Article
Engineering, Aerospace
Yongwei Wang, Deng Zhou, Gang Yan, Zhuangjie Wang
Summary: This study investigates the residual mechanical properties of honeycomb sandwich composite structures after a lightning strike, using simulated tests and numerical predictions.
Article
Materials Science, Composites
Xiaodong Xu, Scott L. J. Millen, Juhyeong Lee, Gasser Abdelal, Daniel Mitchard, Michael R. Wisnom, Adrian Murphy
Summary: Research on residual strength after lightning strike is increasing, but there are currently no standard test methods for measuring residual compressive strength. A systematic experimental study was conducted to evaluate modifications in specimen geometry and test jig design to induce specimen failure at the lightning damage region. Test set-up modifications were made considering the scale of the lightning damage. The Compression After Lightning (CAL) strength was significantly lower than the pristine CAI strength even at a relatively low peak current of 25 kA, indicating the need for careful modifications.
APPLIED COMPOSITE MATERIALS
(2023)
Article
Mechanics
F. Alizadeh, R. Mazruee Sebdani, C. Guedes Soares
Summary: In this study, the residual ultimate strength of a composite laminate with delamination under in-plane compressive loading is determined numerically using the finite element method. The delamination growth is predicted and modeled using linear fracture mechanics and the virtual crack closure technique. The results show that the load-carrying capacity of the structure is reduced due to the expansion of the delaminated area. Despite its simplicity and efficiency, this method allows for the calculation and prediction of strain energy release rates at different fracture modes in the delamination region.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Vipin Kumar, Wenhua Lin, Yeqing Wang, Ryan Spencer, Subhabhrata Saha, Chanyeop Park, Pritesh Yeole, Nadim S. Hmeidat, Cliff Herring, Mitchell L. Rencheck, Deepak Kumar Pokkalla, Ahmed A. Hassen, Merlin Theodore, Uday Vaidya, Vlastimil Kunc
Summary: Improving the through-thickness electrical conductivity can enhance the lightning strike resistance of carbon fiber reinforced polymers (CFRPs).
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Bangxiong Liu, Jiamei Lai, Hesheng Liu, Zhichao Huang, Bin Liu, Ze Peng, Wei Zhang
Summary: This study investigates the edge-on impact damage mechanism and residual strength in compression of composite laminates, considering variations in impact energy, stitching, and stitching density. The damage to the laminate after edge-on impact is examined using visual inspection, electron microscopic observation, and X-ray computed tomography techniques. The findings suggest that stitching technique improves damage tolerance and residual strength, inhibits crack expansion, and the effect increases with increasing suture density.
Article
Materials Science, Composites
Piotr Bajurko
Summary: The research compared the resistance to damage of thermosetting and thermoplastic fabric carbon composites, finding that the thermoplastic laminate has higher residual strength with lower impact energy, which decreases as impact energy increases.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2021)
Article
Mechanics
Sukanta Das, Vipin Kumar, Juhyeong Lee, Tomohiro Yokozeki, Takao Okada
Summary: Different thicknesses of polyaniline-based lightning strike protection coatings were tested on composite materials, showing that they are suitable for protecting GFRP composites but careful design is needed for CFRP composites to avoid failure.
COMPOSITE STRUCTURES
(2022)
Article
Thermodynamics
Zezhong Shan, Xuyu Liu, Xiang Lu, Kai Ma, Haijian Xiao, Minghui Tian
Summary: In this study, a lightning ablation damage model of laminates with multiple fasteners is established, and the effect of different installation methods of multiple fasteners on the damage is studied. The results show that the installation layout of fasteners has an important impact on the damage results.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Mechanics
M. Rathnasabapathy, A. P. Mouritz, A. C. Orifici
Summary: The study found that the amount of impact damage and post-impact compressive strength of the fibre metal laminate (FML) depended on the type and magnitude of the preload under different loading conditions. More severe damage was induced under tension preload, with greater reduction in post-impact strength compared to compression.
COMPOSITE STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Fang Chen, Weixing Yao, Wen Jiang
Summary: This study reveals the impact of impact damage on the compressive bearing capacity of CFRP laminates and provides a numerical method for simulating damage responses under both impact and compression loads.
ENGINEERING COMPUTATIONS
(2021)
Article
Archaeology
Jingxiao Li, Zhiling Fang, Jing Li, Tao Zhang, Shangchen Fu, Lin Fu, Peidong Huo
Summary: The study observed the changes in microstructure and composition of glazed roof tiles after lightning strikes using scanning electron microscopy and energy dispersive spectrometry, and found pits, color fading, and cracks on the glaze layer. The lightning strike also caused changes in the compositions of the glaze layer and body, with increased content of Pb and decreased content of Cu. These findings provide theoretical references and experimental support for further investigations into lightning protection measures for glazed tiles.
JOURNAL OF CULTURAL HERITAGE
(2023)
Review
Mechanics
S. L. J. Millen, A. Murphy
Summary: This article focuses on the increasing use of electrically resistive composites in aircrafts, the importance of analysing lightning strike damage, and the role of simulations in this analysis. It reviews the modeling and simulation approaches in literature, particularly focusing on material properties, construction, loading strategies, meshing methods, and results. Discussions on current and proposed lightning strike modeling approaches, along with their limitations and future challenges, are also presented.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Shao-ce Dong, Cheng-gao Li, Gui-jun Xian, Zhong-jie Zhao, Xu-feng Zhang, Qing-wen Yun
Summary: By studying the use of non-metallic lightning strike protection film covering carbon fiber reinforced polymers (NM-LSP covering CFRP) in aircraft elevators, it was found that the new elevator can reduce environmental impact and achieve reductions in categories such as human toxicity potential and marine aquatic ecotoxicity potential. The study also highlighted the significant contribution of the service phase to the environmental impact of the elevators.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2022)
Article
Materials Science, Multidisciplinary
J. Llobet, P. Maimi, A. Turon, B. L. Bak, E. Lindgaard, L. Carreras, Y. Essa, F. Martin de la Escalera
Summary: This paper continues the study on damage mechanisms of composite laminates under static and fatigue loads, investigating the effects of intralaminar and interlaminar damage on residual strength through experiments and numerical simulations. The results show that the main fatigue degradation mechanisms are well captured in the simulations, except for the open-hole specimen which needs further improvement.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Huixin Zhu, Kunkun Fu, Haiqing Liu, Bin Yang, Yuan Chen, Chengzhao Kuang, Yan Li
Summary: This study establishes a design framework for a dual-layer LSP system for CFRP composites, and validates its effectiveness through FE modeling and simulated lightning strike experiments. It systematically examines the effects of geometric and electrical parameters on the protective effectiveness, and optimizes them through a multi-objective optimization method to achieve high effectiveness and light weight. This work provides theoretical and practical guidance for designing a dual-layer LSP system for CFRP composites.
COMPOSITES PART B-ENGINEERING
(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)