flexoelectric media.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Andrea Bacigalupo, Luigi Gambarotta
Summary: This paper focuses on dynamic homogenization of lattice-like materials with lumped mass at nodes to obtain energetically consistent models for accurate descriptions of the discrete system's acoustic behavior. By utilizing proper mapping and enhanced continualization, equivalent continuum models with non-local terms are derived, achieving energy-consistent differential equations for effective representation of the system's behavior.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Mathematics
Teodor M. Atanackovic, Diana Dolicanin Djekic, Ersin Gilic, Enes Kacapor
Summary: This article analyzes the wave equation for spatially one-dimensional continuum with a non-local type constitutive equation. The deformation is described by a specially selected strain measure with a general fractional derivative of the Riesz type. The resulting equations are solved using Fourier and Laplace transforms in the space of tempered distributions. The properties of the solution are examined and compared with the classical case.
Article
Acoustics
Jiayin Dai, Yongshou Liu, Guojun Tong
Summary: This article investigated the wave propagation characteristics of functionally graded nanotubes, finding that a smaller exponent n in the volume fraction function leads to a better system performance. Additionally, there is a positive correlation between stability and both temperature variation and nonuniformity of temperature variation.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Review
Materials Science, Multidisciplinary
Rui Wang, Luanfa Sun, Xiaoyang Zhu, Wensong Ge, Hongke Li, Zhenghao Li, Houchao Zhang, Youqi Huang, Zengcheng Li, Yuan-Fang Zhang, Jiawei Zhao, Quan Xu, Hongbo Lan
Summary: This paper systematically summarizes the advances in flexible resistance-type strain sensors based on carbon nanotubes (CNTs), including the strain sensing mechanisms, sensor performance parameters, fabrication methods, and applications. The future challenges and outlook of CNT flexible strain sensors are also discussed.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Mathematics, Applied
Kalyan Boyina, Raghu Piska
Summary: This work investigates wave propagation in a viscoelastic Timoshenko nanobeam under the influence of surface stress and magnetic field effects. The study provides a mathematical model and closed-form solutions for such scenarios. The results indicate that the introduction of surface stress values increases the damping ratio of flexural and shear waves.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Chemistry, Multidisciplinary
Yi Han, Shaoqiang Dong, Jiawei Shao, Wei Fan, Chunyan Chi
Summary: The successful synthesis of a carbon nanobelt (CNB) and the characterization of its unique structure and properties were reported in this study. The findings provide a new strategy for the synthesis of highly strained CNBs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Yu-Chi Su, Tse-Yu Cho
Summary: This article investigates wave propagation in embedded single-walled carbon nanotubes by modeling them as nonlocal Timoshenko beams. The analysis reveals that small scale effects smooth out transient responses and result in instantaneous wave propagation. The behavior of wave propagation is affected by the radius of the carbon nanotube, but not by its chirality. The dispersion relations with different small scale parameters are also examined.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mathematics, Interdisciplinary Applications
Xue Sang, Zongguo Zhang, Hongwei Yang, Xiaofeng Han
Summary: In this paper, bidirectional propagation system local fractional equations are researched within the scope of the local fractional derivative theory. Exact traveling wave solutions of non-differentiable type are obtained, and it is proven that these equations can describe the interaction of fractal waves and has important significance in mathematical physics.
FRACTAL AND FRACTIONAL
(2022)
Article
Mechanics
A. D. Lai, J. F. Jia, J. L. Qu, J. Y. Wang, J. B. Sun, Z. H. Zhou, X. S. Xu, C. W. Lim
Summary: This study investigates the influence of local thinning thickness defects on the buckling of cylindrical shells. A static buckling model is established based on the Hamiltonian system, and the complete symplectic eigensolutions are superimposed to derive the buckling modes of the cylindrical shell with defects. The influence of different defect shapes on the shell's buckling is analyzed by constraining the defect volume, and it is concluded that defects of exponential function are more harmful.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Multidisciplinary
Guifeng Wang, Yanhong Guan, Zhenyu Chen, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim
Summary: This article presents theory and design approaches for three thermally controlled subwavelength acoustic topological insulators and analyzes their band structures and topological interface states. The results show that these structures can achieve active control of acoustic waves, providing a new method for controlling acoustic topological modes and sound wave propagation.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Aerospace
Baisheng Wu, Yixin Zhou, C. W. Lim, Huixiang Zhong
Summary: This paper proposes a new analytical approach for constructing approximate solutions to the elliptic Kepler equation. A high-accuracy initial approximation is established using the piecewise Pade ' approximation, and the Schroder method is applied to further improve its accuracy. In general, one Schroder iteration is sufficient to obtain a highly accurate approximate solution. The proposed approach is a direct method that requires only solving a cubic equation and evaluating two trigonometric functions. The accuracy and effectiveness of the approximate, analytical solutions are proved by comparing them with solutions obtained by other numerical procedures.
Article
Engineering, Mechanical
Yiwen Ni, Shengbo Zhu, Zhenzhen Tong, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim, M. Ahmer Wadee, Stylianos Yiatros
Summary: An accurate nonlinear HTEE buckling analysis of piezoelectric fiber-reinforced composite cylindrical shells subjected to the coupled loading effects of axial compression and hydrostatic pressure was established, considering the nonuniform prebuckling effect. Nonlinear governing equations were derived based on higher-order shear deformation theory and Novozhilov's nonlinear shell theory. Accurate critical buckling stresses, pressures, and explicit buckling modes for both axisymmetric and nonaxisymmetric buckling were obtained through the Galerkin method. A comprehensive parametric study of geometric parameters, end conditions, distribution patterns, and hygrothermal-electric multiphysical fields on the buckling behavior of HTEE composite cylindrical shells was also conducted and discussed.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Jiabin Sun, Zhenhuan Zhou, Xueqing Cao, Qifeng Zhang, Qilin Zhang, Ziguang Jia, Wei Sun, Zhenzhen Tong, Xinsheng Xu, C. W. Lim
Summary: Pattern transformation in a periodic porous structure has led to the development of multifunctional mechanical metamaterials with negative Poisson's ratio. Inspired by this, a novel porous cylindrical shell is constructed with staggered openings, which can undergo controlled waist deformation under axial compression. This design shows potential for applications in biomedical engineering, underwater detection, and fluid machinery.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Acoustics
Guifeng Wang, Yuanting Wei, Zhenyu Chen, C. W. Lim
Summary: Due to their great application potential in programmable wave transportation, topological metamaterials have received significant research attention in recent decades. This article presents an acoustic metamaterial composed of a perforated nylon substrate and a ceiled air-flowing channel. The resonance frequency and topological phases of the metamaterial are tuned by filling the holes arranged in a honeycomb lattice with water. By adjusting the height of water columns, two subwavelength bandgaps are opened, leading to controllable bandgap and topological phase transitions. The study explores the dependence of topological protected interface mode frequency and quality factor on water height and proposes a design strategy to obtain high-quality topological protected interface mode at the desired frequency. Additionally, the article demonstrates topological rainbow trapping to terminate waves at different frequencies and locations. The controllable bandgap and topological protected interface mode enable the design of topological structures with simpler structures and lower cost.
Article
Thermodynamics
Guifeng Wang, Fan Shi, Zhenyu Chen, Yue Yu, C. W. Lim
Summary: The interest in phononic crystals and acoustic metamaterials has been a hot topic in recent years. This study proposes a prestressed metamaterial beam with actively tunable piezoelectric springs attached to multiple local resonators. The theoretical analysis of the system is conducted using the Euler-Bernoulli beam theory and Timoshenko beam theory. The dispersion relation and transmission ratio are analytically computed using the spectral element method, and excellent agreement with the benchmark is reported. The paper also investigates the influence of external axial force, resonator number, and mass on the bandgap range and attenuation behavior, and demonstrates the active control of bandgap range and frequency.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Civil
Chen Liang, Zhenyu Chen, Guifeng Wang, C. W. Lim
Summary: This study investigates the thermal vibration characteristics of sandwich cylindrical shells made of functionally graded materials (FGMs). The shells are modeled using the Kirchhoff-Love shell theory, accounting for porosity effects that vary with the mixing degree of constituent materials. The material properties are temperature-dependent and show graded variation along the thickness direction. Analytical solutions for the natural frequencies are determined and compared with numerical simulations and data from the open literature. The study comprehensively examines the effects of various parameters on the thermal vibration characteristics of the composite shell structures.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Construction & Building Technology
Wisal Ahmed, C. W. Lim
Summary: The employment of recycled aggregate concrete (RAC) for sustainable infrastructure development has gained special interest due to the emphasis on resource conservation and environmental protection. This experimental study investigates the effect of elevated temperatures on the residual properties of RAC strengthened with chopped basalt fiber (BF) and pozzolana slurry treated recycled concrete aggregate (TRCA). The findings show significant enhancement in residual properties and improved matrix quality of the modified recycled concrete prepared by combined utilization of BF and TRCA.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Zoe Yaw, Weijian Zhou, C. W. Lim
Summary: In this paper, a piezoelectric-based elastic metasurface with hybrid shunting circuits is proposed for adaptive control of flexural waves. By tuning negative capacitance and inductance simultaneously, the metasurface achieves a phase shift ranging from 0-2 pi with high transmission. Compared to existing single shunting circuit designs, the proposed metasurface performs better. Analytical modeling and finite element analysis are conducted to study the transmission and phase shift of the metasurface. Numerical simulations demonstrate switchable functionalities of wave refraction and focusing at different working frequencies.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Astronomy & Astrophysics
Yixin Zhou, Baisheng Wu, C. W. Lim, Huixiang Zhong
Summary: This article introduces a homologous collapse process of a sphere with uniform density, which is used to model the formation of astronomical objects. By combining the Pade approximation and the Schroder formula, the authors construct an approximate analytical solution for the radius as a function of time. This method is a direct approach that only requires solving a cubic equation and evaluating three trigonometric functions, demonstrating higher accuracy and effectiveness compared to existing methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Engineering, Civil
Wisal Ahmed, C. W. Lim
Summary: Recycling of construction and demolition waste is an effective way for sustainable development, recycled concrete, and environmental protection. This study investigated a new strength enhancing approach by adding basalt fiber (BF) to improve the strength and fracture properties of recycled concrete. The experimental results showed that the addition of BF significantly increased the fracture energy, fracture toughness, flexural strength, and elastic modulus of recycled concrete. The digital image correlation analysis revealed a continuous spread of strain contours in the BF modified concrete, indicating higher strain values compared to the reference sample. Microstructure observation confirmed better concrete matrix quality and BF-cement matrix interaction, demonstrating the feasibility of the applied strength enhancing technique for high strength fiber reinforced recycled concrete.
Article
Engineering, Multidisciplinary
Guanghui Xia, Xiaofang Kang, C. W. Lim, Yunlin Liu, Dong Chen, Liping Tang, Tingting Han
Summary: Based on parametric excitation and real-life low-frequency vibration, this study investigates the steady-state response of a piezoelectric energy harvesting system composed of a cantilever beam with a tip mass and horizontal excitation at the fixed end. By utilizing Hamilton's principle, the nonlinear partial differential equation of the cantilever piezoelectric energy harvesting system with an additional tip mass is derived and analyzed. The Galerkin method is used to reduce the nonlinear partial differential equation to an electromechanical coupling system that governs the cantilever piezoelectric energy harvesting system with a tip mass under parametric excitation. The first-order resonance response of the harvesting system is studied using the method of multiple scales, and the influence of different impedance and tip mass on the system performance is summarized and concluded.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Construction & Building Technology
Wisal Ahmed, C. W. Lim
Summary: Fiber hybridization is an effective method to enhance the mechanical properties and durability of recycled concrete. However, previous research mainly focuses on the basic mechanical properties and neglects the multicriteria-based performance assessment. In this study, eleven mix formulations with different fiber combinations and mineral admixtures were evaluated and compared. The results showed that mix formulations with hybrid fibers had significant improvements in compressive strength, splitting tensile strength, and flexural strength. The freeze-thaw assessment indicated that using hybrid fibers together with mineral admixtures resulted in superior durability performance. Cost analysis revealed that certain mix formulations had a higher net cost increase. The multicriteria analysis demonstrated that the hybrid fiber-based mix formulations had the best performance score and ranking.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Anchen Ni, Zhifei Shi, Qingjuan Meng, C. W. Lim
Summary: This study proposes a novel shallow buried periodic in-filled pipe barrier for mitigating surface waves. Through complex dispersion analysis, numerical simulations, and lab-scale experiments, the effectiveness and robustness of the barrier in attenuating surface waves are verified. The energy dissipation induced by material damping and local resonance of in-filled pipes contribute to wave attenuation. The feasibility of these novel wave barriers for mitigating train-induced vibrations is also preliminarily verified.
ENGINEERING STRUCTURES
(2023)
