Article
Mechanics
Mohammad Arefi, Marco Amabili
Summary: This paper investigates the three-dimensional magneto-electro-elastic bending and buckling analyses of three-layered doubly curved nanoshells based on nonlocal elasticity theory. The kinematic relations and governing equations are developed, and a parametric analysis is performed to examine the influence of various factors on the responses of the nanoshells.
COMPOSITE STRUCTURES
(2021)
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
Engineering, Multidisciplinary
Yiwen Ni, Jiabin Sun, Junlin Zhang, Zhenzhen Tong, Zhenhuan Zhou, Xinsheng Xu
Summary: An accurate buckling model is proposed for the MEE composite cylindrical shell under HTMEE loads, considering non-uniform pre-buckling effects. Nonlinear governing equations involving HTMEE multi-physical coupling effects are derived based on HSDT and von Karman geometrical nonlinearity. The critical buckling stresses and analytical buckling modes for both axisymmetric and non-axisymmetric buckling are obtained through the Galerkin method.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Mechanics
Reza Asrari, Farzad Ebrahimi, Mohammad Mahdi Kheirikhah, Keivan Hosseini Safari
Summary: This article investigates the buckling characteristics of a functionally graded magneto-electro-thermo-elastic nanoshell based on the nonlocal strain gradient theory. The nanoshell is subjected to external fields, and the governing equations are derived and solved using Galerkin's approach, exploring the dependence of buckling behavior on various factors.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Construction & Building Technology
Yu Song, Jiangyang Xu
Summary: The research analyzes the nonlinear stability behaviors of composite MEE nano-scale shells, finding that the stability behaviors depend on the percentages of the ingradients. The study also investigates the effects of nonlocality parameter, magnetic intensities, and electrical voltages on stability loads of the nanoshells.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Computer Science, Interdisciplinary Applications
Tarek Merzouki, Mohammed Sid Ahmed Houari, Mohamed Haboussi, Aicha Bessaim, Manickam Ganapathi
Summary: In this study, a new trigonometric two-variable shear deformation beam nonlocal strain gradient theory is proposed. The combined effects of nonlocal stress and strain gradient on the bending, buckling, and free vibration analysis of nanobeams are investigated. The proposed model shows good predictive capability and accuracy within the nonlocal context, as demonstrated through numerical examples and comparisons with other higher-order shear deformation beam theories.
ENGINEERING WITH COMPUTERS
(2022)
Article
Chemistry, Multidisciplinary
Giovanni Tocci Monaco, Nicholas Fantuzzi, Francesco Fabbrocino, Raimondo Luciano
Summary: This work presents an analytical method for studying the vibrations and buckling behavior of nano-plates in a hygro-thermal environment. Nonlinear von Karman terms and strain gradient nonlocal theory are included in the analysis to consider the effects of nano-scale on magneto-electro-elastic plates, along with critical temperatures for vibrations and buckling problems under hygro-thermal loads.
Article
Chemistry, Multidisciplinary
Ahmed Amine Daikh, Mohammed Sid Ahmed Houari, Behrouz Karami, Mohamed A. Eltaher, Rossana Dimitri, Francesco Tornabene
Summary: This paper presents a mathematical continuum model to investigate the static stability buckling of cross-ply single-walled carbon nanotube reinforced composite curved sandwich nanobeams in thermal environment. The study considers nonlocal strain gradient theory, temperature-dependent material properties, and various reinforcement material distributions. A numerical study is performed to validate the proposed model and check for the effects of several factors on the buckling response of CNTRC curved sandwich nanobeams.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Interdisciplinary Applications
Farzad Ebrahimi, Mahsa Karimiasl, Abhinav Singhal
Summary: This article investigates the bending of magneto-electric-elastic nanobeams using nonlocal elasticity theory and parametric analysis. The study shows that boundary conditions, nonlocal parameters, and beam geometrical parameters significantly affect the deflection of nanoscale beams.
ENGINEERING WITH COMPUTERS
(2021)
Article
Mechanics
Shengbo Zhu, Jiabin Sun, Zhenzhen Tong, Qingdong Li, Zhenhuan Zhou, Xinsheng Xu
Summary: This paper investigates the post-buckling analysis of MEE composite cylindrical shells subjected to multi-field coupled loadings, establishing nonlinear large deflection governing equations and obtaining post-buckling equilibrium paths through Galerkin's method with good accuracy and agreement. The effects of geometrical parameters, material properties, and multi-field coupled loadings on post-buckling behaviors of MEE composite cylindrical shells are discussed in detail.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Liming Zhou, Fangting Qu
Summary: Many engineering problems involve the coupling or interaction between different physics fields. In order to improve the efficiency and accuracy of calculations for magneto-electro-elastic materials in multiphysics fields, the MEE coupling isogeometric analysis method (MIGAM) is proposed. This method uses non-uniform rational B-spine (NURBS) functions for both geometric and analytical models, achieving seamless integration and ignoring mesh density effects. The MEE models, constructed using NURBS functions, are used to investigate the multiphysics coupling effects and static/dynamic responses under thermal and mechanical loading. Compared to the finite element method, MIGAM achieves higher efficiency by using fewer control points while maintaining sufficient accuracy for coupling multiphysics problems.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Mustafa Eroglu, Ismail Esen, Mehmet Akif Koc
Summary: This paper models and analyzes the free vibration and temperature-dependent buckling behavior of porous functionally graded magneto-electro-thermo-elastic material. A high-order sinusoidal shear deformation theory is used to accurately model the anisotropic material behavior, taking into account various factors that affect the material's performance.
Article
Computer Science, Interdisciplinary Applications
Mahsa Najafi, Isa Ahmadi
Summary: In this paper, an efficient method based on nonlocal elasticity theory and Layerwise theory is proposed for the analysis of bending, buckling, and vibration of functionally graded nanobeam. The method takes into account the transverse shear and normal strains of nanobeam and the small-scale effect. The proposed theory is validated by comparing with other theories and shows accurate results in predicting vibration, buckling, and bending of nanobeams.
ENGINEERING WITH COMPUTERS
(2023)
Article
Physics, Multidisciplinary
Shunzu Zhang, Yuanwen Gao
Summary: This study establishes a theoretical model for magneto-elastic PC nanobeams, and analyzes the influence of nonlocal effects, pre-stress, and magnetic field on the band structure. The results show that the nonlocal effect and geometric parameters play key roles in determining the high order band gaps.
Article
Engineering, Civil
Vu Dinh Quang, Tran Quoc Quan, Phuong Tran
Summary: This paper presents the nonlinear static buckling analysis of a magneto-electro-elastic sandwich plate on a Pasternak-type elastic foundation subjected to various loadings. The study explores the combination of an auxetic honeycomb core with negative Poisson's ratio and magneto-electro-elastic face sheets. By utilizing Reddy's theory, Galerkin method, and Bees algorithm, the stability characteristics and influencing factors of the sandwich plate were investigated.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Farzad Ebrahimi, Sepehr Bayrami Sedighi
Summary: In this paper, a sandwich composite plate with a tunable magneto-rheological (MR) fluid core was used to analyze wave propagation. The effects of magnetic field and core-to-top layer thickness ratio on the wave dispersion characteristics were investigated. The results showed that the magnetic field intensity was the most important factor in changing the wave dispersion characteristics, and increasing the core-to-top layer thickness ratio led to a decrease in wave frequency.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Reza Asrari, Farzad Ebrahimi, Mohammad Mahdi Kheirikhah, Keivan Hosseini Safari
Summary: This article investigates the buckling characteristics of a functionally graded magneto-electro-thermo-elastic nanoshell based on the nonlocal strain gradient theory. The nanoshell is subjected to external fields, and the governing equations are derived and solved using Galerkin's approach, exploring the dependence of buckling behavior on various factors.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Ali Shokrgozar, Aria Ghabussi, Farzad Ebrahimi, Mostafa Habibi, Hamed Safarpour
Summary: In this study, the stability of a cylindrical microshell reinforced by graphene nanoplatelets under axial load is investigated, taking into account the viscoelastic foundation and nonlocal strain gradient theory. The research considers the effects of various boundary conditions and explores the impact of viscoelasticity, strain-stress size-dependent parameters, and other factors on the stability of the microshell. The results provide valuable insights for the design and fabrication of microactuators and microsensors.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Computer Science, Interdisciplinary Applications
Ali Dabbagh, Abbas Rastgoo, Farzad Ebrahimi
Summary: This paper analyzes the post-buckling behaviors of multi-scale hybrid nanocomposite beam-type structures manufactured from carbon fibers and carbon nanotubes, considering the influences of agglomeration phenomenon and initial deflection. Nonlinear governing equations are derived based on the combination of the virtual work's principle, von Karman hypothesis, and Euler-Bernoulli beam theory, solved analytically using Galerkin's method under different boundary conditions to show the significant impact of tailoring agglomeration parameters on stability response.
ENGINEERING WITH COMPUTERS
(2022)
Article
Mechanics
Ali Shariati, Farzad Ebrahimi, S. Hamed S. Hosseini, Ali Toghroli, S. Sedighi Bayrami
Summary: This article investigates the effect of nanoflow on the nonlinear dynamic instability of graphene sheets under parametric excitation. By combining nonlocal elasticity and nonlinear von Karman theories, the governing equation of motion is derived, and a nonlinear Mathieu-Hill equation is established to determine the bifurcations and regions of dynamic instability. The main conclusion is that nanoflow directly influences the amplitude response of the system. This study provides valuable information for future research in the field of nano electromechanical systems.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Seyed Sajad Mirjavadi, Masoud Forsat, Mohammad Reza Barati, A. M. S. Hamouda
Summary: This study investigates the nonlinear free vibrations of porous functionally graded annular spherical shell segments and highlights the factors affecting the vibration characteristics.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Computer Science, Interdisciplinary Applications
Saeedeh Qaderi, Farzad Ebrahimi
Summary: In this paper, the vibration behavior of a composite plate reinforced with graphene platelets on a viscoelastic foundation in a thermal environment is examined using a higher-order shear deformation theory. The material properties of the composite plate reinforced with graphene platelets are determined using the Halpin-Tsai model. The Euler-Lagrange equations of the composite plate are obtained using Hamilton's principle and Navier's method is used to analyze and solve the problem. The effects of various parameters on the vibrational reaction of the structure, such as geometry, graphene platelet weight fraction, temperature changes, and viscoelastic foundation, are analyzed.
ENGINEERING WITH COMPUTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Farzad Ebrahimi, Ali Seyfi
Summary: This investigation analyzes the wave propagation of porous metal foam cylindrical shells and presents the variations of wave frequency and phase velocity under different parameters.
ENGINEERING WITH COMPUTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Ali Shariati, Saeedeh Qaderi, Farzad Ebrahimi, Ali Toghroli
Summary: In this study, the buckling analysis of polymer composite plates reinforced with graphene platelets (GPLs) in a thermal environment is investigated using the higher-order shear deformation plate theory. The material properties of the multilayer polymer composite plate are determined using the Halpin-Tsai model. Four different patterns of GPL distribution in the composite plate are considered. The Euler-Lagrange equations of the composite plate are obtained using Hamilton's principle and Navier's method is used to analyze and solve the problem. The results of this study are verified by comparison with previous works, and the effects of various parameters such as geometry, GPL weight fraction, and temperature changes on the critical buckling temperature are explored.
ENGINEERING WITH COMPUTERS
(2022)
Article
Mechanics
Ali Shariati, S. Sedighi Bayrami, Farzad Ebrahimi, Ali Toghroli
Summary: This article investigates the wave propagation of a sandwich composite beam with a tunable electro-rheological (ER) fluid core. The governing equations of motion are derived using Hamilton's principle, and an analytical solution is utilized to obtain the wave frequency and phase velocity through solving an eigenvalue problem. Additionally, the effects of different parameters, such as electric field, core-to-top layer thickness ratio, and ER core thickness, on the wave dispersion characteristics are investigated.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Mechanics
Seyed Sajad Mirjavadi, Masoud Forsat, Mohammad Reza Barati, A. M. S. Hamouda
Summary: This article investigates the nonlinear vibration of variable thickness cylindrical panels made of multi-scale composite materials. The study defines the elastic properties of the materials and considers the changes in panel thickness. By using Jacobi elliptic functions to solve the governing equations, the exact frequency-amplitude curves of the panels are obtained. The study also examines the effects of various factors on the frequency-amplitude curves.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Physics, Multidisciplinary
Farzad Ebrahimi, Mostafa Nouraei, Ali Seyfi
Summary: An analytical approach was developed to investigate wave propagation in GOP reinforced nanocomposite plates under thermal loading. The study derived governing differential equations and solved them analytically to obtain wave frequency and phase velocity. The influences of various parameters on wave propagation behavior were also covered.
WAVES IN RANDOM AND COMPLEX MEDIA
(2022)
Article
Mechanics
Farzad Ebrahimi, Ali Dabbagh, Abbas Rastgoo
Summary: This paper investigates the buckling problem of a multi-scale hybrid nanocomposite shell for the first time while the cylinder is supposed to be rested on an elastic substrate. The effects of nanofillers' agglomeration and the equivalent material properties of the carbon nanotube-reinforced (CNTR) nanocomposite are studied. The results provide insights into the failure behavior and propose strategies to enhance the buckling resistance of the nanocomposite structure.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Computer Science, Interdisciplinary Applications
M. S. H. Al-Furjan, Seyedeh Yasaman Bolandi, Mostafa Habibi, Farzad Ebrahimi, Guojin Chen, Hamed Safarpour
Summary: This study presents critical angular velocity, critical velocity of fluid flow, and vibration control analysis of a rotating multi-hybrid nanocomposite reinforced cylindrical microshell. By utilizing a non-classical model, various factors such as Coriolis and centrifugal effects, strains and stresses, and external voltage are considered. The study also applies the rule of mixtures and a modified Halpin-Tsai theory for elasticity modulus, and utilizes a Proportional-Derivative (PD) controller for sensor output control.
ENGINEERING WITH COMPUTERS
(2022)
Article
Mechanics
Mohammad Reza Barati, Hossein Shahverdi
Summary: In this article, the nonlinear free/forced vibrations of a plate undergoing large deflection and moderate rotation were investigated using Jacobi elliptic functions. The results showed that the conventional approximate solutions based on single-harmonic assumption were inadequate, while the Jacobi elliptic function method considered higher-order harmonics and provided a more accurate solution.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)