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
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)
Review
Mechanics
Ping Xia, Qiancheng Liu, Hua Fu, Yaping Yu, Lijuan Wang, Qingyuan Wang, Xue Yu, Feng Zhao
Summary: Bio-inspired double-layered helix honeycomb structure was successfully developed using 3D printing technique. The novel structure exhibited enhanced mechanical properties and energy absorption capability compared to regular honeycomb. The findings provide a new avenue for engineering honeycomb structures with improved performance for various applications.
COMPOSITE STRUCTURES
(2023)
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
Xiang Peng, Guoao Liu, Jiquan Li, Huaping Wu, Weiqiang Jia, Shaofei Jiang
Summary: This study introduces a novel honeycomb structure that can enhance compression property and energy absorption capacity by utilizing 4D printing technology and polylactic acid materials. The shape of the structure can be transformed under external loading and temperature stimulus. Experimental results show that the developed honeycomb structure has high compression property and energy absorption capacity, indicating broad application prospects in multifunctional honeycomb structures in the future.
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
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
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
Materials Science, Textiles
Lekhani Tripathi, Bijoya Kumar Behera
Summary: In this study, 3D woven honeycomb structures were developed with different cell geometry by varying the number of picks in the honeycomb wall. The compression energy absorption of the honeycomb composites was characterized, revealing that regular cell shape, smaller cell size, and a higher number of layers exhibited higher specific energy absorption.
JOURNAL OF INDUSTRIAL TEXTILES
(2022)
Article
Materials Science, Textiles
Rongrui Wang, Wendi Liu, Xinghai Zhou, Yuan Gao, Liwei Wu, Lihua Lyu
Summary: A double-layer honeycomb 3D woven electromagnetic wave absorbing composite was designed and prepared to address issues with delamination, low strength, and a narrow absorption frequency band. Through simulations and experiments, the absorption properties and bending properties of the composite were studied, and the absorption mechanism was elucidated. The results showed that the composite had good electromagnetic wave absorption properties and resistance to delamination, making it suitable for civil and military applications.
JOURNAL OF THE TEXTILE INSTITUTE
(2023)
Article
Engineering, Mechanical
Garam Kim, Ronald Sterkenburg
Summary: The study investigates the influence of fluid contact on the structural properties of honeycomb core in composite honeycomb sandwich structures. Test specimens were soaked in different fluids, tested for compressive strength after soaking and drying, and analyzed for the effects of aircraft fluids on Nomex (R) honeycomb core compressive strength and recovery after drying. Debonding between facesheet and core material after soaking was also examined to support the study.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
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
Materials Science, Ceramics
Zhenxue Pan, Dan Wang, Xiang Guo, Yongming Li, Zongbo Zhang, Caihong Xu
Summary: The study successfully fabricated SiCN honeycomb ceramic with excellent mechanical and microwave-absorbing properties by optimizing the ratio of multifunctional acrylates. At low temperatures, the free carbon nanodiamonds formed through the copolymerization of acrylate and polysilazane give SiCN honeycomb ceramic an extremely high microwave absorption rate.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Mechanics
Tengteng Zheng, Shuai Li, Gang Wang, Yingcheng Hu, Caiqi Zhao
Summary: The study found that the compression and short beam shear failure modes of the composite XX-type lattice sandwich structure were mainly the shear failure of the core and the failure of panels, with the sandwich structure having a core diameter of 8 mm exhibiting good compression properties. The XX (II) lattice sandwich structure combining Plywood + birch showed better compression, short beam shear, and energy absorption properties. The combination of MDF + birch was found to be more suitable for the compressive theoretical model.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(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)