Article
Mechanics
Mehmet Turan Demirci, Omer Sinam Sahin
Summary: This study conducted low-velocity impact tests on E-glass fiber and basalt fiber reinforced hybrid composite pipes, evaluating the dynamic behaviors and damage formation under different oil filling conditions and impact energies.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Roham Rafiee, Reza Shahzadi, Hossein Speresp
Summary: An optimization procedure is developed to obtain the optimal structural design of filament wound composite pipes for pressurized water and waste-water pipelines with minimum cost. Proper computational tools are developed to predict the structural properties of the composite pipes based on the design architecture of layers and validated through experimental analysis. An integrated design-optimization process is developed to minimize cost, considering design requirements and manufacturing limitations. The method is implemented in various case studies with satisfactory results.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2022)
Article
Engineering, Civil
Zeynal Abidin Oguz, Ozkan Ozbek, Ahmet Erklig, Omer Yavuz Bozkurt
Summary: This study investigates the crushing properties of hybrid glass, basalt, and carbon fiber-reinforced composite pipes under a hydrothermal aging environment. The results show that the hybrid basalt pipes absorb the most water and that hydrothermal aging has adverse effects on the crushing characteristics of the pipes. However, hybridization can enhance the crushing properties of the non-hybrid pipes.
ENGINEERING STRUCTURES
(2023)
Article
Polymer Science
Seyit Mehmet Demet, Harun Sepetcioglu, Mehmet Bagci
Summary: Basalt/epoxy composite pipes were produced using CNC filament winding machines, and five different particle impingement angles were used to determine the erosive effect on the outer surfaces of these pipes. The winding patterns in specific regions of the pipes were found to have significant effects on solid particle erosion resistance, as shown by SEM images.
Article
Mechanics
Ammar Maziz, Mostapha Tarfaoui, Said Rechak, Mourad Nachtane, Lokman Gemi
Summary: This study investigates the damage initiation and evolution of filament wound hybrid composite pipes under low-velocity impact, revealing that damage mainly occurs through matrix cracking and discussing the evolution of damage in tension, compression, and shear in detail.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Mechanics
Yipeng Chang, Yu Zhou, Nan Wang, Konghan Lu, Weidong Wen, Ying Xu
Summary: In this paper, a comprehensive 3D finite element model is established to study the mechanical behavior and failure process of Filament Wound Composites (FWC) under different loading conditions. The model considers the fluctuation and lamination characteristics of FWC fiber arrangement and incorporates the Generalized Method of Cell (GMC) into the ANSYS software. Three different failure criteria are used to analyze the progressive damage of FWC. The results show that the simulation method can accurately predict the mechanical properties and failure process of FWC.
COMPOSITE STRUCTURES
(2023)
Article
Polymer Science
Tamer Ali Sebeay, Azzam Ahmed
Summary: In this study, glass-fiber-reinforced plastic composite pipes with various fiber angles, wall thicknesses, and lengths were subjected to hydrostatic pressure to analyze their pressure capacity, stress, and deformation. The results showed that composite pipes with a fiber angle of ±55 degrees and larger wall thickness had higher pressure capacity.
Article
Mechanics
Dilek Soylu Gemi, Omer Sinan Sahin, Lokman Gemi
Summary: The study investigated the effects of low velocity impacts on GRP composite pipes of different diameters, finding that as diameter increases, the impact of low velocity impacts decreases and damage transforms into delamination damage.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Roham Rafiee, Reza Shahzadi, Soheil Jafari
Summary: A multi-objective and multi-level optimization procedure is developed for obtaining optimal structural design of filament wound composite pipes in the oil and gas industries. The procedure integrates a hybrid design-optimization platform, combining a multi-objective genetic algorithm and a premutation-based direct search approach. It aims to minimize the cost of the pipe while maximizing other structural properties, taking into consideration manufacturing limitations and design requirements.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Pei Geng, Jingzhong Xing, Qizhi Wang
Summary: A new multi-angle filament wound model is proposed for calculating stresses and displacements under multiple combined loads, providing a theoretical foundation for damage analysis and optimization of filament wound structures through analytical solutions and numerical verification.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Chemistry, Physical
Cheng Chang, Zhenyu Han, Xinyu Li, Shouzheng Sun, Jihao Qin, Hongya Fu
Summary: This paper investigates the winding preparation technology of polymer-matrix composite tee pipes, proposing a novel non-geodesic trajectory design method and post-processing techniques for achieving full coverage of tee pipes. Experimental results demonstrate the high accuracy and feasibility of these methods.
Article
Polymer Science
Artem Andrianov, Erika Kamada Tomita, Carlos Alberto Gurgel Veras, Bruno Telles
Summary: This paper explains the methodology and results of empirical work on the development of low-cost filament winding technology for manufacturing high length-to-diameter ratio polymer composite structures. The authors derived analytical equations for the winding trajectory of a four-axis filament-winding machine and successfully validated their feasibility. Additionally, they evaluated the fiber volume ratio in the wound composite parts.
Article
Mechanics
Jia-le Che, Min-Gu Han, Seung-Hwan Chang
Summary: The study analyzed a Type III hydrogen pressure vessel composed of an aluminum liner and composite layers, focusing on the rapidly changing thickness of the composite layers at the dome part. By considering the helical winding angles and hoop winding controls, the varying thickness at the junction of the cylinder and dome parts was precisely estimated. The effect of geometric changes in composite layers on the filament overhead was examined, leading to an analytical prediction of composite thickness at the dome part, which was verified using finite element analysis.
COMPOSITE STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Guo-min Xu, Chang-geng Shuai
Summary: This paper investigates the stability of hyperbolic flexible pipes based on the composite Reissner shell theory and the transfer-matrix method, considering the nonlinear stretch of the reinforced filament and the fiber bridge effect. The results indicate that a large winding angle reduces deformation and stress, high tensile modulus of the filament reduces deformation, and non-geodesic winding trajectories improve pipe stability.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Xiaodong Zhao, Jianguo Liang, Chunjiang Zhao, Jianglin Liu, Yinhui Li, Lianyun Jiang, Jun Feng, Yuqin Xue
Summary: This paper investigates the failure behavior of composite layers fabricated using an innovative multi-filament winding (MFW) process under impact load. The results show that the composite layers of the MFW technique exhibit superior impact resistance properties in terms of maximum contact force, absorbed energy, and inter-laminar and intra-laminar damage, demonstrating high winding efficiency and exceptional performance of manufactured products that can meet the increasing demand of winding products over the years.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Ceyhun Aksoylu, Yasin Onuralp Ozkilic, Sakir Yazman, Lokman Gemi, Musa Arslan
Summary: The construction sector in Turkey started using concrete prefabrication in the late 1960s, especially in industrial buildings. The main disadvantage of prefabricated structures is the damages that occur, especially in the region of hinged connection, particularly after prolonged snowfall. This study conducted numerical and experimental examinations on the behavior of thinned end purlins under vertical loading, providing a foundation for new parametric studies.
Article
Materials Science, Multidisciplinary
Emin Uslu, Mehmet Gavgali, Mehmet Okan Erdal, Sakir Yazman, Lokman Gemi
Summary: This study focused on the production and mechanical properties of two-phase polymer matrix composites reinforced with various types of thermoplastic nanofibers. The best mechanical properties were obtained from N66 nanofiber composite, while PVA nanofiber composite showed the highest Young's modulus. The polymer type significantly affected the composite performance, with N66 composite being more stable and reproducible compared to other specimens.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Mechanics
Ammar Maziz, Mostapha Tarfaoui, Said Rechak, Mourad Nachtane, Lokman Gemi
Summary: This study investigates the damage initiation and evolution of filament wound hybrid composite pipes under low-velocity impact, revealing that damage mainly occurs through matrix cracking and discussing the evolution of damage in tension, compression, and shear in detail.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Mechanics
Dilek Soylu Gemi, Omer Sinan Sahin, Lokman Gemi
Summary: This study investigates the effects of low velocity impacts on GRP composite pipes, analyzing damages such as matrix crack, fiber damage, and inter layer separation. Results show that impacts may lead to strength losses in composite pipes, highlighting the importance of understanding and preventing such damages in their applications.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Dilek Soylu Gemi, Omer Sinan Sahin, Lokman Gemi
Summary: The study investigated the effects of low velocity impacts on GRP composite pipes of different diameters, finding that as diameter increases, the impact of low velocity impacts decreases and damage transforms into delamination damage.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Lokman Gemi, Emrah Madenci, Yasin Onuralp Ozkilic
Summary: This paper presents experimental, analytical, and numerical analyses on the behavior of pultruded GFRP composite beams infilled with hybrid fiber reinforced concrete under four-point loading. The study found that the pultruded profile and composite wrapping significantly improved the performance of the beams, with hybrid reinforcements being recommended for all cases. Detailed damage analyses were also provided.
ENGINEERING STRUCTURES
(2021)
Review
Energy & Fuels
Mohammad Azeem, Hamdan Haji Ya, Mohammad Azad Alam, Mukesh Kumar, Pawel Stabla, Michal Smolnicki, Lokman Gemi, Rehan Khan, Tauseef Ahmed, Quanjin Ma, Md Rehan Sadique, Ainul Akmar Mokhtar, Mazli Mustapha
Summary: This article reviews the application of filament winding technology in gas storage and transportation, discussing the challenges and optimization methods in the design and manufacturing process.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Civil
Sakir Yazman, Ceyhun Aksoylu, Lokman Gemi, Musa Hakan Arslan, Ahmed Abed Hamad, Yasin Onuralp Ozkilic
Summary: This study investigated the strengthening of shear deficient T-beams with different CFRP configurations. Results showed that the contribution of EBR to shear capacity is significant and depended on anchorage angle and strengthening type. Among all methods, full wrapping CFRP and partial CFRP with a 45-degree anchorage type yielded the most effective results in enhancing shear capacity and stiffness while improving ductility significantly.
Article
Engineering, Civil
Yasin Onuralp Ozkilic, Ceyhun Aksoylu, Sakir Yazman, Lokman Gemi, Musa Hakan Arslan
Summary: This study investigates the behavior of reinforced concrete beams with circular openings and the effects of strengthening them with CFRP. Various parameters such as the opening/beam height ratio, concrete compressive strength, stirrup spacing, and CFRP application type were considered in the analysis. The study identifies important parameters that affect the performance of the beams and provides recommendations for CFRP strengthening based on different conditions.
Review
Mechanics
Mehmet Akif Dogan, Sakir Yazman, Lokman Gemi, Murat Yildiz, Ahmet Yapici
Summary: This article investigates traditional and nontraditional machining methods in the machining of FML, and determines the most suitable processing methods and parameters to minimize defects and achieve better hole quality.
COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Lokman Gemi, Emrah Madenci, Yasin Onuralp Ozkilic, Sakir Yazman, Alexander Safonov
Summary: This paper presents experimental studies on the effect of FRP composite wrapping on the flexure performance of RC filled pultruded GFRP profile hybrid beams with damage analysis. The results show that the use of GFRP and CFRP composites for wrapping can significantly improve the structural performance of the beams, including maximum load-carrying capacity, initial stiffness, and ductility.
Article
Mechanics
Alexander Vedernikov, Lokman Gemi, Emrah Madenci, Yasin Onuralp Ozkilic, Sakir Yazman, Sergey Gusev, Artem Sulimov, Julia Bondareva, Stanislav Evlashin, Stepan Konev, Iskander Akhatov, Alexander Safonov
Summary: By analyzing the relationship between pulling speed, morphology, and mechanical properties of pultruded glass fiber/vinyl ester resin composites, this study demonstrates the possibility of high-speed pultrusion for large cross-section profiles suitable for structural application. The results show that higher pulling speeds lead to the presence of bubbles, voids, and cracks, but significantly increase the output without compromising mechanical performance.
COMPOSITE STRUCTURES
(2022)
Article
Construction & Building Technology
Yasin Onuralp Ozkilic, Lokman Gemi, Emrah Madenci, Ceyhun Aksoylu, Ilker Kalkan
Summary: The present study aims to determine the contribution of pultruded FRP encasements and additional FRP wraps to the shear strength and load-deflection behavior of reinforced concrete beams. Testing nine hybrid beams with varying shear span-to-depth ratios, the research found that GFRP wraps significantly contribute to the ductility and strength of composite beams, allowing them to achieve greater ductility and strength values compared to beams with larger depths.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Construction & Building Technology
Lokman Gemi, Mohammed Alsdudi, Ceyhun Aksoylu, Sakir Yazman, Yasin Onuralp Ozkilic, Musa Hakan Arslan
Summary: This study experimentally investigates the behavior of shear deficient reinforced concrete beams with rectangular cross-sections externally strengthened with CFRP composite under vertical load. The research finds that the direction and weight of CFRP composite are critical factors influencing the beam behavior, and should be considered in the calculation of shear capacity formulas.
STEEL AND COMPOSITE 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)
