Article
Engineering, Civil
Emad Sobhani
Summary: This article discovers the Natural Frequencies (NFs) associated with Coupled Hyperboloidal-Cylindrical Shells (CHCSs) for the first time. The General Three-Dimension Shell Theory (GTDST) is combined with the First-order Shear Deformation Theory (FSDT) to obtain the core relationships of CHCSs. The Governing Differential Motion Equations (GDMEs) referenced to the CHCSs are determined using Hamilton's principle and discretized using the Generalized Differential Quadrature Method (GDQM). The obtained numerical outputs serve as a benchmark for future investigations and examples are developed to consider the effect of geometrical measures on the NFs of CHCSs.
THIN-WALLED STRUCTURES
(2023)
Article
Mathematics
Yuhua Zhou, Yanhu Zhang, Brighton Nyasha Chirukam, Jianwei Li, Congshan Lu, Masoud Babaei, Kamran Asemi
Summary: This paper studies the free vibration response of a stiffened functionally graded graphene nanoplatelet (GPL)-reinforced composite multilayer cylindrical shell panel. The shell is stiffened by both stringers and rings. The effects of different factors on the natural frequencies of the shell panel have been studied, including various weight fractions and patterns of GPLs nanofillers, the geometry of the shell panel and stiffeners, and two displacement boundary conditions.
Article
Mechanics
Ali Talezadehlari
Summary: The free vibration behavior of a composite shell/panel with and without a central square cutout is studied using the Multi-domain Generalized Differential Quadrature (GDQ) method. The study focuses on decomposing the physical domain into several elements with uniform properties and continuous conditions. The governing equations are derived and solved using GDQ method, with comparison made to existing results for verification. The study also investigates the effects of different parameters on the vibration behavior of the composite shell/panel.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Obukho E. Esu, Ying Wang, Marios K. Chryssanthopoulos
Summary: This paper presents a novel method for integrity assessment and damage identification of structural systems approaching end of service life, utilizing LVMP frequencies to detect, locate, and quantify damage. The method was found to be over 90% accurate in detecting, locating, and quantifying damage through numerical verification studies.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Mechanics
Kushal Jana, Salil Haldar
Summary: The present article aims to develop a finite element formulation for FGM plates carrying concentrated and distributed mass. First-order shear deformation theory with consideration of physical neutral surface has been employed. Nine noded isoparametric element with five degrees of freedom at each node is used for this finite element analysis. To understand the effect of grading pattern under overhead mass carrying conditions, three types of FGMs have been analyzed. The effect of non-dimensional parameters such as aspect ratio, thickness ratio, power index, the intensity of mass etc. are extensively studied. It will bring new insights to the field of FGM structures.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Thermodynamics
S. Zghal, S. Trabelsi, A. Frikha, F. Dammak
Summary: This article presents a method for thermal free vibration analysis of functionally graded material (FGM) using an improved first-order shear deformable (I-FSDT) shell model. The effective material properties of FGMs are estimated based on a power law distribution with temperature dependency, and the results are validated against literature. The I-FSDT finite shell element model is accurate and does not require shear correction factors, making it suitable for analyzing FG plate and shell structures with thermal effects.
JOURNAL OF THERMAL STRESSES
(2021)
Article
Engineering, Civil
Abdeldjebbar Tounsi, Adda Hadj Mostefa, Amina Attia, Abdelmoumen Anis Bousahla, Fouad Bourada, Abdelouahed Tounsi, Mohammed A. Al-Osta
Summary: This paper investigates the free vibration of temperature-dependent functionally graded plates resting on a viscoelastic foundation using a newly developed simple first-order shear deformation theory. The proposed model contains only four unknown variables and does not require a shear correction factor. The study shows progress in predicting the frequencies of temperature-dependent FGPs.
STRUCTURAL ENGINEERING AND MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Van-Loi Nguyen, Suchart Limkatanyu, Huu-Tai Thai, Jaroon Rungamornrat
Summary: This study introduces a new approach to analyze the free vibration of spherical shell segments using a first-order shear deformation shell theory. The shell structure is made of a functionally graded porous graphene platelet reinforced composite material, which is strengthened by graphene platelets. The effective material properties are determined using a modified Halpin-Tsai micromechanical model and mixture rule. Various types of porosity distributions and graphene platelet dispersions are considered. The results show that the proposed method accurately predicts the behavior of the spherical shell segments, and further investigations are needed to determine the optimal profile of the novel material.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Mechanics
Miao Wang, Yong-Gang Xu, Pizhong Qiao, Zhi-Min Li
Summary: In this study, semi-analytical solutions for buckling and free vibration analysis of graphene-reinforced composite laminated plates are presented using the multi-term Kantorovich-Galerkin method. Various factors affecting the behavior are examined, revealing interesting findings such as the equivalence of uniaxial buckling loads and the change in buckling mode with aspect ratio.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
G. S. Pavan, Hemanth Muppidi, Jagabandhu Dixit
Summary: Isogeometric collocation (IGA-C) method is an efficient computational approach for solving boundary value problems. It outperforms conventional finite element method and Galerkin-Isogeometric approaches in terms of computational efficiency. IGA-C method does not require assembling global stiffness matrix and only needs one integration point per element. For the analysis of laminated composite beams, beam finite elements based on IGA-C method can provide accurate results.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Mechanics
Kushal Jana, Subham Pal, Salil Haldar
Summary: This article analyzes rectangular functionally graded material plates with rectangular cutouts of diverse sizes, numbers, and positions for free vibration using Mindlin's first-order shear deformation theory (FSDT). Isoparametric plate elements of nine nodes and five degrees of freedom at each node were used for the present finite element formulation. The Poisson ratio is assumed to be constant throughout the plate. The study considers various factors such as shapes, sizes, numbers, positions of cutouts, thickness ratio, aspect ratio, FGM power law index, and different edge conditions to obtain new results.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Acoustics
Matthew de Brett, Tore Butlin, Ole M. Nielsen
Summary: This paper investigates the nonlinear dynamics of vehicle suspension dampers by conducting experimental measurements and modeling. The results reveal that friction and piston valve mechanisms play significant roles in the nonlinear dynamics of front dampers, while the nonlinear dynamics of rear dampers are mainly caused by the piston valves.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Aerospace
Emad Sobhani
Summary: This paper evaluates the free vibration performance of Combined Paraboloidal Conical Shell (CPCS) structures for the first time and proposes a new analysis method. By applying relevant theories and methods, the primary relationships and governing differential motion equations between shell segments of the CPCS structure are discovered, and the natural frequency parameters of the structure are determined using the eigenvalue method. The proposed method is validated by comparing the results with a commercial software, and a maximum error of less than 0.5% is observed. These research findings can serve as a benchmark for future studies.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
V Kumar, S. J. Singh, V. H. Saran, S. P. Harsha
Summary: This paper presents a study on the free vibration analysis of tapered Functionally Graded Material (FGM) plates, using FSDT and HSDT models for comparison, with the finding that the Pasternak foundation effect dominates over the Winkler foundation. The governing equations are obtained through Hamilton's principle, and solutions are derived using the Galerkin-Vlasov method.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Civil
Jiaming Guo, Zaoxu Zhang, Changguo Wang
Summary: This paper investigates the vibrational frequencies and modes of kinked inflatable beams and predicts their natural frequencies through theoretical analysis. The results indicate that kinking greatly reduces the first-order natural frequency of the inflated beam.
THIN-WALLED STRUCTURES
(2022)
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)