Article
Engineering, Mechanical
Bahar Uymaz, Gokay Uymaz
Summary: In this study, three-dimensional thermal vibration analysis of functionally graded carbon nanotube (FG-CNT) reinforcement composite plates was conducted, considering four reinforcement models. The material properties of the composite change with temperature, and the effective material properties are determined using mixtures rule. Natural frequencies are obtained using the Ritz method, and the results are in good agreement with other researchers. The increase in temperature and the type of temperature distribution have an effective influence on frequency reduction.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Mechanics
Zhihua Wu, Yimin Zhang, Guo Yao
Summary: This paper investigates the natural frequency and stability of axially moving functionally graded carbon nanotube-reinforced composite (FG-CNTRC) rectangular thin plates. The study derives the equations of motion for the plates and analyzes the variations of natural frequencies with axial moving velocity, as well as the stability of the plates. The effects of various parameters on the natural frequencies and stability are discussed.
Article
Construction & Building Technology
Jing-Lei Zhao, Xu Chen, Gui-Lin She, Yan Jing, Ru-Qing Bai, Jin Yi, Hua-Yan Pu, Jun Luo
Summary: This paper investigates the free vibration characteristics of functionally graded nanocomposite double-beams reinforced by single-walled carbon nanotubes. The distribution pattern of the carbon nanotubes has a significant influence on the reinforcement effect, while the spring stiffness, environment temperature, thickness ratios, and carbon nanotube volume fraction also affect the vibration characteristics.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Abdulmajeed M. Alsubaiea, Ibrahim Alfaqiha, Mohammed A. Al-Osta, Abdelouahed Tounsi, Abdelbaki Chikh, Ismail M. Mudhaffara, Saeed Tahira
Summary: This study uses a simplified higher-order shear deformation beam theory to investigate the vibration response of functionally graded carbon nanotube-reinforced composite beams. Different patterns of reinforcement distribution and uneven porosity distributions are considered. The results show that adding a damping coefficient can improve vibration performance, especially when the spring constant factors are raised. It is also noted that the fundamental frequency of the beam increases as the porosity coefficient increases, indicating the significant impact of porosity on vibrational characteristics.
COMPUTERS AND CONCRETE
(2023)
Article
Engineering, Mechanical
Mitao Song, Lei Zhou, Warna Karunasena, Jie Yang, Sritawat Kitipornchai
Summary: This study investigates the nonlinear dynamic instability of edge-cracked functionally graded graphene nanoplatelet-reinforced composite beams. Micromechanics models are used to estimate the effective material properties, and nonlinear dynamics theory and numerical methods are applied for analysis.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Haiyang Yu, Feng Liu
Summary: This study investigates the snap-through phenomenon in a thermally pre-buckled or post-buckled reinforced composite beam. The governing equations of the beam are obtained using the first order shear deformation beam theory and the von-Karman type of kinematic assumptions. The non-linear equations governing the beam's response to thermal and mechanical loads are solved using the conventional Ritz method with Chebyshev polynomials. The study finds that factors such as temperature change, weight fraction of graphene platelets (GPLs), distribution pattern of GPLs, and boundary conditions significantly influence the limit loads and intensity of the snap-through phenomenon.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Multidisciplinary
Wachirawit Songsuwan, Nuttawit Wattanasakulpong, Sachin Kumar
Summary: The study examined the nonlinear transient response of sandwich beams with functionally graded porous core under the action of moving load. Reddy's third-order shear deformation theory and von K & PRIME;arm & PRIME;an assumption were used to construct the governing equation system, which was solved by the Gram-Schmidt-Ritz method. The results showed that sandwich beams with functionally graded porous distribution outperformed those with uniform porous distribution in terms of strength and stiffness, and the porous coefficient played a crucial role in changing the loading resistance.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Multidisciplinary Sciences
Ying Lv, Jing Zhang, Lianhe Li
Summary: This paper investigates the thermal buckling and postbuckling behavior of composite beams reinforced with functionally graded multilayer graphene platelets (GPLs) resting on nonlinear elastic foundations under axial forces and uniform temperature variations. The impact of various factors on thermomechanical behavior is analyzed using mathematical methods.
Article
Acoustics
Bahman Farahmand-Azar, Ghazaleh Pourmoosavi, Siamak Talatahari
Summary: This article investigates the vibroacoustic properties of double-walled sandwich magneto-electro-elastic plates with a functionally graded carbon nanotube-reinforced composite core layer in a thermal environment. The study comprehensively analyzes the effects of various factors on the transmission loss and provides guidelines for tailoring the dynamic response of these materials for enhanced acoustic insulation performance.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Mechanics
Armagan Karamanli, Metin Aydogdu
Summary: The dynamical analysis of two directional functionally graded carbon nanotube reinforced composite plates shows that the distribution of CNTs significantly affects the dimensionless frequencies. The difference between the dimensionless frequencies calculated based on the 2DFG-CNTRC and 1DFG-CNTRC configurations is significant under different CNT configurations, volume fractions, and aspect ratios.
COMPOSITE STRUCTURES
(2021)
Article
Mathematics, Applied
H. Tung, L. T. N. Trang
Summary: The nonlinear stability of sandwich cylindrical shells composed of porous FGM and CNTRC layers subjected to uniform temperature rise was investigated. It was found that sandwich shell model with a CNTRC core layer and relatively thin porous FGM face sheets has the best capacity of thermal load carrying. Porosities in the FGM were also shown to have beneficial effects on the nonlinear stability under thermal load, suggesting an optimal efficiency for advanced sandwich structures through a combination of the advantages of FGM and CNTRC.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Engineering, Civil
Hamid Reza Balali Dehkordi, Yaghoub Tadi Beni
Summary: This paper investigates the free vibration of a carbon nanotube-reinforced composite Timoshenko microbeam considering the effect of axial load and bending-torsion coupling. The microbeam properties are developed based on the micromechanical model concerning the extended rule of mixtures. The governing equations of motion are derived using the modified couple stress theory and Hamilton's principle. The effects of different parameters on the natural frequency are demonstrated through tables and diagrams, highlighting the significant effect of carbon nanotube volume fraction and the nonconformity between mass and elastic axes.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Mechanics
Buntoeng Srikarun, Wachirawit Songsuwan, Nuttawit Wattanasakulpong
Summary: This study investigates the linear and nonlinear bending behaviors of sandwich beams with functionally graded cores under various distributed loads. The formulation used is based on Reddy's theory and von Karman's nonlinear strain-displacement relations. Numerically stable functions for displacement fields are generated using the Gram-Schmidt orthogonalization procedure, and linear and nonlinear bending results are found using the Ritz method and iterative technique. The accuracy of the solutions is validated, and new results based on different factors like porosity coefficient and loading types are presented for future studies.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Xiaodong Chen, Guojun Nie
Summary: This article investigates the nonlinear post-critical problem of Variable Angle Tow (VAT) sandwich beams with variable stiffness composite skins under axial compression for the first time. A modified version of extended high-order sandwich panel theory is used to construct the sandwich beam model, and a system of differential equations with variable coefficients is formulated based on the principal of virtual work. A Rayleigh-Ritz approach combined with variational formulas and a sophisticated path-tracing technique are employed for analysis. The results demonstrate the significant impact of skin stiffness variation on the critical instability and post-critical behaviors of VAT sandwich beams.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Mechanics
Yanchun Zhai, Xiao Yu, Xiujie Yue, Penghao Wang, Ping Zhang
Summary: This study analyzed the dynamic properties of FG-CNTRC sandwich plates using a combination of the first-order discrete layer model and Navier solution, with detailed parametric studies revealing the change rule of vibration frequencies and loss factors. The numerical results can serve as a reference for engineers designing composite structures with high stiffness and damping.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
H. Bagheri, Y. Kiani, M. R. Eslami
Summary: The geometrically nonlinear thermally induced vibrations of functionally graded material beams resting on an elastic foundation are analyzed in this research. The results show that thermally induced vibrations do exist under certain conditions and are influenced by factors such as beam geometry and material composition.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Engineering, Civil
M. Akbari, M. Sadighi, Y. Kiani, M. R. Eslami
Summary: This paper focuses on the axisymmetric free vibration of functionally graded sandwich annular plates using a quasi-3D plate theory. The motion equations and boundary conditions are established based on this plate theory, which considers the non-uniform shear strains and stretching through the thickness. The generalized differential quadrature method is applied to discretize the governing equations of the annular sandwich plate. The results are verified based on available information in the open literature, and parametric studies are performed to investigate the influences of power law index and dimensions. The applied theory accurately predicts the natural frequencies of FG annular sandwich plates with arbitrary thickness.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Civil
Yingxian Wang, Yaser Kiani
Summary: This research investigates the buckling behavior of a circular graphene-platelet-reinforced composite plate on an elastic foundation for the first time. Equations governing the thermal buckling of the circular plate are derived using Hamilton's principle, classical theory, and the von Karman strain field. The effective material properties are determined using the Halpin-Tsai model and the rule of mixture. The results show the effects of various factors on the critical thermal buckling temperature.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Civil
H. Bagheri, M. R. Eslami, Y. Kiani
Summary: The current research focuses on analyzing the geometrical non-linear thermally induced vibrations of functionally graded material (FGM) joined conical-conical shells. The thermo-mechanical properties of the shell are assumed to be temperature and position dependent. The study investigates the effects of conical geometry, material composition, temperature dependence, mechanical properties, shell system configuration, and thermal boundary conditions.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
H. Bagheri, Y. Kiani, M. R. Eslami
Summary: This study investigates the dynamic response of hermetic capsule construction made of functionally graded materials under thermal shock. Material properties are derived using the Voigt and Toloukian models, taking into account the dependence on position and temperature. A one-dimensional transient heat transfer equation is established and solved using the Crank-Nicholson approximation and Picard's iterative method with the GDQ numerical method. The resulting temperature distribution is then used to determine the thermal force and moment. The equations of motion are derived using the first-order shear theory and the von Karman form of geometric non-linearity, and solved using the Newton-Raphson iterative approach and the ss-Newmark time estimate approach.
Article
Mechanics
H. Bagheri, Y. Kiani, M. R. Eslami
Summary: This research investigates the geometrically non-linear thermally induced vibrations of functionally graded material (FGM) joined spherical-conical shells. The thermo-mechanical properties of the shells are assumed to be temperature and position dependent. The analysis includes solving the one-dimensional transient heat conduction equation and solving non-linear coupled equations of motion using the iterative Picard method and the beta-Newmark time approximation technique.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Civil
A. Keibolahi, Y. Kiani, M. R. Eslami
Summary: This article analyzes the nonlinear thermally induced vibrations of temperature-dependent functionally graded material (FGM) deep spherical shells. The one-dimensional heat conduction equation across the shell thickness is solved to obtain the temperature profile, which is used to calculate the thermal forces and thermally induced bending moment in the shell's equations of motion. The axisymmetric equations of motion are derived based on the assumptions of first-order shear deformation theory (FSDT), uncoupled thermoelasticity laws, von Karman nonlinearity, and the Hamilton principle. The governing nonlinear equations of motion are discretized using the conventional multi-term polynomial Ritz method and solved with the fl-Newmark time marching scheme and the Newton-Raphson linearization method. The effects of parameters such as the shell's opening angle, thickness, and material composition rule power law index are analyzed through numerical results.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Civil
Liwei Xin, Yaser Kiani
Summary: This research performs an analysis to determine the natural frequencies and mode shapes of a thick sandwich beam with metal foam core. Different types of foams with functionally graded patterns of pore distribution are considered. The governing equations of the sandwich beam are established using a shear and normal deformable thick beam model that accounts for thickness stretching and nonuniform through-the-thickness shear strain. The established equations are then solved for thick sandwich beams resting on elastic foundation using the Navier solution method. The results of this study are compared with existing data and new insights are provided on the effects of various parameters on the vibration characteristics of the sandwich beam. It is demonstrated that the porosity of the core is an important factor influencing the vibration characteristics of the sandwich beam with metal foam core.
Article
Mechanics
Mehdi Karimipour Dehkordi, Yaser Kiani
Summary: The current investigation focuses on the response of a hollow cylinder within the framework of generalized magneto-thermoelasticity. The results show the propagation and reflection of thermal, electrical, mechanical and magnetic waves. It is verified that temperature propagates with a finite speed.
Article
Mechanics
Liwei Xin, Yaser Kiani
Summary: This study analyzes the generalized coupled thermoelastic wave propagation and temporal evolution in a bi-layered system. The main layer is made of functionally graded materials (FGM), while the holder layer is viscoelastic. The constituent volume fractions in the FGM layer are calculated using a power law function. The study employs the Voigt rule of mixtures and the Kelvin-Voigt model for material properties and constitutive law, respectively. The Chebyshev collocation element (CCE) method is used for spatial-dependent equations and the Newmark numerical integration method is implemented for calculating the system response. The obtained results are verified with limited literature articles and parametric results are shown to evaluate the influence of FG and viscoelastic characteristics on the FGM layer response under a thermal shock.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Suxia Hou, Minghai Li, Jijun Luo, Yaser Kiani
Summary: This study contributes to the modeling and analysis of damping and vibration in the innovative composite sector with glass fiber-reinforced magnetorheological elastomer (MRE) plates. The study uses polar orthotropic laminas and generalized Maxwell constitutive law to describe the tunable viscoelastic properties of the MRE elastomer. The effects of a magnetic field on the storage and loss moduli, as well as the influence of composite and geometric properties on natural frequencies and modal loss factors, are investigated.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Mechanical
H. Bagheri, Y. Kiani, M. R. Eslami
Summary: This study investigates the geometrically nonlinear dynamic response of a functionally graded material conical-cylindrical-conical joint shell construction exposed to rapid surface heating. The material properties are determined using the Voigt and Touloukian models, and the equations of motion are derived using the first-order shear deformation theory and the von Karman form of nonlinear kinematics. The study finds that the geometrical characteristics and boundary conditions of the shell are important factors influencing the dynamic response of the shell system under rapid surface heating.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Civil
A. Haghani, R. Ghaderi, Y. Kiani
Summary: Currently, Atomic Force Microscope (AFM) is widely used for nanoscale measurements and manipulation. This study investigates the possibility of utilizing graphene-nanoplatelet-reinforced composite (GPLRC) in AFM microcantilever (MC). The nonlinear vibrational behavior of GPLRC MC and its interaction with the sample surface are compared with that of the silicon MC. The results show that GPLRC MC is more sensitive to the nonlinearity of the interaction force.
Article
Mathematics
Yunhe Zou, Yaser Kiani
Summary: This research analyzes the natural frequencies of a graphene-platelet-reinforced composite plate at nanoscale using the nonlocal elasticity theory. The results show that the natural frequencies of the plate can be enhanced by introducing an appropriate amount and distribution pattern of graphene-platelet-reinforced material.
Article
Engineering, Civil
Zuocai Dai, Yaser Kiani
Summary: In this study, a novel analysis approach for lattice composite cylindrical shells reinforced with Graphene Platelets (GPL) nanoparticles is presented. The investigation focuses on the advanced structures, incorporating nanocomposite reinforcement, orthotropic inhomogeneity, and semi-analytical methods. The study provides insights into the stability response of these innovative structures by incorporating theoretical formulations and stability analysis.
ENGINEERING STRUCTURES
(2023)
