Article
Mechanics
Giovanni Tocci Monaco, Nicholas Fantuzzi, Francesco Fabbrocino, Raimondo Luciano
Summary: This study investigates the vibrations and buckling of thin laminiated composite nano plates in hygrothermal environment using second-order strain gradient theory. Numerical solutions for a large number of laminates are provided along with comparisons to classical analytical solutions. Critical temperatures for cross-and angle-ply laminates are also shown in this work.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Haonan Li, Wei Wang, Linquan Yao
Summary: This paper investigates the free vibration behaviors of rotating nano-annular plates and derives the motion equations. The effects of nonlocal parameter, temperature change, inner and outer radius ratio, and rotational velocity on the vibration frequencies are analyzed using numerical examples. The results of this study are of great significance for the further development of this field.
APPLIED SCIENCES-BASEL
(2022)
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
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
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
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
Mathematics
Yan Yang, Fang-Wen Ge, Xiang Liu
Summary: For plate structures, their random parameters can be considered as a two-dimensional random field in the plane. An efficient strategy for the stochastic finite element method was adopted to solve the plate theory considering the two-dimensional random field. The stochastic finite element method was used to establish the plate structural model and the point estimate method was applied to calculate the statistics of random structures. The proposed method can provide help in solving static problems of plate structures.
Article
Engineering, Civil
Dongchang Hou, Lifeng Wang, Jianwei Yan
Summary: This paper proposes a higher-order nonlocal strain gradient plate model that combines nonlocal elasticity theory with strain gradient theory. The model is derived using Hamilton's principle and introduces two higher-order parameters to explain the size effect and dispersive behavior. The meshfree moving Kriging interpolation method is used to calculate the frequency under complicated boundary conditions. The effectiveness of the model is demonstrated by comparing it with other theories.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Amin Vahidi-Moghaddam, Arman Rajaei, Ehsan Azadi Yazdi, Mohammad Eghtesad, Dan Sorin Necsulescu
Summary: This paper investigates the nonlinear forced vibrations of homogeneous Euler-Bernoulli microbeams with clamped-clamped boundary conditions. By incorporating the nonlocal strain gradient theory, the governing nonlinear partial differential equation of motion including mid-plane stretching and damping effects is derived. Through the Galerkin approach, a reduced equation of motion is obtained under a central harmonic force. The perturbation technique is used to examine the nonlinear forced vibration behavior of the microbeam, and the simulation results show the role of size effect on the vibration behavior. Moreover, the effects of different physical parameters on the vibration behavior of the microbeam are studied. Finally, the proposed approach is compared with a numerical solution to validate the accuracy and validity of the presented analytical solution.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Nanoscience & Nanotechnology
Mehmet N. Balci
Summary: This study investigated the longitudinal vibration of a nanorod embedded in viscoelastic medium using nonlocal strain gradient theory. Results showed that the material length scale parameter has an influence on modal frequencies, while elastic and damping parameters have significant impacts on modal frequencies and damping ratios.
ADVANCES IN NANO RESEARCH
(2022)
Article
Engineering, Civil
Leilson J. Araujo, Joao E. Abdalla
Summary: The strain gradient notation finite element method (SGN-FEM) is used to investigate the free-vibration and buckling analyses of plate problems. SGN-FEM employs physically interpretable polynomials in developing finite elements, allowing for the identification and elimination of parasitic shear sources that cause shear locking. The study evaluates the efficiency of corrected models in providing accurate results for free-vibration and buckling, and examines the severity of parasitic shear effects on plate models.
STRUCTURAL ENGINEERING AND MECHANICS
(2023)
Article
Nanoscience & Nanotechnology
Mahmoud M. Selim, Taher A. Nofal
Summary: This work applies Kirchhoff plate theory to investigate the vibrational analyses of nanoplates with surface irregularity, which has not been previously studied. The study reveals that surface irregularity significantly affects the natural frequency of vibrational nanoplates, leading to a decrease in frequency with an increase in irregularity parameter. These findings can be useful for designing oscillators and nanoscale devices where nanoplates serve as a structural component in nanocomposites.
NANOMATERIALS AND NANOTECHNOLOGY
(2021)
Article
Mechanics
Lu Lu, Shuang Wang, Min Li, Xingming Guo
Summary: This study focuses on the free vibration and dynamic stability characteristics of functionally graded composite multilayer microtubes reinforced with graphene platelets under axial mechanical load. By developing a multilayer tube model and analyzing the influences of different parameters, the best reinforcing effect for the composite microtubes is found to be distributing more graphene platelets in the outer layers but fewer in the inner layers.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Jianzhong Zhao
Summary: Serpentine structures have gained increasing interest due to their unique mechanical and physical properties, making them suitable for applications in stretchable electronics, mechanical sensing, and biomedical devices. This study presents a simple analytical model for accurately analyzing the postbuckling displacement and effective rigidity of serpentine structures. By tuning the geometric parameters, a wide range of amplitudes can be achieved for 3D serpentine structures, allowing for compatibility with ultra-low rigidity biological tissues.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2022)
Article
Materials Science, Multidisciplinary
Jianzhong Zhao, Fan Zhang, Xingming Guo, Yonggang Huang, Yihui Zhang, Heling Wang
Summary: The buckling of a single ribbon is the simplest type of instability in mechanics, and postbuckling has recently been used in 3D assembly techniques to create diverse 3D structures. Among these structures, 3D serpentine structures are notable for their low rigidity and high stretchability. An analytical model has been developed to reveal the mechanical behavior of these structures, showing that the postbuckling of serpentine structures follows similar rules as straight ribbons. Using an inverse design strategy, various structures can be formed from planar precursors without spatial-varying cross-sectional parameters. The application of this theoretical model to a multidirectional strain sensor demonstrates its practical utility.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Multidisciplinary Sciences
Lu Lu, Xiangxin Dang, Fan Feng, Pengyu Lv, Huiling Duan
Summary: This paper introduces a generalization of Kresling origami by using free-form quadrilateral unit cells to create diverse conical folded configurations. The conical Kresling origami is modeled with a truss system, allowing for analytical derivation of stable states and energy landscapes. This generalization preserves the bistable nature of Kresling patterns while enabling a wider design space for applications in various fields.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Multidisciplinary Sciences
Xiying Li, Shuang Wang, Lu Lu, Pengyu Lv, Huiling Duan
Summary: In this study, a micromechanical framework is developed to track the effective mechanical properties of phase-change composites throughout the phase transition, and its accuracy and reliability are verified. The proposed model can provide theoretical guidelines for the design of advanced devices with tunable mechanical performance.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Ziyao Ji, Jianzhong Zhao, Honglie Song, Shiwei Xu, Wenbo Pang, Xiaonan Hu, Fan Zhang, Tianqi Jin, Yumeng Shuai, Yu Lan, Di Cheng, Wenwen Man, Renheng Bo, Zhaoguo Xue, Yihui Zhang
Summary: The development of miniaturized three-dimensional (3D) fliers with integrated functional components has implications in engineering areas. The lack of fast-response 3D actuators that can be seamlessly integrated with 3D electronic fliers presents a challenge. The development of morphable 3D mesofliers with shape memory polymer-based electrothermal actuators enables the creation of intelligent 3D mesoflier systems capable of on-demand unfolding.
SCIENCE CHINA-MATERIALS
(2022)
Article
Engineering, Mechanical
Xiangxin Dang, Lu Lu, Huiling Duan, Jianxiang Wang
Summary: This paper systematically investigates the deployment kinematics of axisymmetric Miura origami and provides comprehensive guidance for the design of axisymmetric deployable structures based on origami principles.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Review
Mechanics
Lu Lu, Sophie Leanza, Ruike Renee Zhao
Summary: Origami, with its rotational symmetry, has become a powerful mechanism for designing foldable and deployable structures. Understanding the geometric designs and mechanical behaviors of rotationally symmetric origami is crucial for guiding the rational design of such structures and devices.
APPLIED MECHANICS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Lu Lu, Sophie Leanza, Jize Dai, Xiaohao Sun, Ruike Renee Zhao
Summary: This article introduces strategies for facilitating easy snap-folding of hexagonal rings through geometric modifications. By incorporating residual strain and creating pre-twisted edges, it is possible to achieve easy snap-folding of the hexagonal ring with a simple point load or localized twist or squeeze.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Mechanics
Wenbo Pang, Liya Liu, Shiwei Xu, Yumeng Shuai, Jianzhong Zhao, Yihui Zhang
Summary: Recently developed buckling-guided assembly methods have the potential to design and manufacture 3D mesostructures and microelectronic devices with superior performances and unusual functions. A new electroadhesion-mediated strategy allows for controlled adhesion during the assembly process, enabling the creation of various reconfigurable 3D mesostructures. An electromechanical model captures the delamination behavior of the film/substrate system, and an equivalent interface energy is proposed to quantify the contributions of electroadhesion and van der Waals' interactions.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Mechanics
Jianzhong Zhao, Huijie Cao, Yumeng Shuai
Summary: This study focuses on the vibration characteristics of mechanically assembled 3D serpentine structures. A theoretical model is established and a simple analytical expression for the natural frequency is derived. The influence of material/geometry parameters on the natural frequency is systematically discussed, providing a better understanding of the vibration mechanism in mechanically assembled 3D structures.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Yumeng Shuai, Jianzhong Zhao, Renheng Bo, Yu Lan, Zengyao Lv, Yihui Zhang
Summary: Mechanically-guided three-dimensional assembly is a novel method for fabricating micro/nanoscale 3D structures and devices. It utilizes compressive buckling in a patterned high-modulus thin film integrated with a low-modulus elastomer substrate. To address the challenges of highly flexible 3D mesostructures or those with large-area suspended features, a wrinkling-assisted strategy is proposed to facilitate the delamination at desired regions. This strategy involves introducing an assisting layer with a weaker film/assisting-layer interface and utilizing wrinkles in the assisting layer to induce additional driving forces for separation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Biomedical
Kyeongha Kwon, Jong Uk Kim, Sang Min Won, Jianzhong Zhao, Raudel Avila, Heling Wang, Keum San Chun, Hokyung Jang, Kun Hyuck Lee, Jae-Hwan Kim, Seonggwang Yoo, Youn J. Kang, Joohee Kim, Jaeman Lim, Yoonseok Park, Wei Lu, Tae-il Kim, Anthony Banks, Yonggang Huang, John A. Rogers
Summary: Devices for monitoring blood haemodynamics can guide the perioperative management of patients with cardiovascular disease. In this study, an integrated wireless sensor capable of measuring pressure, flow rate and temperature simultaneously and in real time was developed. The device showed comparable performance to clinical tools in large animal models, providing the potential for continuous monitoring of blood haemodynamics in patients.
NATURE BIOMEDICAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Shunze Cao, Yu Wei, Renheng Bo, Xing Yun, Shiwei Xu, Yanjun Guan, Jianzhong Zhao, Yu Lan, Bin Zhang, Yingjie Xiong, Tianqi Jin, Yuchen Lai, Jiahui Chang, Qing Zhao, Min Wei, Yue Shao, Qi Quan, Yihui Zhang
Summary: This study develops a flexible network scaffold that enhances tissue regeneration by reducing graft-host mechanical mismatch. The scaffold replicates the mechanical properties of soft tissues and provides a suitable microenvironment for cell growth. Experimental results demonstrate superior regenerative performance in treating sciatic nerve defects and Achilles tendon injuries.
Article
Materials Science, Multidisciplinary
Jianzhong Zhao, Weican Li, Xingming Guo, Heling Wang, John A. Rogers, Yonggang Huang
Summary: Vibration-based methods are effective for characterizing physical properties of biological materials, especially the mechanics of living cells. By utilizing mechanics-guided techniques, tunable vibrational structures can be used to simultaneously determine mass and modulus of cells and other biological materials, providing insights for research in biomechanics and dynamic biological processes.
Article
Engineering, Multidisciplinary
Tohya Kanahama, Motohiro Sato
Summary: This study theoretically explains the effect of initial deflection and initial slope on self-buckling characteristics of heavy columns and proposes a formula characterizing the self-buckling problem. The results show that the greatest height is proportional to the 2/3 power of radius, and the formula can potentially predict the height of tree-like natural structures.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Aps Selvadurai, Alexander P. Suvorov
Summary: This paper examines the torsion of a solid cylinder made of a fluid-saturated porous medium with a hyperelastic porous skeleton. It analyzes the mechanics of the twisted cylinder in both short-term and long-term behaviors, using numerical solutions and the ABAQUSTM finite element code.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
S. Kanaun
Summary: This study focuses on spherical radially transverse isotropic heterogeneous inclusions in homogeneous isotropic conductive host media. The volume integral equation for the field in the medium with an isolated inclusion subjected to a constant external field is solved using Mellin-transform technique. The method allows revealing tensor structure of the solution with precision to one scalar function of radial coordinate. The study also investigates the influence of neutral inclusions and conductivity coefficients on the effective conductivity of the composite material.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Marinos Kattis, Vassilis Tsitsos, Vassilis Karatzaferis
Summary: The proposed model utilizes continuum mechanics to describe the mechanical behavior of a weakened interface between materials with microstructure, simulating the weakened interface using a surface elastic medium adhering on either side with bulk elastic continua. The model is able to investigate the effect of a weakened interface on stress concentration around inhomogeneities embedded in an unbounded matrix of Cosserat materials.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Shixiang Zhao, Yu. V. Petrov, Yuyi Zhang, G. A. Volkov, Zejian Xu, Fenglei Huang
Summary: This paper theoretically studies the thermal softening related to stress relaxation using the incubation time approach and examines the temperature-time correspondence. The developed relaxation model of plasticity (RP model) is analyzed and compared with other constitutive models and artificial neural networks. The advantages and disadvantages of different models are discussed, and the differences between the ANN model and other constitutive models are examined.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
Article
Engineering, Multidisciplinary
Ivan I. Argatov, Federico J. Sabina
Summary: This study models a seismic metabarrier as a cluster of single-degree-of-freedom resonator units and considers the scattering effects on pulsed Rayleigh waves caused by the vertical displacements of the resonators and the normal contact forces. The variation of the amplitude reduction factor due to the model parameters variation is studied in detail.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2024)
