Article
Engineering, Civil
C. Shawn Sun, Oluwatobi F. Babarinde, Dinesha Kuruppuarachchi, Daniel G. Linzell, Jay A. Puckett, Emmanuel Akintunde
Summary: The bottom flanges of Louisiana's bridges' continuous span stringers may experience compression-induced lateral torsional buckling. The AASHTOWare Bridge RatingTM analysis software used to rate these stringers may underestimate their flexural strength due to inadequate consideration of bracing effects provided by a noncomposite deck. Experimental and analytical studies have shown that considering the bracing effects of a concrete deck can possibly triple the stringers' lateral torsional buckling resistance.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Civil
Costas D. Kalfountzos, George S. E. Bikakis, Efstathios E. Theotokoglou
Summary: This article investigates the postbuckling and secondary buckling response of simply supported and clamped rectangular fiber-metal laminates (FMLs) and glass-fiber reinforced composite plates subjected to uniaxial compression. A novel FEM procedure is proposed to locate the secondary buckling point, and the correlation between the secondary buckling load and the plate aspect ratio is established.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Yahui Zhang, Bin Kong, Jiefei Gu, Puhui Chen, Binwen Wang
Summary: Two types of variable stiffness laminates were designed and manufactured based on adequate consideration of process constraints and defect control methods of tow curve placement. A comprehensive experiment was conducted using a 3D digital image correlation system, strain gauges, and displacement meters. The measured results showed significant improvements in the buckling and failure loads of the variable stiffness specimens, with at least 40% and 70% increase, respectively. The FEA results of out-of-plane displacement and strain were consistent with the experimental results, and the higher buckling and failure loads of the variable stiffness specimens were explained by numerical results.
THIN-WALLED STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Jian Shi, Mingbo Tong, Chuwei Zhou, Congjie Ye, Xindong Wang
Summary: This study experimentally tested and simulated the failure types and ultimate loads of eight carbon-epoxy laminate specimens with a central circular hole subjected to tensile load using two different progressive failure analysis methodologies, which showed good agreement between numerical simulation and experimental results. The failure paths and accurate damage contours for the tested specimens were successfully predicted.
APPLIED SCIENCES-BASEL
(2021)
Article
Mechanics
Patryk Jakubczak, Piotr Podolak, Magda Drozdziel-Jurkiewicz
Summary: The aim of this study was to evaluate the compressive strength of Fibre Metal Laminates (FMLs) after impact. The main objective was to analyze the damage growth range, size, and mechanisms during load under different initial damage states and final post-impact strength. Glass fibre/titanium and carbon fibre/titanium FMLs were tested and analyzed. The research identified and characterized three load bearing states of FMLs based on force reduction characteristics. Additionally, it was found that the strength reduction of FMLs does not decrease significantly with impact energy, possibly due to the protective role of elastic-plastic metal layers.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Dean Chen, Yuhai Xiang, Nitesh Arora, Qi Yao, Jian Li, Stephan Rudykh
Summary: In this paper, the post-buckling development of instability-induced patterns in soft particulate composites is investigated. Microstructural buckling occurs when the composite reaches the critical strain level. Interestingly, the initial buckling mode may evolve into different new patterns in the post-buckling regime, which are determined by the initial microstructure parameters. The different post-buckling patterns are further characterized using the discrete Fourier transform (DFT) analysis, and the results show that they can evolve into complex new shapes beyond simple deformation amplification.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Nima Shabanijafroudi, Rajamohan Ganesan
Summary: The proposed methodology offers a solution for predicting the buckling and postbuckling behavior of composite plates with delamination, with a focus on addressing fracture mechanics phenomena in the postbuckling regime. By utilizing a new laminate partitioning scheme and modeling sublaminates with the first-order shear deformation theory, displacement consistency near the crack tip is improved. The use of a penalty function method enforces the continuity of the displacement field across sublaminate interfaces, while the equilibrium equations are derived using the Ritz method and solved with an arc-length method.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Ozkan Ozbek, Nurettin Furkan Dogan, Omer Yavuz Bozkurt, Ahmet Erklig
Summary: This study investigates the effects of nanoclay particles on the buckling behavior of carbon/Kevlar intraply hybrid composites. The results showed that the introduction of 1wt% nanoclay particles increased the axial and lateral critical buckling loads by 21.12% and 25.33% respectively. However, the inclusion of nanoclay particles with a higher amount than 1wt% led to a decreasing trend in critical loads for both buckling loadings. The failure modes observed were matrix fragmentation and delamination.
POLYMER COMPOSITES
(2023)
Article
Mechanics
Zhaofei Xiao, Philip Harrison
Summary: A numerical tool called "SteerFab" based on Matlab was developed to predict steered fibre patterns and analyze the mechanical properties of variable stiffness panels. The optimized steered-fibre patterns were found to significantly improve the buckling and failure loads for both carbon-epoxy and glass-epoxy composites.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Mahdi Damghani, Rakib Ali Pir, Adrian Murphy, Mohammad Fotouhi
Summary: This study investigates the collapse behavior of laminates with cut-outs under shear loading, focusing on the influence of laminate shapes and hybridization on their post-buckling response. Experimental and numerical analysis show that a hybrid laminate design with shaped CFRP plies exhibits greater failure load and failure load to buckling load ratio compared to a pure CFRP design, despite having less CFRP material. However, the hybrid design has a slightly lower initial plate buckling load and endures more widespread shear damage of the matrix.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
T. M. Harrell, O. T. Thomsen, J. M. Dulieu-Barton
Summary: This study evaluates the structural responses of carbon fibre reinforced polymer (CFRP) panels damaged by lightning strikes using a multi-scale model. Material conditions obtained from a meso-scale lightning damage model are introduced into a structural scale finite element model. The model predicts stresses, displacements, and failure using buckling/post-buckling Riks' simulations and LaRC failure criteria. The predictions of the numerical model are validated experimentally using load-displacement data from CFRP test panels, and show excellent agreement with the experimental results.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
C. Shawn Sun, Daniel G. Linzell, Jay A. Puckett, Ahmed Rageh
Summary: An extensive experimental study was conducted to evaluate the lateral torsional buckling resistance of two-span continuous steel beams. The results showed that minimal bracing can significantly increase the buckling resistance and justify higher capacity ratings for continuous stringers than what is currently used.
ENGINEERING JOURNAL-AMERICAN INSTITUTE OF STEEL CONSTRUCTION
(2023)
Article
Engineering, Civil
Hamda Chagraoui, Tarek Lazghab, Mohamed Soula
Summary: This paper investigates the effect of a new sub-structural configuration (omega sub-stiffener) on the buckling and post-buckling performance of an existing T-stiffened composite panel design. An optimization framework is proposed to optimize the distribution of omega sub-stiffeners, the laminate stacking sequences, and the ply orientation angles of omega sub-stiffened composite panels to yield higher initial buckling performance without adding mass. Results show that introducing omega sub-stiffeners into the T-stiffened composite panel can result in an increased initial buckling performance (+242.63%) and alters the failure behavior and further affects the initiation and propagation of various failure modes.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Jan Zavodnik, Yunbo Wang, Wenzhong Yan, Miha Brojan, Mohammad Khalid Jawed
Summary: A new class of thin flexible structures that can transform from flat to prescribed 3D shapes is introduced. By utilizing strain mismatch and kirigami cuts, control over the target shape can be achieved. The concept is demonstrated through circular composite plates, and the tools developed can be extended to attain arbitrary 3D shapes.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Polymer Science
Ludmila Fridrichova
Summary: Car buyers today have high demands for the quality of purchased goods, including the interior of the car such as the seats. To avoid customer complaints, the manufacturer needs a new methodology to evaluate the appearance defects of textile laminates used for seat production. This study describes a methodology based on buckling theory and introduces a newly developed device.
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)