Article
Engineering, Multidisciplinary
Maryam Lori Dehsaraji, Mohammad Arefi, Abbas Loghman
Summary: This paper employs higher-order shear and normal deformation theory to analyze the free vibration of cylindrical micro/nano shells, taking into account thickness stretching effect and size dependency. Numerical results are used to investigate the impact of geometric parameters, material properties, applied voltages, and temperature rising on the free vibration responses.
DEFENCE TECHNOLOGY
(2021)
Article
Mechanics
Ramazan-Ali Jafari-Talookolaei, Mostafa Attar, Paolo S. Valvo, Farzaneh Lotfinejad-Jalali, Seyedeh Farzaneh Ghasemi Shirsavar, Morteza Saadatmorad
Summary: In this paper, the flapwise and chordwise free vibrations of a rotating laminated composite beam are studied using the finite element method. The results can contribute to a more accurate prediction of the free vibration response of rotating composite beams.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Zanhang He, Jianghong Xue, Sishi Yao, Yongfu Wu, Fei Xia
Summary: A modified first order shear deformation theory is proposed for laminated micro-nano plates with couple stress components involved, based on mechanics of composite materials and Koiter's theory. Governing equations with size-dependent effect are derived and applied to investigate the buckling and free vibration of laminated micro-nano plates. The proposed theory is validated and shown to be efficient and accurate through comparisons with existing models and ABAQUS analysis.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Bo Yin, Jianshi Fang
Summary: A centrifugally stiffened size-dependent model is developed to analyze the dynamic characteristics of rotating functionally graded microplates reinforced with graphene platelets. The study investigates the effects of material and rotation parameters on the system response through complex modal analysis and numerical calculations. The results indicate that rotational motion and size dependency significantly affect the reinforcement effect of graphene platelets.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Yu-fang Zheng, Li-Chuan Liu, De-yong Qu, Chang-ping Chen
Summary: This article presents the nonlinear postbuckling behavior of magneto-electro-thermo-elastic (METE) laminated microbeams. Based on the modified couple stress theory and Reddy's three-order shear deformation theory, along with the von Karman geometric nonlinearity, the nonlinear static model of METE laminated microbeam is established. The nonlinear governing equations and boundary conditions are derived using the principle of virtual work principle. An analytical method is then used to describe the nonlinear postbuckling behavior of METE laminated microbeam with simple supported and clamped boundary conditions. Numerical examples are provided to reveal the effects of various parameters on the critical buckling load and postbuckling response, as well as the distribution of magneto-electric potential through the thickness direction of the microbeam with different lay-up modes.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Multidisciplinary
Sayed Mohamad Mirfatah, Mohammad Amin Shahmohammadi, Hamzeh Salehipour, Omer Civalek
Summary: This work aims to evaluate the dynamic stability of micro-shell panels enriched by nanocomposites using an analytical approach. The modified couple stress theory is utilized to account for the size effects on the mechanical behavior of the micro-shell panels. The fundamental equations, based on the first-order shear deformation theory, are solved using the Galerkin method to obtain a closed-form solution for evaluating the dynamic stability of the proposed micro-shell panels. Comparative studies and a parametric study are conducted to validate the accuracy of the proposed method and investigate the effects of the material length scale parameter on the dynamic stability of the micro-shell panels.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Aerospace
Nguyen Thi Giang, Nguyen Thi Hong
Summary: In this paper, a two-node beam element with nine degrees of freedom (DOFs) was developed to analyze the free vibration and static buckling responses of rotating bidirectional functionally graded porous (BDFGP) microbeams on variable elastic foundations. The mechanical properties and length-scale parameters varied in both thickness and length directions, and the novel porosity model and power-law indexes of the material were considered. The numerical results showed that porosity coefficient, elastic foundation parameters, and hygrothermal environment significantly affected the rotating BDFGP microbeam's mechanical behavior.
JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Engineering, Mechanical
Mehrdad Mohammadnejad
Summary: In this paper, a new Fredholm transformation approach is proposed to analyze the flapwise-bending vibration of nano-beams. The effects of size-dependency are investigated using Eringen non-local elasticity theory, while the rotatory inertia effect on the flapwise vibration of the beam is studied using Rayleigh theory. The novelty of this approach lies in the introduction of a new change of variable, which simplifies and shortens the solution process. The accuracy of the approach is verified through comparison with numerical results available in other published references.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Mechanics
Jianshi Fang, Bo Yin, Xiaopeng Zhang
Summary: A comprehensive model is proposed to analyze the vibration characteristics of porous functionally graded rotating microplates under thermal environment. The study considers temperature-dependent material properties and nonlinear temperature rises. The governing equations of motion are numerically solved using the method of assumed modes. The effects of various parameters on the dimensionless natural frequencies and mode shapes are investigated. The results show the influence of angular velocity, material properties, temperature distribution, and porosity on the microplate's vibration behavior.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Mechanics
Richa Priyanka, Jeyaraj Pitchaimani
Summary: This paper investigates the buckling and free vibration behaviors of micro laminated composite beams under varying axial loads using the modified couple stress theory, capturing the size effect by considering material length scale parameters and exploring different boundary conditions and layups. The observed size effect is more significant when the beam thickness is similar to the material length scale parameter and diminishes as the thickness increases. Different boundary conditions result in varying small size effect variations, with the fundamental frequency decreasing more rapidly under parabolic loading compared to other loading types.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Yuqian Xu, Peijun Wei, Lina Zhao
Summary: The present work investigates the flexural wave propagation in a micro-beam mounted on viscoelastic foundation, considering nonlocal strain gradient elasticity and the effects of size. A parameter study in numerical examples is conducted to explore the influences of nonlocal effects, strain gradient effects, and fractional-order viscoelastic effects on wave propagation.
Article
Engineering, Civil
G. Prateek, De Sarthak, R. Vasudevan, M. Haboussi, M. Ganapathi
Summary: In this study, the nonlinear flexural free vibration characteristics of size dependent curved isotropic nano/microbeams were investigated using the nonlocal elasticity theory and sinusoidal shear deformation theory. The research aims to study the effect of various design parameters on the amplitude-frequency response obtained from the free vibration behavior of curved nano/microbeams, providing useful insights for optimal design of nano/microsystem involving structural elements of the beam type.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Mechanics
Maryam Lori Dehsaraji, Mohammad Arefi, Abbas Loghman
Summary: This paper investigates the buckling analysis of functionally graded piezoelectric nanoshell by considering the higher-order shear and normal deformation theory and thickness stretching effect. The effects of axial load, applied electric potential, and thermal loads are also studied. The results of the analysis provide important insights for the design and application of related materials.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Acoustics
Iman Ghaffari, Ardeshir Karami Mohammadi
Summary: This study analyzes the nonlinear free vibrations of a sandwiched microbeam with a shape memory alloy core and provides a better understanding of the design of such microbeams through comparison with previous studies.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Physics, Multidisciplinary
M. Alimoradzadeh, S. D. Akbas
Summary: This paper investigates the nonlinear dynamic behavior of cracked AFM under external influences, analyzes the effects of various parameters on its stability through numerical examples, and identifies the corresponding unstable regions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani, Mansour Nikkhah-Bahrami, Mohammad Reza Hairi Yazdi
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2017)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani, Mansour Nikkhah-Bahrami, Mohammad Reza Hairi Yazdi
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2017)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2017)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2018)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani, Esmaeil Dehdashti, Mohammad Reza Hairi Yazdi, Mansour Nikkhah-Bahrami
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2019)
Article
Engineering, Mechanical
Amir Mehdi Dehrouyeh-Semnani, Sohrab Jafarpour
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2019)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani, Hasan Mostafaei
Summary: This article provides a thorough investigation into the natural frequencies and mode shapes of thin doubly curved shallow microshells by considering the influence of material length scale parameter. The mathematical model is obtained using Hamilton's principle, modified couple stress theory, and Kirchhoff-Love's shell theory, with the free vibration characteristics extracted using the finite element method. The study includes comparative studies to verify the quadrilateral thin shallow shell element and presents numerical results for various types of shallow microshells with different planforms.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani, Hasan Mostafaei
Summary: A novel mathematical formulation is established for size-dependent thin doubly curved microshells of revolution, and a new microshell element with nine degrees of freedom is developed. The finite element analysis examines the impact of size-dependency on the free vibration characteristics and mode shapes of microshells of revolution, demonstrating accuracy and reliability of the numerical results.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Mechanics
Amir Mehdi Dehrouyeh-Semnani
Summary: Hard magnetic materials are a novel class of soft active materials capable of quick, large, and complex deformation under external actuation, with potential applications in soft robots, biomedical devices, wearable devices, and stretchable electronic devices. Current research focuses on the nonlinear mechanics of hard magnetic soft cantilevers, particularly in terms of bifurcation behavior, parameter identification, new trajectories, corresponding workspace, and comparative analysis.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Amir Mehdi Dehrouyeh-Semnani
Summary: A novel geometrically exact nonlinear beam model is established to investigate the extremely large deformations and stability characteristics of size-dependent microcantilevers under nonconservative loads, using a modified couple stress theory. The mathematical formulation explains the size effect in microcantilevers and numerical methods are utilized to evaluate the deformed configurations and stability. A comprehensive investigation is conducted to highlight the role of size-dependency in flutter instability and large deformation of microsystems.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Amir Mehdi Dehrouyeh-Semnani
Summary: It is questioned whether the actuating magnetic field decreases the oscillation amplitude of a fluid-conveying cantilevered hard magnetic soft pipe in the post-flutter region. The nonlinear responses of the pipe with uniform and nonuniform magnetizations under an actuating parallel magnetic field are examined to answer the question. The role of magnetization in the system's magneto-hydro-elastic responses is analyzed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mechanics
Amir Mehdi Dehrouyeh-Semnani
Summary: In this paper, it is proven mathematically that the stability trend (buckling-post-buckling) of the size-dependent porous functionally graded (metal-ceramic) shear deformable microplates with fully simply supported edges, based on the modified couple stress theory, was incorrectly predicted in the previous study.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
Amir Mehdi Dehrouyeh-Semnani
Summary: The reported results by Fan et al. (2021) indicate that the functionally graded small-scale plate with unsymmetrical material distribution remains flat under compressive load until it reaches a critical buckling load. However, the present comment argues that the small-scale plate undergoes lateral deformation from the beginning of in-plane loading, contrary to the findings of Fan et al. (2021). It is noted that the work of Aydogdu (2008) on unsymmetrically laminated plates was not considered in the study by Fan et al. (2021).
THIN-WALLED STRUCTURES
(2023)
Letter
Mechanics
Amir Mehdi Dehrouyeh-Semnani
COMPOSITE STRUCTURES
(2017)
Article
Mechanics
Amir Mehdi Dehrouyeh-Semnani, Hasan Mostafaei, Mohammad Dehrouyeh, Mansour Nikkhah-Bahrami
COMPOSITE STRUCTURES
(2017)
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)