Article
Mechanics
M. Zarei, G. H. Rahimi
Summary: This study presents an analytical solution for the buckling analysis of composite sandwich conical shells. By analyzing the forces on a unit cell, the reinforced core is converted to a layer and its stiffness is superimposed with those of the inner and outer shells to achieve the equivalent stiffness of the whole structure. Numerical solutions verify the analytical results and investigate the impact of various design parameters on structural performance.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Engineering, Civil
M. Zarei, G. H. Rahimi, M. Hemmatnezhad
Summary: An analytical approach was used to investigate the global buckling behavior of gridstiffened composite conical shells, showing sensitivity to design parameters and providing novel insights for similar studies.
ENGINEERING STRUCTURES
(2021)
Article
Mechanics
Jangsu Kim, Cholnam Om, Dokgil Kang, Kwonryong Hong, Tong Ho Choe
Summary: This paper investigates the free vibration and dynamic response of laminated composite double cylindrical and conical shells with bulkheads using the meshfree method. The theoretical formulation of each segment is established based on the energy principle in the framework of first order shear deformation theory. The entire system formulation is derived using coupling conditions obtained through the geometrical relations between the segments. Convergence and verification studies confirm the reliability and accuracy of the proposed method, with satisfactory agreements achieved between the numerical results and published literature.
Article
Chemistry, Physical
Mahmure Avey, Nicholas Fantuzzi, Abdullah Sofiyev
Summary: This study presents a solution for the thermal buckling problem of moderately thick laminated conical shells consisting of carbon nanotube (CNT) originating layers. The influences of CNT patterns, number and arrangement of the layers on the uniform buckling temperature are investigated through theoretical derivation and parametric studies.
Article
Mechanics
Peiman Khandar Shahabad, Mirmeysam Rafiei Anamagh, Bekir Bediz
Summary: This study introduces a novel modeling approach to predict the dynamics of laminated conical shells accurately and efficiently, utilizing spectral-Chebyshev approach and lamination parameters for an accurate and computationally efficient solution. The method demonstrates excellent performance in calculating non-dimensional natural frequencies and can be optimized through stacking sequence optimization.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
M. Zarei, G. H. Rahimi
Summary: The present study investigates the buckling analysis of joined composite sandwich conical-cylindrical shells with reinforced lattice core subjected to external pressure. The stiffness parameters of the lattice core are determined using an effective smeared technique and combined with those of the skins. The theoretical formulation is based on first-shear deformation theory and continuity conditions. A highly accurate solution for evaluating the buckling load is provided using power series technique. Finite element analysis is performed to validate the analytical model, and the influence of important design variables on buckling characteristics is investigated.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Shahin Mohammadrezazadeh, Ali Asghar Jafari
Summary: This paper combines multiple scale method and modal analysis to study the nonlinear vibration of laminated composite angle-ply cylindrical and conical shells. The Hamilton principle is used to derive the basic equations of the system, which are further converted to nonlinear ordinary differential equations. Validation and parameter analysis are conducted to illustrate detailed results.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
M. Zarei, G. H. Rahimi, M. Hemmatnezhad
Summary: This paper investigates the vibrational behavior of sandwich conical shells with geodesic lattice core and variable skin thicknesses using analytical and numerical approaches. The equivalent stiffness parameters and natural frequencies are obtained through the smeared stiffener approach and power series method. A 3-D finite element model is provided to validate the analytical results and to discuss the influences of parameters on the vibrational behavior.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Engineering, Marine
Zhun Li, C. Guedes Soares, Guang Pan
Summary: This paper presents buckling solutions for composite laminated cylindrical shells in the underwater environment. Two calculation formulas are proposed to predict the buckling pressure for the underwater composite cylinders with different boundary conditions. The results are validated by comparison with experimental data and consider the influences of geometrical imperfections.
Article
Engineering, Aerospace
Mehdi Zarei, Gholam Hossein Rahimi
Summary: In this paper, an analytical model is developed to investigate the buckling analysis of the composite sandwich conical shell with variable skin thickness under lateral pressure loading. The equivalent stiffness parameters of the sandwich panel are obtained by analyzing forces and moments on a unit cell. The results are verified using a 3D finite element model and can be used to study the effects of important parameters.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
S. W. Yang, Z. Q. Wang, Y. X. Hao, W. Zhang, L. T. Liu, W. S. Ma, G. Kai
Summary: This paper examines the static bending and buckling behavior of the simply supported truncated sandwich conical shell with variable thickness core, considering various styles of porosity distribution schemes for the porous foam core.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Acoustics
Ahmad Reza Ghasemi, Mohammad Meskini
Summary: This research investigates the free vibration analysis of a lap joint laminated conical shell connected to laminated conical shell with adhesive layer. The effects of boundary conditions, composite materials, adhesive layer thickness, shell dimensions, and cone angles on the natural frequency of the structure are studied. The numerical results show good agreement with previous research and indicate that the non-dimensional frequency decreases with increasing internal shell angle and increases with increasing external shell angle.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Civil
Shuangwei Hu, Qinshan Wang, Rui Zhong, Qing Peng, Bin Qin
Summary: This paper presents a dynamic stiffness formulation to analyze the free vibration characteristics of a rotating cross-ply laminated coupled shell. The stability and accuracy of the numerical results are ensured through segmentation analysis and convergence analysis. The effects of rotational speed, geometry, and boundary conditions on the structure are studied.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Shahin Mohammadrezazadeh, Ali Asghar Jafari
Summary: This paper presents the nonlinear vibration control of laminated composite conical shells surrounded by elastic foundations through magnetostrictive layers. Velocity feedback control method is adopted to suppress the nonlinear vibration, and modified Galerkin method is used to obtain the nonlinear ordinary differential equation. The study investigates the asymptotical stability of the system around the zero equilibrium point and provides results for damping coefficients, fundamental linear frequency, and curves of amplitude versus nonlinear frequency and nonlinear frequency ratio for different parameter values.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
M. Zarei, G. H. Rahimi
Summary: The present paper investigates the buckling behavior of sandwich-joined conical-cylindrical shells with geodesic lattice cores using analytical and numerical approaches. The grid structure is transformed to an equivalent composite layer using a smeared stiffener technique. The governing equations are formulated based on the first shear deformation theory, and the power series technique is used to extract the buckling loads. A finite element model is provided to validate the analytical results, showing satisfactory agreement between the two approaches. The results obtained are new and can be used for future studies.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)