Article
Mechanics
Ciaran McHale, Sean Carey, Demetra A. Hadjiloizi, Paul M. Weaver
Summary: The morphing cylindrical lattice is a new type of structure that can meet the lightweight and compact storage requirements of deployable spacecraft technology, while also being rigid and expansive once deployed. This structure, made of narrow strips of carbon fiber composite material, is particularly suitable for deployable booms, solar arrays, and antennae. The model developed in this work includes thermal stress effects, allowing for the design of thermally actuating lattices, and has been verified through comparison with finite element analysis and experimental data with excellent agreement.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Ciarn McHale, Paul M. Weaver
Summary: This study aims to develop a method to increase the bending stiffness of lattice structures while minimizing the increase in mass and stowed volume. This is achieved by using additional composite strips mounted adjacent and concentric to pre-existing strips. The new lattice configuration has a lighter weight and smaller stowed height compared to conventional configurations, but may have reduced stiffness. By increasing the deployed bending stiffness, this work enhances the feasibility of the morphing cylindrical lattice for deployable space structures.
MATERIALS & DESIGN
(2022)
Article
Mechanics
Emad Sobhani, Amir R. Masoodi, Amir Reza Ahmadi-Pari
Summary: In this paper, free vibration analysis of sandwich composite joined conical-cylindrical-conical shells is conducted using FSDT, reinforced with FG-CNTs and FG-GNPs. Different distribution patterns and boundary conditions are considered, with the GDQM method utilized to solve the PDE system. The correctness and efficiency of the proposed formulation are validated through comparison with reference solutions.
COMPOSITE STRUCTURES
(2021)
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 study investigates the vibrational characteristics of joined stiffened conical-cylindrical composite shells using experimental, numerical, and analytical techniques. By superimposing the stiffness contribution of the shells and helical stiffeners, total stiffness coefficients are calculated for the entire structure. The derived governing equations are solved using a power series technique, and natural frequencies and mode shapes are obtained through an eigenvalue problem, with good agreement found between analytical, numerical, and experimental results. Effects of design parameters on modal parameters are thoroughly explored.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Zhen Li, Qingshan Wang, Rui Zhong, Bin Qin, Wen Shao
Summary: This paper investigates the vibro-acoustic responses of cross-ply laminated composite shells, including cylindrical and conical shells, subjected to acoustic medium using the meshfree method. The theoretical formulations of the structural and acoustic models are deduced based on the energy principle, first-order shear deformation theory (FSDT), and the Kirchhoff-Helmholtz integral equation. The displacement and acoustic pressure are described using meshfree shape functions and Fourier series. The presented method's reliability and accuracy are verified by comparing with published articles, and parametric analysis is performed to study the influences of various factors on the acoustic responses of shells.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Acoustics
Mohammad Meskini, Ahmad Reza Ghasemi
Summary: This study investigates the free vibration analysis of laminated composite shells with adhesive joints, considering various boundary conditions. Numerical analysis is conducted based on the first order shear deformation shell theory and compatibility conditions. The effects of geometrical parameters, material properties, and adhesive layer thickness on the natural frequency of the structure are studied. The results show that these factors have an influence on the frequency response of the structure.
JOURNAL OF VIBRATION AND CONTROL
(2023)
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
Engineering, Civil
B. Uspensky, K. Avramov, N. Sakhno, O. Nikonov
Summary: In this paper, the dynamic instability of functionally graded carbon nanotubes-reinforced composite joined conical-cylindrical shell in supersonic flow is numerically analyzed. By applying the higher-order shear deformation theory, the stress-strain state of the thin-walled structure is described. The assumed-mode method is utilized to derive the dynamical system, and the eigenmodes are obtained by the Rayleigh-Ritz method. The numerical analysis reveals that the dynamic instability arises from the Hopf bifurcation, and the critical pressure of the supersonic flow depends on the Mach number and the type of CNTs distribution.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Nanoscience & Nanotechnology
Xiangling Wang, Xiaofeng Guo, Masoud Babaei, Rasoul Fili, Hossein Farahani
Summary: This paper presents the natural frequency behavior of a graphene platelets reinforced composite (GPL-RC) joined truncated conical-cylindrical-conical shell resting on a Winkler-type elastic foundation for the first time. The mechanical properties of the structure are obtained using the rule of mixture and the modified Halpin-Tsai approach. Four different graphene platelets patterns are considered and a finite element procedure is used to solve the elasticity equations. The effects of various geometric variables, boundary conditions, stiffness of the elastic foundation, dispersion pattern, and weight fraction of GPLs nanofillers on the natural frequencies of the joined shell are investigated.
ADVANCES IN NANO RESEARCH
(2023)
Article
Engineering, Civil
Peng Zuo, Xianjie Shi, Zhou Huang, Jingrun Luo, Renwei Ge
Summary: This study presents a new semi-analytical random dynamic model to accurately predict and quickly analyze the frequency-domain random response of composite laminated conical-cylindrical cabin structures (CL-CCCSs) under stationary random loads. The model incorporates thermal load and uses the first-order shear deformation theory (FSDT) combined with the spectro-geometric method (SGM) and pseudo-excitation method (PEM). The results of numerical analysis validate the reliability of the model, and the study explains the influence of parameters such as lamination scheme, layer number, and temperature on the random vibration response of CL-CCCSs.
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
Engineering, Civil
Peng Zuo, Xianjie Shi, Renwei Ge, Jingrun Luo
Summary: A unified solution method is established for analyzing the free, steady-state, and transient vibration of composite laminated joined conical-cylindrical shells under thermal environment. The use of artificial spring technology helps handle the boundary and continuity conditions, and the proposed approach is shown to be efficient through comparison with the finite element method solution.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Chenguang Wang, Xuyuan Song, Jian Zang, Yewei Zhang
Summary: This study investigates the vibration of composite conical-cylindrical-combining shells (CCCCSs) under elastic supports and hygrothermal effects through experimental and theoretical investigations. The kinetic, potential, and hygrothermal potential energies are derived using the Donnell shell hypothesis. Elastic springs are introduced to simulate elastic supports and the interface between the two shells. Dynamic equations for laminated CCCCSs with elastic supports in a hygrothermal environment are obtained using the Rayleigh-Ritz method and modified orthogonal polynomials as displacement functions. Experimental and finite element simulations are conducted to validate the proposed analytical strategy. The vibration characteristics of CCCCSs are discussed extensively in relation to temperature, humidity, interfacial bonded stiffness, and elastic boundary conditions. The study finds that the coupling phenomenon becomes more prominent with increasing interface joint stiffness, and the thermal load has a significant effect on CCCCS vibration within a specific temperature range determined by material mechanics and manufacturing scheme.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Dongze He, Dongyan Shi, Qingshan Wang, Chunlong Ma
Summary: In this article, the power series method is used to investigate the free vibration characteristics of composite laminated structures with arbitrary boundary conditions. The method establishes the governing equations, transforms variables, and searches for natural frequencies accurately. The discussion also covers the impact of geometric parameters and material constants on the vibration characteristics.
