Article
Mechanics
Hao Wang, Suchao Xie, Zhejun Feng, Kunkun Jing, Jing Zhang, Hui Zhou
Summary: To enhance the mechanical properties of Nomex honeycomb, in-situ foaming using rigid polyurethane (PU) foam and flexible polyurethane foam (NHRPU, NHFPU, collectively NHPU) was performed. Mechanical properties were evaluated through tests, theoretical and finite element methods. The results showed that NHRPU and NHFPU significantly improved energy absorption, with NHRPU enhancing the absorption performance and NHFPU enhancing the resilience of the honeycomb.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Linhao Cheng, Yuan Si, Zhengjiang Ji, Jianhui Xu, Jiachen Dong, Zhiheng He, Ruilin Huang, Lin Zheng, Leilei Yan, Xitao Zheng
Summary: In this study, a novel scheme of structure/function integrated design based on composite square honeycomb structure (SHS) was proposed to enhance the electromagnetic (EM) wave absorption and compressive properties. Through winding continuous carbon fiber (CF) wires around orthogonal honeycomb walls, a new spoof surface plasmon polaritons (SSPPs) structure that serves as the core of EM wave absorption can be obtained. The interlocked SHS realizes broadband (5-20 GHz), multiangle (0-70 degrees) and efficient (average over 90%) absorption performance for EM wave. Furthermore, the PMI foam-filled SHS, formed by cutting and inserting polymethacrylimide (PMI) foam into the space of honeycomb core, demonstrates significantly improved mechanical properties.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Suchao Xie, Zhejun Feng, Hui Zhou, Da Wang
Summary: This study analyzed the bending behavior and energy absorption characteristics of Nomex honeycomb sandwich panels, providing data and theoretical support for their practical application. By clarifying the relationship between bending performance and specification parameters, and creating a failure map, the study aids in predicting performance and selecting parameters for Nomex honeycomb sandwich panels.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Civil
Suchao Xie, Hao Wang, Kunkun Jing, Zhejun Feng
Summary: This research proposes Nomex honeycomb structures filled with carbon fibre reinforced vinyl ester resin composite tubes (NHFCT) to enhance the energy absorption capacity of Nomex honeycombs. The mechanical properties of NHFCT structures are explored through quasi-static pressure tests, finite element simulations, and a theoretical model. The results show that NHFCT structures achieve increased SEA while maintaining the energy absorption performance of Nomex honeycombs. The research also provides insights into the deformation behavior of NHFCT structures under practical application conditions.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Wei Xiao, Guangjian Peng, Haiqing Zhang, Xueting Zhang, Zhaoxia Tian, Gaojie Xu, Hui Zhang, Fenghua Liu
Summary: Carbonyl iron powder (CIP) is widely used due to its high saturation magnetization, strong wave absorption performance and low cost. However, its high density and high addition amount limit its application. In this study, a two-layer oblique honeycomb sandwich structure was designed using LCD 3D printing. This structure combines porous structure with strong absorbing materials to achieve strong electromagnetic wave absorption performance at low concentrations and improve mechanical properties.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Kanghui Song, Dawei Li, Changdong Zhang, Tingting Liu, Yunlong Tang, Yi Min Xie, Wenhe Liao
Summary: Inspired by natural hierarchical structures, this study proposes a new hierarchical honeycomb design methodology to overcome the shortcomings of conventional honeycomb structures. Through investigating the filling types, principles, and design basis of triangular, square, and circular holes at the microstructure level, a hierarchical honeycomb structure with superior mechanical properties is obtained. Simulation and experiment results show that the hierarchical honeycomb metastructures exhibit significantly improved overall mechanical properties compared with the conventional honeycomb structures, with the hierarchical honeycomb metastructures with circular holes having the best performance improvement.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Yong Zhou, Anna Liu, Yongzheng Xu, Yunli Guo, Xiaosu Yi, Yuxi Jia
Summary: This study investigates the orthotropic damping behavior and mechanism of Nomex honeycomb composites, finding that relatively high TSM and damping values can be obtained by decreasing the cell side length without adding any additional weight. The occurrence of orthotropic damping behavior is attributed to the difference in damping contributions of the interfacial phase to the honeycomb core in different directions.
THIN-WALLED STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Hua Jian, Qinrui Du, Qiaoqiao Men, Li Guan, Ruosong Li, Bingbing Fan, Xin Zhang, Xiaoqin Guo, Biao Zhao, Rui Zhang
Summary: This study fabricated bowl-like and honeycomb titanium dioxide/carbon nanotube (TiO2/CNT) composites and found that the bowl-like structure had advantages in dielectric polarization and multiple reflections, while the honeycomb structure had better impedance matching characteristics. The bowl-like composite exhibited a wide effective absorption band at 4.2 GHz and is suitable for lightweight and highly efficient electromagnetic wave absorbing materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hao Wang, Suchao Xie, Zhejun Feng, Kunkun Jing, Jing Zhang, Hui Zhou
Summary: The NHEAT, a Nomex (R) honeycomb with embedded aluminum tubes, was proposed to improve the mechanical properties and energy absorption capability. Tests and simulations demonstrated that the NHEAT can enhance mechanical properties and has a positive effect on energy absorption. The practical application of NHEAT in railway vehicle energy absorption devices showed a significant improvement of 213% in energy absorption performance.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Hongyong Jiang, Yihao Wang, Yiru Ren
Summary: Controllable energy-absorption behavior of perforated CFRP tubes can be achieved by adhesively bonding CFRP patches, effectively reducing stress concentrations and middle-height fracture to improve EA.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
Jinbo Fan, Penghui Li, Weiqi Guo, Xiuguo Zhao, Chen Su, Xinxi Xu
Summary: The flatwise compression and mechanical response of gradient-tandem Nomex honeycomb sandwich panels were investigated. Finite element models were used to evaluate the effects of layer sequences, separator materials, and layer heights on the mechanical properties. The research results show that selecting appropriate separator materials and assembly sequences can improve the response curves and reduce peak stresses of the sandwich panels.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2023)
Article
Engineering, Mechanical
Jiansong Sun, Yidan Wang, Ping Zhou, Mingye Wang, Renke Kang, Zhigang Dong
Summary: This study proposes a novel segmented material mechanical model applicable to the equivalent single-layer model, based on the analysis of the mechanical behavior of the multi-layer structure of resin-coated aramid paper. The theoretical calculation method for equivalent mechanical parameters of the multi-layer structure is also proposed. The proposed method is verified by finite element (FE) models at a micro-scale level, and simulations and experiments demonstrate its effectiveness in ultrasonic cutting for Nomex honeycomb.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Mae Oiwa, Toshio Ogasawara, Hajime Yoshinaga, Tsuyoshi Oguri, Takahira Aoki
Summary: This study aimed to establish a bending strength prediction method for a thin CFRP face sheet/Nomex honeycomb sandwich panel, with successful results using both detailed core model and solid core model. The results indicated that the solid core model is more suitable for estimating the bending strength of this sandwich panel.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Zhenhua Song, Sean Luong, Daniel Whisler, Hyonny Kim
Summary: The study investigates the effects of multi-angle impacts of ice spheres at various velocities on a sandwich panel, revealing different failure modes for honeycomb core materials and the impact of angles on pressure distribution on the face sheet of the panel. The findings show that impact angles affect the distribution of ice scatter fragments, influencing pressure distribution on the panel during impact.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Engineering, Mechanical
Wei Zhao, Ruodi Jia, Xin Li, Jian Zhao, Zonghong Xie
Summary: This study investigated the mechanical properties of Nomex (R) paper and composite Nomex (R) honeycomb sandwich structures (CNHSS) through tensile and flatwise tests, using numerical models to predict CNHSS performance and experimental results for validation. The findings suggest that CNHSS has two flatwise compressive elastic moduli, with manufacturing geometric defects having minimal impact on the ultimate compressive strength. The modified equations accurately predict the flatwise compressive buckling strength and modulus of CNHSS.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
L. Maragoni, P. A. Carraro, M. Quaresimin
COMPOSITE STRUCTURES
(2018)
Article
Engineering, Manufacturing
L. Maragoni, P. A. Carraro, M. Quaresimin
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2018)
Article
Engineering, Manufacturing
J. A. Glud, P. A. Carraro, M. Quaresimin, J. M. Dulieu-Barton, O. T. Thomsen, L. C. T. Overgaard
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2018)
Article
Engineering, Multidisciplinary
Riccardo Pietrogrande, Paolo Andrea Carraro, Matthias De Monte, Marino Quaresimin
COMPOSITES PART B-ENGINEERING
(2018)
Article
Materials Science, Composites
Francesco Panozzo, Michele Zappalorto, Lucio Maragoni, Stefan Klaus Nothdurfter, Axel Rullo, Marino Quaresimin
COMPOSITES SCIENCE AND TECHNOLOGY
(2018)
Article
Materials Science, Characterization & Testing
Oscar Castro, Paolo Andrea Carraro, Lucio Maragoni, Marino Quaresimin
Article
Engineering, Multidisciplinary
Lazaros Tzounis, Michele Zappalorto, Francesco Panozzo, Kyriaki Tsirka, Lucio Maragoni, Alkiviadis S. Paipetis, Marino Quaresimin
COMPOSITES PART B-ENGINEERING
(2019)
Article
Nanoscience & Nanotechnology
M. Monsif, A. Zerouale, N. Idrissi Kandri, R. Bertani, A. Bartolozzi, B. M. Bresolin, F. Zorzi, F. Tateo, M. Zappalorto, M. Quaresimin, P. Sgarbossa
JOURNAL OF NANOMATERIALS
(2019)
Article
Engineering, Manufacturing
L. Maragoni, P. A. Carraro, M. Quaresimin
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2019)
Article
Engineering, Mechanical
Paolo Andrea Carraro, Lucio Maragoni, Marino Quaresimin
INTERNATIONAL JOURNAL OF FATIGUE
(2019)
Article
Mechanics
Michele Zappalorto, Paolo Andrea Carraro, Riccardo Pietrogrande, Marino Quaresimin
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Multidisciplinary
L. Maragoni, G. Modenato, N. De Rossi, L. Vescovi, M. Quaresimin
COMPOSITES PART B-ENGINEERING
(2020)
Article
Materials Science, Composites
R. Pietrogrande, P. A. Carraro, M. De Monte, M. Quaresimin
Summary: The proposed criterion predicts the life to crack initiation by evaluating the effective stress in the most critical regions in the matrix, successfully considering the influence of material microstructure and load orientation.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Proceedings Paper
Engineering, Mechanical
Paolo A. Carraro, Marino Quaresimin
7TH INTERNATIONAL CONFERENCE ON FATIGUE DESIGN, FATIGUE DESIGN 2017
(2018)
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)