Article
Engineering, Civil
Farzad Ebrahimi, Mahdi Dadashi
Summary: This paper investigates the vibration analysis of a composite cylindrical shell with a core with negative Poisson's ratios and an elastic foundation, subjected to pre-loaded axial compression and external excitation force. The dynamic analysis of the shell is conducted using mathematical methods based on Donnell's improved shell theory, ignoring the shallowness of cylindrical shells. Both the linear and nonlinear aspects of the structure's vibration are discussed. Several parametric examples are presented to show the effects of different parameters on the oscillation of the three-layer cylindrical shell, and the proposed method is compared with other literature attempts to ensure the accuracy and precision of the numerical results.
Article
Mechanics
Sumeet Chakraborty, Tanish Dey
Summary: This study investigates the nonlinear stability characteristics of simply supported carbon nanotubes reinforced composite cylindrical shell panel under combined axial compressive loading and localized heating using a semi-analytical approach. The thermomechanical properties of the panel are considered temperature-dependent and modeled using higher order shear deformation theory and von Karman type nonlinearity. The influence of various dispersion profiles of CNTs, CNT volume fraction, and heating profiles on the buckling and post-buckling characteristics of the panel subjected to thermomechanical loadings is demonstrated through obtained results.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Ehsan Taati, Famida Fallah, Mohamad Taghi Ahmadian
Summary: The free vibration behavior of rotating thin cylindrical shells with variable thickness was analyzed based on classical shell theories. The study showed that the influence of thickness variation on natural frequencies and mode shapes is significant, especially for high rotation speeds and cantilever long shells. Differences in results predicted by Donnell's and Love's theories become more pronounced for long and cantilever shells in specific vibration mode shapes.
THIN-WALLED STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Fei Yin, Xudong Zhi, Feng Fan, Wuchen Wei, Dianshuang Zheng
Summary: In this paper, the anti-blast design of cylindrical shells is studied. Cylindrical charges in five directions were exploded to measure the blast loads and capture blast waves. The analysis of the test and simulation results reveals significant differences in peak overpressure of the blast waves between different orientations and an abrupt change in the blast loads at a specific angle. The findings provide a reference for establishing a blast load database of typical buildings.
SCIENTIFIC REPORTS
(2023)
Article
Mathematics, Interdisciplinary Applications
J. Zhang, W. Zhang, Y. F. Zhang
Summary: This paper investigates the resonant responses of a hyperelastic cylindrical shell with initial geometric imperfections by considering both geometric and material nonlinearities. The governing equations of motion are derived using Donnell's theory, hyperelastic constitutive relations, and Lagrange equation. Perturbation analysis is conducted under the 2:1 internal resonance condition using the multiple scale method. The numerical results show that the presence of geometric imperfections increases the linear frequencies of the hyperelastic cylindrical shell and the amplitude-frequency response curves exhibit double-jumping phenomena. The imperfection amplitudes, imperfection forms, and structure parameters significantly influence the resonant peak evolutions and the vibrations can transition from periodic to chaotic with changes in parameters.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Engineering, Mechanical
F. Zheng, W. Zhang, X. G. Yuan, Y. F. Zhang
Summary: This paper investigates the radial nonlinear vibrations of a thin-walled hyperelastic cylindrical shell made of the classical incompressible Mooney-Rivlin materials under radial harmonic excitation. The nonlinear differential governing equation of motion is derived using Lagrange equation, Donnell's nonlinear shallow-shell theory, and small strain assumption. The equation is simplified to a generalized Duffing equation with a quadratic term. Second-order approximate analytical solutions are obtained using the modified Lindstedt-Poincare (MLP) method. The effects of parameters on amplitude-frequency response curves and equilibrium points are analyzed. Bifurcation diagrams, Lyapunov exponents, and Poincare maps are obtained using the Runge-Kutta method. Chaotic behaviors are observed in the radial nonlinear vibrations of the shell. The results indicate that the nonlinear dynamic responses of the shell are highly sensitive to structural parameters and external excitation.
NONLINEAR DYNAMICS
(2023)
Article
Mathematics, Applied
Youheng Dong, Haiyan Hu, Lifeng Wang, Xiaochen Mao
Summary: This paper investigates the nonlinear coupled multi-mode vibrations of thin-walled and moderately thick cylindrical shells based on nonlinear shell theory and shear deformation theory. Iteration procedure is used to solve the high-dimensional differential equations with quadratic and cubic nonlinearities, and the influence of irregular modes on coupled multi-mode vibrations is analyzed.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2024)
Article
Acoustics
Shohreh Reaei, Roohollah Talebitooti
Summary: This study focuses on deriving an analytical solution for calculating sound transmission loss through a double-walled circular cylindrical shell with two isotropic skins and a polymeric foam core. The equations of motion are derived using the first-order shear deformation theory and the Zener mathematical model is employed to determine the mechanical properties of the core. The results show that the presented model has high accuracy and decreasing the power-law exponent of the core improves the sound transmission loss.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Civil
Pascal Ventura, Hamza Azzayani, Hamid Zahrouni, Michel Potier-Ferry
Summary: In this paper, the buckling of elastic thin structures, specifically cylindrical shells under external pressure, is numerically analyzed using the Asymptotic Numerical Method (ANM) and Pade approximants. The perturbation technique is applied to both conservative and non-conservative loadings. The study utilizes a shell formulation suitable for thin structures, incorporating the Enhanced Assumed Strain (EAS) concept and a three-dimensional constitutive law without condensation. Numerical examples are presented, comparing critical pressure for conservative and non-conservative loading.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Aerospace
Yunfei Liu, Wenyang Hu, Runze Zhu, Babak Safaei, Zhaoye Qin, Fulei Chu
Summary: In this study, a novel computational method for nonlinear impact force in the local contact area is proposed, and the dynamic response of corrugated structures is analyzed. By establishing an equivalent shell model and using numerical solution techniques, the impact response of corrugated shells under low-velocity impact is effectively studied.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Civil
Ehsan Taati, Famida Fallah, Mohamad Taghi Ahmadian
Summary: This paper presents a nonlinear fluid-structure interaction model for analyzing the nonlinear vibrations of sandwich cylindrical shells subjected to an external compressible flow. The model considers the curvature nonlinearity and bending in shells made of advanced materials such as functionally graded (FG), metal foam, and anisogrid lattice composite. A decoupled nonlinear integral-differential equation is obtained based on the Kirchhoff-love hypotheses with geometric nonlinearities. The model also includes a nonlinear impermeability condition to account for large deformations in thin structures. Parametric studies are conducted to explore the effects of geometric ratios, boundary conditions, fluid specifications, and material variation on the shell's responses.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
Chaofeng Li, Peiyong Li, Xueyang Miao
Summary: This study proposes a model of laminated cylindrical shells with discontinuous piezoelectric layer and analyzes the nonlinear vibration control of such model with point-supported elastic boundary condition. The introduction of artificial springs to simulate arbitrary boundary conditions, derivation of elastic-electrically coupled differential equations using Chebyshev polynomials and Lagrange equations, and decoupling using negative velocity feedback adjustment are crucial. Additionally, investigating the influence of constant gain, size, and position of the piezoelectric layer on the nonlinear amplitude-frequency response highlights their significant impact on the response.
NONLINEAR DYNAMICS
(2021)
Article
Physics, Fluids & Plasmas
Wenqian Sun, Jayson Paulose
Summary: The study investigates the indentation stiffness of ellipsoidal and cylindrical elastic shells using shallow-shell theory, showing that the linear indentation response reduces to a single integral with two dimensionless parameters encoding the asphericity and internal pressure. The results provide compact analytical expressions for the indentation stiffness in various regimes and reveal insights into the pressurized cylinders' linear indentation response.
Article
Mechanics
Amit Yadav, Marco Amabili, Sarat Kumar Panda, Tanish Dey, Rajesh Kumar
Summary: This study presents a semi-analytical solution for nonlinear vibrations of circular cylindrical shells made of carbon nanotube (CNT) fiber-reinforced composite (CNT-FRC), considering factors such as CNT distribution, matrix properties, and laminate structure.
COMPOSITE STRUCTURES
(2021)
Article
Acoustics
Thi Phuong Nguyen, Trung Nguyen-Thoi, Duy Kien Tran, Duc Tuan Ho, Hoai Nam Vu
Summary: This article proposes a semianalytical approach for the nonlinear free and forced asymmetric vibration of corrugated sandwich functionally graded cylindrical shells containing fluid under harmonic radial load. The numerical investigations for the nonlinear dynamic response of cylindrical shells are obtained by using the fourth-order Runge-Kutta method. Numerical results show the very large effects of corrugation and fluid on the natural frequency and nonlinear vibration behavior of shells.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)