Article
Mechanics
Kenji Asakawa, Yoshiyasu Hirano, Kwek-Tze Tan, Toshio Ogasawara
Summary: In this study, a biomimetic approach is used to determine the arrangement of stiffeners in stiffened composite panels by utilizing Voronoi diagrams. An optimization algorithm combining genetic algorithm and finite element method is developed to optimize the position of generator points in the Voronoi diagram for buckling under compression and shear load. The results demonstrate that the optimized panel with periodical stiffener shapes designed using Voronoi diagrams has a higher buckling load compared to conventional panels, indicating the effectiveness of this biomimetic design approach for stiffened CFRP panel structures.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Salih Alan, Nefize Shaban, Gullu Kiziltas Sendur, Bekir Bediz
Summary: In this study, a novel optimization framework was proposed, which combines a highly accurate and computationally efficient spectral element modeling technique with an index-based optimization approach that satisfies manufacturing guidelines and empirical rules. The accuracy and computational performance of the proposed framework were demonstrated in composite laminates, and its capability and efficiency were shown in various stiffened composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Sheng Zhang, Chenyang Liu, Xu Zhang, Jinkang Du, Qiang Chen, Xiguang Gao, Yingdong Song
Summary: A performance analysis method for mesoscopic aperiodic ceramic matrix composite structures is developed and applied to the strength calculation of 2.5D SiC/SiC variable thickness dovetail joint structures. The established model accurately describes the structure's real yarn geometries and orientations, and the simulated results are in good agreement with experimental data.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Multidisciplinary
Jingjing Wang, Yan Li, Qian Li, Yu Long, Tao Yu, Zhuo Li
Summary: This study investigates the evolution of stiffness in flax yarn within flax fiber reinforced composites (FFRCs) during moisture absorption and focuses on the influence of moisture content on the microstructure of flax fibers. The study reveals that the microfiber angle (MFA) in the S2 layer is the most crucial parameter affecting the longitudinal elastic properties of flax yarn in FFRCs, while the stiffness degradation of the combined amorphous matrix (CAM) significantly influences the transverse elastic properties. Finally, the study establishes a relationship between the overall stiffness of flax yarn in FFRCs and the relative moisture content (RMC).
COMPOSITES PART B-ENGINEERING
(2024)
Article
Mechanics
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. V. Krishnamurthy, Krishnan Balasubramaniam
Summary: In the field of non-destructive testing of composite materials, induction thermography shows great potential. This study proposes a novel methodology to inspect UD CFRP composites using Induction Thermography, by incorporating an additional conduction current loop between the composite layers. The integration of a global current path notably enhances the induction thermographic inspection capability, and a circular coil demonstrates high sensitivity in detecting fiber breakage in a laminate.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(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
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
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
Engineering, Multidisciplinary
Tingting Zhang, Jingbin Zhang, Jun Chang, Wanli Bi, Chris Cheeseman, Xiaoyang Chen
Summary: This study reported the effect of silicic acid on the hydration and strength development of magnesium oxysulfate cement containing citric acid. The presence of silicic acid promoted the hydration rate, reduced the setting time, and increased the compactness of the cement.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Wen Zheng, Bo Liu, Chenhui Yang, Aibo Zhang
Summary: A novel flexible microwave absorbing material with a cone-shaped sandwich structure has been proposed, which shows impressive broadband absorption properties. The experimental and simulation results are in good agreement, confirming the accuracy and feasibility of the method. The investigation also demonstrates the material's adsorption retention rate in saline solution.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Mechanics
Yong-Jian Cai, Zhi-Hong Xie, Shu-Hua Xiao, Ze-Run Huang, Jia-Xiang Lin, Yong-Chang Guo, Ke-Xian Zhuo, Pei-yan Huang
Summary: Steel-fiber reinforced polymer (FRP) composite bar (SFCB) is a promising reinforcement material for improving the service life of marine structures due to its advantages of corrosion resistance of FRP and good ductility of steel. This study investigates the fatigue behavior of SFCB through fatigue tests and proposes a residual strength prediction model, contributing to the understanding and design of SFCBs.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Kaiyu Wang, Jiaxin Chen, Kai Wei, Rong Wang, Xujing Yang
Summary: This article introduces a metamaterial that combines customizable coefficient of thermal expansion (CTE) with high mechanical performance, and discusses its thermal expansion and mechanical characteristics in detail. Through experiments and analysis, it is found that the programmable thermal expansion and mechanical performance can be achieved by adjusting the geometrical parameters, thus meeting different application requirements.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Cong Zhang, Hui Qiao, Lei Yang, Wu Ouyang, Tao He, Bing Liu, Xiyong Chen, Nannan Wang, Chunze Yan
Summary: This study compares the conventional strut-based lattice structures with the new TPMS lattice structures and finds that TPMS lattice structures have better mechanical properties and vibration isolation properties.
COMPOSITE STRUCTURES
(2024)
Letter
Mechanics
Zhenbo Wu, Tian Zhao, Chunwang He, Haitao Liao, Ying Li
Summary: This paper proposes a novel method to optimize the fiber path of carbon fiber-reinforced polymer composites using genetic algorithms and simulated annealing algorithms combined with quasi-uniform cubic B-spline curves. The optimization goal is to obtain the largest reaction force and reduce stress concentration. By reducing the number of optimization variables and increasing the interval variables of the B-spline curve, the computational efficiency and accuracy of the optimization results are greatly improved. The comparison of the optimization results between genetic algorithms and simulated annealing algorithms shows that the latter has better convergence speed and accuracy.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
E. Komurcu, A. Kefal, M. A. Abdollahzadeh, M. F. Basoglu, E. Kisa, M. Yildiz
Summary: This study focuses on redesigning and manufacturing automotive suspension control arms using composite materials to decrease weight and increase strength. Innovative mechanical simulation methods and optimization algorithms are employed to determine the optimal laminate stacking sequence, which is verified through experimental testing. The study highlights the advantages of the design-analysis-optimization strategy for manufacturing automobile parts from composite materials.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yu Chen, Chuntao Zhang
Summary: This study analyzed the mechanical properties and stability of pultruded basalt fiber-reinforced polymer (BFRP) tubes under compressive axial loading. It found that short BFRP tubes have high compressive strength and elastic modulus, and observed three different compressive failure modes. Furthermore, two design-oriented theoretical models and a stability equation were proposed for predicting the behavior of BFRP tubes.
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)
