Article
Mechanics
Zhenyu Li, Zhiguang Song, Wei Yuan, Xiao He
Summary: This paper investigates two passive ways, i.e. the axially functionally graded (AFG) design and adding torsional springs, to suppress thermal buckling on thin-wall structures of high-speed spacecrafts. The AFG design considers both the thickness and material properties as functions of the axial spatial variable. When torsional springs are added to the main structure, the reduction in structural stiffness caused by temperature change can be offset to the maximum extent under appropriate stiffness coefficients.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Linh T. M. Phi, Tan-Tien Nguyen, Jaehong Lee
Summary: The buckling and lateral buckling of thin-walled functionally graded (FG) open-section beams with various types of material distribution have been studied, taking into account the warping of cross-section and structural coupling from anisotropy of material. The critical load, lateral buckling parameter, and mechanism under different loads and material distributions have been analyzed, showing significant effects on the buckling characteristics.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Civil
Dongying Liu, Da Chen, Jie Yang, Sritawat Kitipornchai
Summary: This paper investigates the buckling and free vibration analyses of axially functionally graded graphene reinforced nanocomposite beams, using different distribution patterns of GPLs and conducting a comprehensive parametric study. The analysis is based on theoretical derivations and model solutions, providing results consistent with existing solutions.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Mechanical
Lieu B. Nguyen, H. Nguyen-Xuan, Chien H. Thai, P. Phung-Van
Summary: This paper presents a size-dependent isogeometric analysis approach for modeling smart functionally graded porous nanoscale plates made of two piezoelectric materials. The nonlocal elasticity theory is employed to consider size-dependent effects and the governing equations are obtained using a combination of higher-order shear deformation theory and non-uniform rational B-splines formulations. The paper investigates the influences of various factors on the natural frequencies of the smart nanoplate and compares the results with published documents, showing the reliability and effectiveness of the proposed method.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Construction & Building Technology
Ali Meksi, Hadj Youzera, Mohamed Sadoun, Ali Abbache, Sid Ahmed Meftah, Abdelouahed Tounsi, Muzamal Hussain
Summary: This article studies the effect of shear deformation on the static post-buckling response of simply supported functionally graded axisymmetric beams. It compares the post-buckling amplitudes and the variation with applied axial load for different theories and material geometry parameters. The results demonstrate the significant contribution of shear effect to the post-buckling behavior.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Seyyed Mohammad Hossein Hosseini, Hadi Arvin, Yaser Kiani
Summary: This article explores the buckling and post-buckling behavior of rotating clamped-clamped functionally graded beams under the influence of thermal environment and rotation, considering the temperature dependency of material properties. The study also investigates the impact of parameters such as rotor radius, beam length to thickness ratio, rotation speed, and power law index on the outcomes.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Materials Science, Multidisciplinary
Kang Gao, Qian Huang, Sritawat Kitipornchai, Jie Yang
Summary: This article examines the nonlinear dynamic buckling of imperfect beams made of functionally graded metal foams subjected to constant velocity under various boundary conditions. Four types of FG porosity patterns are considered, with the governing equations transformed into ordinary differential equations using the Galerkin method and solved using the fourth-order Runge-Kutta method. Validation is done through finite element method (FEM) and a detailed parametric study is conducted.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Fethi Mouaici, Abed Bouadi, Mohamed Bendaida, Kada Draiche, Abdelmoumen Anis Bousahla, Fouad Bourada, Abdelouahed Tounsi, Mofareh Hassan Ghazwani, Ali Alnujaie
Summary: This paper develops an accurate kinematic model to study the mechanical response of functionally graded sandwich beams, covering bending, buckling, and free vibration problems. The model uses a new refined shear deformation beam theory and provides good accuracy, considering a nonlinear transverse shear deformation shape function. The numerical computations using the model are compared with other beam theories to confirm its performance and verify the accuracy of the kinematic model.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Da Chen, Shahed Rezaei, Philipp L. Rosendahl, Bai-Xiang Xu, Jens Schneider
Summary: This paper combines finite element homogenisation and structural assessments to conduct multiscale modelling of laminated functionally graded porous beams made of closed-cell foams. The study focuses on the beam buckling and vibration performances. The results show that the relative density is the dominating factor in calculating the foam modulus, and quantitative relations between pore structure and Young's modulus are obtained. The graded porosities in the FG beams contribute to significant increases in beam stiffness.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Xueqian Fang, Yufei Hu, Changsong Zhu, Shu An, Luqi Chen
Summary: The nonlocal piezoelectric theory and first-order shear deformation theory are combined to study the effect of nanoscale on the free vibration of a laminated functionally graded curved nano-beam covered with piezoelectric layers. The governing equations are derived using Hamilton's principle and solved using the differential quadrature method. Numerical examples show that the natural frequencies of the curved nano-beam are influenced by the beam thickness, volume fraction of fibers, curve parameter, and boundary conditions, which are related to the nonlocal coefficient.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Chengyun Long, Bing Zhao, Jian Chen, Tao Liu, Xulong Peng, Hui Peng, Xinhua Yang
Summary: A new size-dependent thermal buckling model based on modified gradient elasticity is presented in this study. Numerical examples of different supported beams show that the smaller the beam size, the bigger the critical buckling temperature rise, and the internal length scales significantly affect the critical buckling temperature rises. The differences in critical buckling temperature rises caused by choosing different higher-order boundary conditions cannot be ignored.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Civil
Armagan Karamanli, Nuttawit Wattanasakulpong, M. Lezgy-Nazargah, Thuc P. Vo
Summary: The flexural, free vibration, and buckling responses of 2D-FG curved beams with various shear deformation theories are studied using a finite element model. Material properties are varied with power-law distribution in both length and thickness directions. A two-node beam element with C1 continuity requirement is employed for solving the problems. Various problems including isotropic, 1D- and 2D-FG curved beams are analyzed and the results are validated with those available in the literature. Comprehensive parameter examinations are conducted to investigate the effects of gradation indexes, open angles, end conditions, and aspect ratios on the structural behaviors of 2D-FG curved beams.
Article
Engineering, Aerospace
Xuan-Bach Bui, Trung-Kien Nguyen, Armagan Karamanli, Thuc P. Vo
Summary: This paper examines the static and vibration analysis of functionally graded sandwich thin-walled microbeams using the modified couple stress theory. The analysis results show that the deflections and natural frequencies of the microbeams are greatly influenced by the material distribution and size parameters.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Feixiang Tang, Fang Dong, Yuzheng Guo, Shaonan Shi, Jize Jiang, Sheng Liu
Summary: This study investigates the buckling and post-buckling problems of size-dependent functionally graded material thin plates using the framework of the Modified Couple Stress Theory. By considering the power-law distribution with scale effects, the post-buckling deflection and critical buckling load of the plates are derived. It is found that the power-law index parameters have a significant influence on the critical buckling displacement, load, and strain energy, while the scale effect parameter has a greater impact. Additionally, the results show that the scale effects increase material stiffness and that the power-law index parameters affect FGM properties.
Article
Construction & Building Technology
Lenin Babu Mailan Chinnapandi, Jeyaraj Pitchaimani, Mohamed A. Eltaher
Summary: This manuscript presents a comprehensive model to study the vibro-acoustic behavior of functionally graded beams under thermal and mechanical loads, taking into account the effect of porosity. The numerical analysis and parametric studies reveal that the nature of porosity affects the sound radiation behavior.
STEEL AND COMPOSITE 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)
