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
Materials Science, Composites
Haiyang Yang, Hao Zhang, Xinyu Li, Lianhua Yin, Xiaogang Guo, Hualin Fan, Hongshuai Lei
Summary: Fluted-core sandwich composites offer great potential in lightweight engineering applications. This study designed and fabricated trapezoidal fluted-core sandwich composite cylinders made of carbon fiber-reinforced plastics to improve deformation stability. The effects of circumferential cell number and wall thickness on bearing characteristics and failure mechanism were assessed. The results showed that increasing cell number and wall thickness could improve critical local buckling load and enhance specific buckling load.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Himanshu Sharma, Ranjan Ganguli
Summary: This paper investigates the reliable and robust optimum design of a higher-order sandwich composite beam under the effect of uncertainty in material properties. Various optimization approaches and surrogate models were used to enhance the efficiency of the process, and the numerical results showed significant improvement in the optimal design considering uncertainty.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Alejandro Eduardo Albanesi, Nahuel Jose Volpe, Federico Langhi, Victor Daniel Fachinotti
Summary: This study presents a simulation-based optimization approach that combines a multi-objective genetic algorithm and the finite element method to design sandwich structures for reinforced composite fuselages. The optimization considers increasing the safety factor of the reinforced fuselage and reducing the number of layers in the sandwich structure to minimize manufacturing costs. The results show improved material arrangement and a higher stress safety factor compared to the standard.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Engineering, Manufacturing
Qianqian Wu, Xin Liu, Jiajing Li, Jingwei Li, Xingyu Wei, Yang Zhao, Jian Xiong
Summary: Sandwich cylinders with a low-density pyramid-like truss core were manufactured using a sequential hot press method. The compressive strengths and failure modes were analyzed theoretically and validated experimentally, with an acceptable error between the two. A 3D failure mechanism map was developed to guide the design against buckling failure.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Multidisciplinary
Mortda Mohammed Sahib, Gyorgy Kovacs
Summary: The transportation industry requires lightweight structures for economic and environmental reasons, and composite sandwich structures are ideal for weight reduction in high-speed trains due to their high stiffness and low mass. This research aims to develop a weight and cost optimization method for high-speed train floors using Fiber Metal Laminates (FML) face sheets and a honeycomb core. Different variations of FMLs were studied to determine the optimal sandwich structure with minimum weight and cost.
APPLIED SCIENCES-BASEL
(2023)
Article
Multidisciplinary Sciences
Yang Liu, Fuwei Gu, Mingxuan Li, Xiaofeng Lu, Xiaolei Zhu
Summary: An equivalent theoretical homogenization method was proposed for composite sandwich cylinders subjected to pure bending, based on the homogeneous orthotropic layer hypothesis and Lekhnitskii's theory. The method developed is suitable for arbitrary combinations of winding layers with different winding angles and materials. Larger skin thickness and smaller winding angles were found to improve the specified bending stiffness and specified bending strength of the composite corrugated sandwich cylinders.
Article
Computer Science, Interdisciplinary Applications
Francois-Xavier Irisarri, Cedric Julien, Dimitri Bettebghor, Florian Lavelle, Yannick Guerin, Kevin Mathis
Summary: This research introduces an original strategy for designing large-scale composite sandwich structures, applicable to various thin-walled sandwich structures, utilizing multi-step strategies for variable-stiffness laminates. The method combines continuous relaxation and metaheuristics to optimize the design by minimizing overall weight.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Article
Chemistry, Physical
Gokhan Serhat
Summary: This study optimizes the eigenfrequencies of circular cylindrical laminates using lamination parameters to avoid solution dependency on initial assumptions. Results show that the maximum fundamental frequency points of laminated cylinders mostly lie at the inner lamination parameter domain, unlike singly curved composite panels. The second eigenfrequency shows a nonconvex response surface containing multiple local maxima for several cases, while frequency difference contours appear highly irregular.
Article
Construction & Building Technology
Alireza Kermani, Amir Ehsani
Summary: This study evaluated the multi-objective optimization problems of a hybrid composite grid core sandwich structure, considering the maximization of critical buckling load and the minimization of structural weight or raw material costs. The results showed that material properties and cross section shape have significant effects on the performance of the structure. The First-order Shear Deformation Plate Theory and the Ritz method were used to calculate the buckling load, and the continuous genetic algorithm was employed to find the optimal design alternative.
ADVANCES IN STRUCTURAL ENGINEERING
(2023)
Article
Polymer Science
Alaa Al-Fatlawi, Karoly Jarmai, Gyorgy Kovacs
Summary: The study focused on optimizing the performance of helicopter floors with different FRP composite layers and structural elements, considering nine design constraints. By using various software algorithms, a new method for optimizing a totally FRP composite sandwich structure was developed, which was proven to be more advantageous than traditional helicopter floors in a case study.
Article
Mechanics
Farzad Seyyedrahmani, Peiman Khandar Shahabad, Gokhan Serhat, Bekir Bediz, Ipek Basdogan
Summary: In this study, an accurate and efficient framework is developed to optimize the design of laminated sandwich panels. Genetic algorithm is used to determine Pareto-optimal solutions for various performance metrics. The results provide insights into the design requirements for improving the dynamic and load-carrying behavior of sandwich laminates.
COMPOSITE STRUCTURES
(2022)
Article
Chemistry, Physical
Zhicheng Huang, Huanyou Peng, Xingguo Wang, Fulei Chu
Summary: A finite element dynamic model of a sandwich composite plate was developed using classical laminate theory and Hamilton's principle. The model has good controllability and observability after adopting the joint reduced-order method. An optimal quadratic (LQR) controller was designed for active control of the sandwich panel, and simulation analysis was used to optimize the controller parameters, viscoelastic layer thickness, and sandwich panel covering position. Results showed that the finite element model accurately represented the dynamic characteristics of the original system, and LQR control effectively suppressed vibration of the sandwich plate. The optimal covering position was near the solid support end and the parameters were optimized based on different angles.
Article
Engineering, Civil
Pier Giovanni Benzo, Joao M. Pereira, Jos'e Sena-Cruz
Summary: This paper presents the preliminary design of a floor system based on steel web core sandwich panels with polyurethane foam core using a new genetic algorithm procedure to optimize its mass. The study also addresses the minimization of cost and environmental impact and includes practical engineering requirements. The results are presented in terms of design variables and constraints search histories as well as optimal feasible and unfeasible solutions.
ENGINEERING STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Onur Coskun, Halit S. Turkmen
Summary: A novel framework is proposed to optimize variable stiffness (VS) composite circular cylinders using the direct fiber path parameterization technique and Bezier curves. The framework leverages prior knowledge of the design space and utilizes a non-dominated sorting genetic algorithm (NSGA-II) for optimization. The optimized VS composite shell shows a significant increase in buckling load compared to the reference quasi-isotropic composite cylindrical shell.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Mechanics
Woo-Jin An, Cheol-Hwan Kim, Jin-Ho Choi, Jin-Hwe Kweon
COMPOSITE STRUCTURES
(2019)
Article
Mechanics
Viet-Hoai Truong, Byeong-Su Kwak, Rene Roy, Jin-Hwe Kweon
COMPOSITE STRUCTURES
(2019)
Article
Materials Science, Composites
Choe Hyeon-Seok, Kwak Byeong-Su, Park Seong-Min, Truong Viet-Hoai, Nam Young-Woo, Kweon Jin-Hwe
ADVANCED COMPOSITE MATERIALS
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Yeong-Hoon Noh, Jong-Gwan Yook, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Won-Ho Choi, Byeong-Su Kwak, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Manufacturing
Seong-Min Park, Rene Roy, Jin-Hwe Kweon, Youngwoo Nam
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2020)
Article
Engineering, Multidisciplinary
Byeong-Su Kwak, Won-Ho Choi, Yeong-Hoon Noh, Gi-Won Jeong, Jong-Gwan Yook, Jin-Hwe Kweon, Young-Woo Nam
COMPOSITES PART B-ENGINEERING
(2020)
Review
Materials Science, Composites
Van-Tho Hoang, Bo-Seong Kwon, Jung-Won Sung, Hyeon-Seok Choe, Se-Woon Oh, Sang-Min Lee, Jin-Hwe Kweon, Young-Woo Nam
Summary: Promising CF/PEKK composites were fabricated using Automated Fiber Placement. Mechanical properties, void content, and crystallinity were evaluated for four different postprocessing methods, with hot press yielding the best quality.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2023)
Article
Materials Science, Composites
Gi-Won Jeong, Yeong-Hoon Noh, Won-Ho Choi, Joon-Hyung Shin, Jin-Hwe Kweon, Jong-Gwan Yook, Young-Woo Nam
Summary: This study presents an electromagnetic-mechanical repair patch (EMRP) method to restore the mechanical and electromagnetic wave absorption performance of a radar-absorbing structure damaged by lightning strike. The method considers the need to maintain structural integrity and electrical continuity for high repair efficiency. Experimental results validate the feasibility of using the proposed EMRP method in repairing radar-absorbing structures.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Mechanics
Jonathan Tapullima, Sang Hoon Song, Jin Hwe Kweon, Jin Ho Choi
Summary: The study developed a new stitching process for reinforcement in composite structures and proposed a mode II analysis to define cohesive parameters. Various stitching patterns were tested with two types of dry carbon fiber yarns as reinforcement.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Young-Woo Truong, Viet-Hoai Hoang, Van-Tho Choe, Hyeon-Seok Nam, Jin-Hwe Kweon
Summary: This study investigated the delamination growth behavior of curved composite laminates at elevated temperatures, finding that the failure load decreased significantly with increasing temperature. The delamination propagation process varied significantly with temperature, and finite element analyses were used to determine cohesive parameters that accurately represented the delamination behavior at high temperatures. Comparisons between numerical and experimental results showed good agreement in terms of failure load and modes, with a thorough discussion on the effect of temperature on the failure mechanism.
ADVANCED COMPOSITE MATERIALS
(2022)
Article
Materials Science, Composites
Boseong Kwon, Hyeonseok Choe, Jaehyeng Jeong, Hyunwoo Ju, Jin-Hwe Kweon, Young-Woo Nam
Summary: This paper investigates the mechanical properties of carbon fiber reinforced polyetherketoneketone (CF/PEKK) thermoplastic induction-welded composite joints, using finite element modeling and simulation to analyze temperature behavior and experimental results. Single-lap shear strength tests were conducted to check weld quality, revealing that optimal process parameters could potentially improve mechanical performance.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Mechanics
Rene Roy, Lawrence Prince Raj, Je-Hyun Jo, Min-Young Cho, Jin-Hwe Kweon, Rho Shin Myong
Summary: In this study, the thermal response of a thin etched-foil heating film-based IPS integrated into CFRP laminates was characterized both experimentally and by thermal FEM simulation. The research revealed that by adjusting parameters such as the heater heat flux, anti-icing functionality of the IPS could be achieved.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Boseong Kwon, Wonwoo Choi, Hyunwoo Ju, Jin-Hwe Kweon, Young-Woo Nam
Summary: This study investigated the consolidation process of radial-type braided carbon fiber reinforced polyetherketoneketone (CF/PEKK) thermoplastic composite tubes. Different consolidation processes were evaluated, and the OML-PTFE consolidation process showed a flat surface without wrinkles and low void content, making it suitable for manufacturing thermoplastic composite tubes for actual aircraft use. Other processes resulted in high void content, making them less appropriate.
FUNCTIONAL COMPOSITES AND STRUCTURES
(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)