Article
Materials Science, Multidisciplinary
Oemer Civalek, Buesra Uzun, Mustafa ozgur Yayli
Summary: This paper proposes a torsional vibration model of a restrained nano-sized rod with deformable boundary conditions, which can effectively be applied to practical and non-idealized torsionally vibrating problems. The study focuses on two size parameters influencing the torsional dynamics of restrained nanorods, and demonstrates validation and comparisons with other non-classical elastic models.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
Pham Toan Thang, Phuong Tran, T. Nguyen-Thoi
Summary: This research paper investigates the vibrational responses of functionally graded carbon nanotube-reinforced composite nanoplates considering the effect of nonlocal parameter and strain gradient coefficient. By studying four types of CNT distribution under small length scale effects, the study aims to estimate the fundamental natural frequencies in FG-CNTRC nanoplates. The mathematical modeling and analytical solutions provide insights into how the small length-scale influences the vibrational behavior of nanoplates.
APPLIED MATHEMATICAL MODELLING
(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
Mechanics
Buesra Uzun, Omer Civalek, Mustafa Tzgur Yayli
Summary: In this study, the size-dependent torsional and longitudinal free vibrations of restrained saturated porous nanorods are investigated using a higher-order elasticity theory. The strain gradient elasticity model is employed to overcome the inconsistencies of the classical elasticity model. The proposed higher-order model provides a well-posed boundary value problem for any small size parameter value. The dynamic response of the nanorods is significantly influenced by the elastic spring coefficients, small-scale parameter, and saturation.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Physics, Condensed Matter
Jingjing Feng, Huajian Yu, Sai Ma, Shuying Hao, Ruiqin Wu
Summary: This paper examines the axial vibration behavior of mass sensors based on single-walled carbon nanotubes and establishes frequency equations and response relationships to describe their vibration characteristics. By combining theoretical analysis and molecular dynamics simulations, the influence of various physical factors on vibration behavior is studied, and methods to improve sensitivity are proposed.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Mechanics
Rouzbeh Mahmoudi, Abbas Barati, Mohammad Hosseini, Amin Hadi
Summary: This paper presents a numerical solution for torsional vibration analysis of a functionally porous nanotube under a magnetic field, utilizing the nonlocal couple stress theory to capture the size effect in microscale. The study examines the torsional vibration behavior of functionally porous nanotubes with magnetic field based on the nonlocal couple stress theory. It was found that different materials exhibit varying softening and hardening behaviors in microscale.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
O. Hrytsyna, J. Sladek, V. Sladek, Q. Deng, M. Hrytsyna
Summary: The modified strain gradient theory (MSGT) is developed to analyze the free vibration of elastic centrosymmetric tubes. The theory considers flexoelectric and micro-inertia effects and includes various parameters such as strain, stretch gradient, rotation gradient, dilatation gradient, polarization vector, and electric quadrupoles. The governing equations and boundary conditions are derived from the Hamilton variation principle, and the torsional vibration problem is solved analytically for non-piezoelectric nanotubes with fixed edges. The study investigates the influence of nanotube geometry, flexoelectric coefficient, micro-inertia, and micro-stiffness parameters on the natural frequency.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Xiao-Jian Xu
Summary: This study addresses the paradox of abnormal frequencies in the free vibration of nonlocal cantilever beams within the framework of nonlocal strain gradient theory. By updating the inconsistencies of reported boundary conditions and proposing a method for calibrating size-effect parameters, the numerical results demonstrate the model's capability in capturing the size-dependent mechanical properties of materials, whether exhibiting stiffness-hardening or stiffness-softening effects.
THIN-WALLED STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
S. Ducottet, A. El Baroudi
Summary: In this paper, a theoretical investigation on the radial vibration of an isotropic elastic nanosphere is conducted. The frequency equation is obtained based on a nonlocal elastic constitutive law, and the validity and accuracy of the theoretical approach are verified through comparisons with literature and numerical examples. The results show that the vibration behavior of the nanosphere is greatly influenced by its size and nonlocal and strain gradient parameters, particularly when the nanosphere radius is smaller than a critical radius. The obtained frequency equation is therefore useful for interpreting experimental measurements of vibrational characteristics of nanospheres.
Article
Mechanics
Farshad Khosravi, Seyyed Amirhosein Hosseini
Summary: This article investigates the forced and free dynamic torsional vibrations of single-walled carbon nanotubes embedded in a viscoelastic medium under a harmonic external torque. It introduces Eringen's nonlocal elasticity to consider the small size effect of nanostructures. The governing equation is simplified to an ordinary differential equation using the Galerkin method in the time domain. The study explores the effects of various parameters on the angular displacement, including the nonlocal parameter, damping ratio, damping coefficient, stiffness of the viscoelastic medium, excitation frequency, geometry, and mass moment of inertia. The results are validated using a finite difference method and compared with a previous study.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mathematics, Applied
M. Jahangiri, M. Asghari
Summary: The non-classical continuum theory of strain gradient elasticity effectively captures small-scale effects in micro-structures. A formulation is developed to investigate the coupled torsional-flexural vibrations of micro-rotors considering inertia nonlinearities. The strain gradient theory predicts more reliable results for micro-rotors with thin shafts compared to classical continuum mechanics.
APPLIED MATHEMATICS AND COMPUTATION
(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
Mechanics
Yujie Zhang, Saeid Sahmani, Zhicheng Yang, Babak Safaei
Summary: This study investigates the nonlinear three-dimensional dynamical stability of smart microshells manufactured from functionally graded piezoelectric materials. By considering both nonlocal stress and couple stress tensors, the authors develop a unified three-dimensional small-scale-dependent shell model and propose an efficient numerical strategy to analyze the size-dependent dynamic stability paths. The results demonstrate the significant influence of changing the sign of external electric voltage and temperature change on the softening and stiffening characteristics of the microshells. Additionally, the combination of axial compression and positive electric voltage actuation leads to a shift in the bifurcation point and a reduction in linear and nonlinear frequencies.
Article
Biology
Babak Alizadeh-Hamidi, Reza Hassannejad, Yadollah Omidi
Summary: Nanostructured lipid carriers are used to control drug release, with dynamic behavior affected by temperature. Using the Timoshenko beam model increases accuracy, while investigating bending vibrations of lipid nano-tubules has made progress.
COMPUTERS IN BIOLOGY AND MEDICINE
(2021)
Article
Engineering, Mechanical
Busra Uzun, Omer Civalek, Mustafa Ozgur Yayli
Summary: This study presents an analysis of axial free vibration of small size-dependent nanorods subjected to deformable restrained boundary conditions. The formulation is rewritten without using any undeformable boundary conditions and considers gradually deformable boundary conditions. The eigenvalue problem is constructed using Fourier sine series and Stokes' transformation, and higher-order elasticity model is employed to consider strain gradient stress field and nonlocal elastic stress field. The validity of the procedure is verified through numerical results and the effects of small-scale parameters on the dynamic response of nanorods are discussed.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Song Guo, Yuming He, Zhenkun Li, Jian Lei, Dabiao Liu
INTERNATIONAL JOURNAL OF PLASTICITY
(2019)
Article
Mechanics
Jian Lei, Yuming He, Zhenkun Li, Song Guo, Dabiao Liu
COMPOSITE STRUCTURES
(2019)
Article
Mechanics
Lei Liu, Shimin Zheng, Dabiao Liu
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Instruments & Instrumentation
W. Ali, D. Liu, J. Li, A. D. Pery, N. Herrada, D. Mills, R. A. Owen, P. A. Burton, D. Dong, G. Gannaway, A. J. Bushby, D. J. Dunstan
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Applied
Fuqiang Wan, Hang Ping, Wenxuan Wang, Zhaoyong Zou, Hao Xie, Bao-Lian Su, Dabiao Liu, Zhengyi Fu
Summary: Biological materials possess excellent mechanical properties due to their organized structures at different scales. This study introduces a stress-induced method to fabricate anisotropic alginate fibers by incorporating aligned hydroxyapatite nanowires. The detailed structural characterization reveals a bone-like structure of the reinforced alginate fibers, showing promising mechanical properties.
CARBOHYDRATE POLYMERS
(2021)
Article
Engineering, Mechanical
Fenfei Hua, Dabiao Liu, Yuan Li, Yuming He, D. J. Dunstan
Summary: This study investigates the mechanical properties of thin foils in bending, tension, and constrained layers through experiments and simulations. The passivated layer significantly increases the flow stress of the foil, while the dissipative gradient terms contribute to the increased yield strength and the energetic gradient terms lead to increased strain hardening and an anomalous Bauschinger effect.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Mechanics
Lei Liu, Dabiao Liu, Xinxin Wu, Yuming He
Summary: A quantitative approach for guiding the optimal structural design of multi-strand ropes with hierarchical helical structures has been developed, focusing on optimizing the structural pattern to maximize load-bearing capacity and minimize global torque. The study identifies favorable structural patterns and emphasizes the beneficial effect of crisscross arrangement of strands or wires within the multi-strand ropes for achieving torque-balanced state. Structural parameters have a significant impact on the global mechanical behavior of ropes, with the initial helix angle of the outer strands playing a crucial role in the axial stiffness of wire ropes.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Tong Luo, Fenfei Hua, Dabiao Liu
Summary: This study investigates the plastic behaviors of thin metallic foils, such as size effect, Bauschinger effect, and passivation effect, under cyclic bending using the strain gradient visco-plasticity theory. Finite element simulations are conducted to analyze the cyclic bending of elasto-viscoplastic thin foils with passivated and unpassivated surfaces, as well as the transition from a passivated surface to an unpassivated one. The results show that the dissipative and energetic gradient terms play crucial roles in influencing the yield strength and strain hardening of the foils, while the surface passivation effect increases both the normalized bending moment at initial yielding and strain hardening.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Mechanics
Jianhui Hu, Lei Liu, Liang Zeng, Yuming He, Dabiao Liu
Summary: Twist insertion is an efficient method for producing twisted and coiled polymer muscles. A novel in situ torsion tester is developed to measure the torsional behavior of filaments under axial forces. The critical torques for different instabilities are obtained and compared with the predictions of different models. The results show good agreement between experimental data and model predictions, providing valuable insights into the mechanics of filament-based artificial muscles.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Instruments & Instrumentation
Jianhui Hu, Liang Zeng, Peng Hu, Yuming He, Dabiao Liu
Summary: The torsional properties of single fibers have significant effects on fabric performance. A new high-resolution torsion tester has been developed to accurately measure these properties, demonstrating high anisotropy in the mechanical properties of various fibers.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Engineering, Mechanical
Jianfeng Zhao, Bo Zhang, Dabiao Liu, Avraam A. Konstantinidis, Guozheng Kang, Xu Zhang
Summary: This study has reformulated Aifantis' SGP model by incorporating a power-law relation for strain-dependent ILS and considering the grain size effect. The results show that the ILS depends on both the sample size and grain size and can be described by the strain hardening exponent.
ACTA MECHANICA SINICA
(2022)
Article
Materials Science, Multidisciplinary
Ruyan Sun, Dabiao Liu, Zhi Yan
Summary: This work presents a finite element approach for analyzing flexoelectric beam energy harvesters with nonuniform cross-sections. A two-node finite element model with 10 degrees of freedom is proposed, using Hermite polynomials to satisfy the higher order continuity requirement. The proposed method is validated using analytical solutions for a flexoelectric actuator. Results show that energy harvesters with nonuniform cross-sections outperform rectangular ones.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Song Guo, Yuyang Xie, Jian Lei, Shihao Han, Dabiao Liu, Yuming He
Summary: This study experimentally investigates the coupled effect of specimen size and grain size on the stress relaxation of micron-sized copper wires. It is found that the specimen and grain size decrease leading to an increase in the relaxation process and a decrease in activation volume. The yield strength is affected by the ratio of specimen diameter to grain size, with a critical value of 3.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Physics, Applied
Hao Liu, Lei Liu, Zhi Yan, Yuming He, David J. Dunstan, Dabiao Liu
Summary: The morphological transitions of slender ribbons under tension and torsion are studied using a combination of experiment and theory. A unified phase diagram is constructed, and two types of shape evolutions are identified. The mechanical behavior of the stretched and twisted ribbon is described based on an energy method, and the study reveals the dependence of morphology transitions on aspect ratio and tension.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Lei Liu, Hao Liu, Yuming He, Dabiao Liu
Summary: This study investigates the mechanics and topologically complex morphologies of twisted rubber filaments using a combination of experiment and finite strain theory. A finite strain theory for hyperelastic filaments under combined tension, bending, and torsion has been established, and an experimental and theoretical morphological phase diagram has been constructed. The results accurately determine the configuration and critical points of phase transitions, and the theoretical predictions agree closely with the measurements.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)