Article
Engineering, Electrical & Electronic
Keijiro Yoshimura, Kazunori Nakano, Takeshi Nishiwaki, Yuki Iwama, Masanobu Murata
Summary: This study developed strain sensor materials with electrical resistivities changing with strain by producing Ketjenblack/silicone-rubber composites with gradually changing pore sizes. The results showed that the resistivities of the graded porous composites decreased more significantly at high compression rates, making them promising strain sensor materials. The changes in resistivity were attributed to a gradual increase in size of the area with low resistivity, indicating the potential for use under high compression rates.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Mechanics
Mohammad Hossein Zamani, Mohammad Heidari-Rarani, Keivan Torabi
Summary: This paper presents a novel graded design for an auxetic honeycomb sandwich structure, and the mechanical properties are improved through experiments and numerical analysis.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Mi Xiao, Xiliang Liu, Yan Zhang, Liang Gao, Jie Gao, Sheng Chu
Summary: Graded lattice sandwich structures (GLSSs) can achieve superior structural performances through continuously-varying lattice configurations and properties in space. This study introduces a design method using multiscale topology optimization, reducing computational burden and ensuring manufacturability. Numerical examples and bending tests demonstrate that GLSSs are stiffer and have larger natural frequencies compared to uniform lattice sandwich structures.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Meiling Fan, Tao Zeng, Rina Wu, Yuhua Cui, Guodong Xu, Xiaohong Wang, Su Cheng, Jue Zhao
Summary: This study proposes a novel sandwich structure with graded lattice core, achieving gradient design using tailored porosity. An analytical model is developed to determine the compression response of the graded lattice core in the sandwich structures. Two types of graded lattice sandwich structures are fabricated and compression tests are conducted to validate the analytical model. The results show good agreement between the analytical predictions and experimental outcomes. It is found that the effective Young's modulus is independent of porosity distribution pattern but dependent on porosity parameter and power law index. Moreover, increasing porosity parameter leads to decreased yield stress and critical buckling stress. The structure with SCI porosity distribution pattern exhibits superior load-bearing capabilities, indicating that desirable mechanical properties can be achieved through controlled structural porosity.
COMPOSITE STRUCTURES
(2023)
Review
Polymer Science
S. Alsubari, M. Y. M. Zuhri, S. M. Sapuan, M. R. Ishak, R. A. Ilyas, M. R. M. Asyraf
Summary: The interest in using natural fiber reinforced composites and sandwich structures is high due to their environmental benefits and improved performance. While there is still room for further application and improvement, integrating composite materials into sandwich structures can enhance performance and be applied in various engineering fields.
Article
Computer Science, Interdisciplinary Applications
Andrew Akerson, Blaise Bourdin, Kaushik Bhattacharya
Summary: With recent advances in responsive materials and fabrication techniques, integrated functional structures composed of structural and active materials can now be constructed. This study investigates the robust design of such structures through topology optimization, exploring different objective functions and their resulting designs.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2022)
Article
Polymer Science
Pooria Khalili, Mikael Skrifvars, Hom Nath Dhakal, Saeid Hosseinpour Dashatan, Mikael Danielsson, Alexia Feiner Gracia
Summary: Sandwich composites consisting of regenerated cellulose fabric and bio-based polypropylene as facings, as well as virgin and recycled polyamide textiles as core materials, were produced using compression moulding techniques. The addition of thicker recycled textile improved the bending stiffness and peak flexural force. Substituting one layer of recycled textile for two layers of virgin material provided good impact energy absorption capacity and maximum force. Tensile strength varied among the different composite materials, but no evidence of fiber tow debonding, fiber bundle splitting, or delamination was observed.
Article
Forestry
Dongxia Yang, Changsheng Fan
Summary: This paper studies the mechanical properties of wood-based sandwich structures and finds that the apparent density of the structures is lower but the overall flat compressive strength is higher. The design of the core layer plays a significant role in the mechanical properties and failure modes of the structures.
Article
Engineering, Aerospace
Zehao Cui, Zhijin Wang, Feng Cao
Summary: A folded core is a three-dimensional structure formed by folding a flat sheet of paper, which has excellent mechanical properties and light weight. This article investigates the equivalent mechanical properties of the V-type folded core and verifies their reliability through a case study. The application of analytical solutions can simplify and speed up the optimization process of VFC, which is of great engineering significance to aircraft design.
Article
Computer Science, Interdisciplinary Applications
Aytac Arikoglu
Summary: Optimal design of two-dimensional functionally graded thick flywheels was achieved using GDQM and NSGA II, with results compared to open literature and ANSYS solutions showing good agreement. Pareto optimal solutions for minimum mass and maximum energy storage capability were obtained, leading to the determination of optimal cross-section geometry and material distribution of FG flywheels.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2021)
Review
Materials Science, Composites
Vivek Patekar, Kishor Kale
Summary: Sandwich composite structures are widely used in various industries due to their high specific strength and energy absorption capabilities. The mechanical properties of these structures depend on the material properties of the face sheet, core, and their interface. Researchers have explored the use of nano-fillers to improve the mechanical properties of composite structures. This review discusses the influence of various material and geometrical parameters, such as fiber reinforcement and nano-fillers, on the mechanical properties of sandwich composite structures. Additionally, the deformation behavior and mechanical properties of the honeycomb core, as well as the effect of temperature variation, are discussed. Future advancements in this field are also explored.
POLYMER COMPOSITES
(2022)
Article
Mechanics
Zhicheng Huang, Mengna Han, Xingguo Wang, Fulei Chu
Summary: This paper proposes a new analysis model for functionally graded material (FGM) porous sandwich plates with only four variables considering pores. It is applied to the nonlinear bending of two different types of FGM porous sandwich plates under mechanical loading and compares their bending characteristics. The governing equations are obtained using the principle of virtual work, and the Navier method is employed to solve the simply supported FGM porous sandwich plates. The obtained numerical results are compared with literature to validate the accuracy of the theory. The effects of various factors on the mechanical bending properties of FGM porous sandwich plates are studied in detail, providing valuable guidance for their design.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Agricultural Engineering
Xiaoyan Li, Wencheng Lei, Zhenhua Zhang, Weizhong Zhang, Neng Li, Yuxiang Yu, Chao Li, Yuhe Chen, Fei Rao
Summary: A low-cost, easy-to-process, and sustainable multilayer composite structural material was developed using byproduct cork granules, bamboo bundles, and bamboo veneers. The material showed superior tensile strength and dimensional stability, with the tensile strength increased 4.8-fold by the addition of bamboo veneer. This lightweight, low-cost, renewable, and high-performance cork-bamboo composite is suitable for various decorative and structural applications.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Materials Science, Multidisciplinary
Hirak Kansara, Mingchao Liu, Yinfeng He, Wei Tan
Summary: Shape-morphing structures have the ability to change shape, making them suitable for various applications. This paper proposes a new inverse design strategy using functionally graded composites (FGCs) to modify bending stiffness and achieve desired shapes. By using a multi-material 3D printer, FGC-based shape-morphing structures with different curvatures were successfully fabricated and validated. The framework also demonstrates the versatility of using modulus-graded composites in various applications. Overall, this research provides an important contribution to the field of shape-morphing structures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Marine
Yu Qiu, Wei Shen, Renjun Yan, Xiaobin Li, Zhenzhou Ye, Mengzhen Li, Kang Liu, Kai Qin
Summary: This paper develops theoretical and numerical calculation methods to better predict the characteristics of bimodal sandwich composites, which is significant for structural design and safety check of marine sandwich composites.
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)