Article
Engineering, Mechanical
Chaoqun Dang, Anliang Lu, Heyi Wang, Limin Yang, Xiaocui Li, Hongti Zhang, Yang Lu
Summary: This review focuses on the extreme mechanical deformations of diamond at small scales, including ultrahigh hardness, ultralarge bending/tensile elasticity, localized plastic deformation, etc., for structural and functional applications. The modulation of diamond's electronic properties through elastic strain engineering and the exploration of strain-mediated quantum information technologies are highlighted. Prospective research directions for enhancing and utilizing the extreme mechanical behavior of micro/nano-fabricated diamonds are suggested.
EXTREME MECHANICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Ahmad Haghani, Mehdi Jahangiri, Reza Ghaderi
Summary: Due to the introduction of particular responses not present in linear systems, properties of nonlinear systems can lead to inaccurate or misleading results from linear models. Therefore, studying nonlinear vibrations is crucial in structural vibration analysis. This study utilized the stress driven nonlocal theory (SDM) and the strain gradient theory (SGT) to analyze the nonlinear vibrations of a Timoshenko nanobeam. By solving the nonlinear equations of motion using the homotopy analysis method, it was found that the nonlinear natural frequency increased as the dimensionless characteristic parameter increased. The results also showed a high level of agreement with previous research using a linear frequency of Timoshenko beam model based on the SGT.
Article
Mathematics
Ammar Melaibari, Alaa A. Abdelrahman, Mostafa A. Hamed, Ahmed W. Abdalla, Mohamed A. Eltaher
Summary: This study presents a mathematical model for investigating the dynamic behavior of a sandwich perforated nanobeam with flexoelectricity effect. Parametric studies show that the flexoelectric and piezoelectric parameters increase the vibration frequency of the nanobeam, while the nonlocal parameter reduces it.
Article
Engineering, Civil
Xuejie Yue, Xuezheng Yue, Vahid Borjalilou
Summary: This study establishes a comprehensive model to analyze the size-dependent thermoelastic vibrations of Timoshenko nanobeams, highlighting the significant role of nonclassical scale parameters in accurate analysis. The findings suggest that the nonclassical model can capture both stiffness softening and stiffness enhancement characteristic of small-sized structures.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Mechanics
Giovanni Romano, Marina Diaco
Summary: Nonlocal elasticity models are addressed through a general formulation involving source and target fields in dual Hilbert spaces. The focus is on small movements and a geometrically linearized approximation is assumed feasible. The analysis discusses the linear, symmetric, and positive definite relationship between dual fields in the local elastic law, governed by a strictly convex, quadratic energy functional.
Article
Mechanics
T. Gortsas, D. G. Aggelis, D. Polyzos
Summary: Strain gradient elasticity and nonlocal elasticity are two enhanced elastic theories used to explain phenomena that classical elasticity cannot explain. This study aims to derive all the strain gradient elastic theories appearing in the literature via the nonlocal definitions of energy densities and Hamilton's principle.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Physics, Multidisciplinary
A. M. Zenkour, A. F. Radwan
Summary: This paper analyzes deflection, stresses, buckling, and vibration of a porous functionally graded curved nanobeam with different boundary conditions using a nonlocal strain gradient theory. The study shows that the porosity factor, nonlocal, length-scale parameters, and gradient index have significant influences on the behavior of the nanobeam.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Computer Science, Interdisciplinary Applications
Pham Toan Thang, Dieu T. T. Do, Jaehong Lee, T. Nguyen-Thoi
Summary: This paper presents an in-depth study on the influence of nanoscale parameters on the bending and free vibration responses of functionally graded carbon nanotube-reinforced composite nanoshells. Mathematical formulas and numerical calculations are used to investigate the effect of nanoscale parameters, material properties, and shell shapes on the deflection and fundamental frequency parameters of the nanoshells.
ENGINEERING WITH COMPUTERS
(2023)
Article
Automation & Control Systems
Arman Rajaei, Amir Chizfahm, Ramin Vatankhah, Allahyar Montazeri
Summary: In this study, an adaptive self-organizing fuzzy sliding mode controller is developed for vibration control of an Euler-Bernoulli nanobeam. By considering the mid-plane stretching effect, the control equation of the nanobeam is derived, and two fuzzy controllers are proposed to adjust parameters and improve system response.
EUROPEAN JOURNAL OF CONTROL
(2022)
Article
Mechanics
Yu-fang Zheng, De-yong Qu, Li-chuan Liu, Chang-ping Chen
Summary: In this study, a nonlinear bending model of the nonlocal three-layer magneto-electro-elastic (MEE) laminated nanobeam resting on elastic foundation is established using Reddy's third-order shear deformation theory (RTSDT) and nonlocal elasticity theory. The model considers the geometrically nonlinear equations proposed by von Karman and also takes into account the effects of electric and magnetic potentials in the laminated nanobeam through Maxwell's magnetic-electro equations and boundary conditions. The governing equations are re-expressed in a dimensionless form and simplified using the Galerkin method. The study explores the effects of foundation parameters, nonlocal parameter, stacking sequence, external electric voltage and external magnetic potential on the bending behaviors of MEE laminated nanobeams.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Mathematics, Applied
Pham Toan Thang, T. Nguyen-Thoi, Jaehong Lee
Summary: The main goal of this research paper is to model and analyze bidirectional functionally graded nanobeams using the Timoshenko beam theory and nonlocal strain gradient theory. The study focuses on understanding mechanical behavior, calculating important parameters, and formulating equilibrium and stability equations for a detailed investigation. Specific examples are presented to verify the proposed solution, and the influences of material properties and nonlocal parameter on critical buckling load and transverse deflection are examined.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Mechanics
Ahmed Amine Daikh, Mohammed Sid Ahmed Houari, Mohamed A. Eltaher
Summary: This manuscript examines the bending deflection and stress distribution of sandwich functionally graded nanoplates on variable Winkler elastic foundation using a new quasi 3D hyperbolic shear theory and nonlocal strain gradient theory. The developed model is verified and parametric studies are conducted to illustrate the influences on static deflection and stress distribution. The proposed model can be applied in the design and analysis of NEMS structures under static load.
COMPOSITE STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Ying Han, Libo Gao, Jingzhuo Zhou, Yuan Hou, Yanwen Jia, Ke Cao, Ke Duan, Yang Lu
Summary: Conventionally, tuning material properties can be achieved through methods such as alloying, doping, defect engineering, and phase engineering. Mechanical straining, particularly elastic strain engineering (ESE), is proposed as an effective alternative for continuous and reversible modulation of material properties. Two-dimensional (2D) materials with exceptional mechanical properties are promising candidates for ESE applications. This study demonstrates the use of strain effects to modulate physical and chemical properties for novel functional device applications, and suggests that ultra-large, uniform elastic strain in free-standing 2D monolayers can lead to fundamentally altered electronic and optoelectronic properties for unconventional device applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Computer Science, Interdisciplinary Applications
P. Phung-Van, H. Nguyen-Xuan, Chien H. Thai
Summary: This paper investigates the free vibration analysis of functionally graded graphene platelet-reinforced composites (FG GPLRC) plates using a nonlocal strain gradient isogeometric model based on the higher order shear deformation theory. Various distributed patterns of graphene platelets (GPLs) are considered, and the effects of different parameters on the natural frequencies of the nanoplates are examined. The results obtained in this study can serve as benchmark results for further research on FG GPLRC nanoplates.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mechanics
P. Phung-Van, A. J. M. Ferreira, H. Nguyen-Xuan, Chien H. Thai
Summary: A scale-dependent nonlocal strain gradient isogeometric model is proposed for metal foam nanoscale plates with various porosity distributions, efficiently capturing nonlocal and strain gradient effects. By investigating parameters such as porosity distribution, length-to-thickness ratios, boundary conditions, etc., the model explores static and dynamic deflections of metal foam nanoplates.
COMPOSITE STRUCTURES
(2021)
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
Physics, Applied
Guifeng Wang, Yanhong Guan, Zhenyu Chen, Xinsheng Xu, Zhenhuan Zhou, C. W. Lim
Summary: We design a new topological rainbow trapping device by introducing a topological protected interface mode (TPIM) into the prevailing gradient rainbow device. The dependence of bandgap region and group velocity on the reference foundation stiffness is investigated. We successfully predict and demonstrate TPIM using topological phase transition and Zak phase analysis. Furthermore, we quantitatively evaluate the advancement of topological rainbow devices in vibration amplification and broadband wave attenuation compared to the prevailing gradient device.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(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
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)