Article
Chemistry, Physical
Longquan Liu, Wenjun Xu
Summary: This study investigates the impact and ShAI properties of carbon fiber reinforced polymer matrix (CFRP) composite laminates using theoretical, experimental, and numerical methods. A method of determining specimen size is developed by comparing load values due to buckling and material failure. The experiments show that impact damage with a cut-off energy of 50 J results in a 26.8% reduction in residual strength.
Article
Mechanics
Tiantong Lv, Dengfeng Wang, Xuejing Du
Summary: The study focuses on the parametric modeling and design of CFRP body components for cars. The macroscale design parameters are the structural shape, while the mesoscale design parameters are the lamination schemes. A dual-scale full parametric model is developed by combining the macroscale and mesoscale parametric models. A dual-scale parametric optimization method is established to regulate the performance by switching and matching each scale parameter. The method is applied to the optimal design of a CFRP automotive roof beam, resulting in weight reduction, increased load capacity, and bending stiffness.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Hui Zhang, Jing Sun, Xiaobo Rui, Si Liu
Summary: This research focuses on developing a method for detecting and imaging delamination damage in CFRP composite laminate structures. The traditional guided wave detection methods rely on the reflected wave signal at the defect, but delamination damage often produces weak reflected wave signals compared to surface damage. The proposed method uses full-wavefield data and enhances sensitive modes in order to visualize the morphology of delamination. The method is validated through simulations and experiments.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Composites
Mostafa Moazzami, M. R. Ayatollahi, Alireza Akhavan-Safar, Sofia Teixeira de Freitas, Lucas F. M. da Silva
Summary: Moisture diffusion occurs in composite laminates when exposed to humidity, leading to a reduction in their mechanical properties, especially flexural stiffness, which is important in design. This research investigates the mechanical properties of CFRP and GFRP composites as a substrate in adhesive joints under cyclic wet/dry aging conditions for long-term structural applications. The results show that the reduction in flexural stiffness is more severe in CFRP laminates compared to GFRP laminates, indicating the suitability of GFRP laminates for ocean applications.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Emre Erbil, Ramazan Karakuzu
Summary: This study tested a unique assembly method using carbon fiber-reinforced plastic sleeves to improve the load-carrying capacity of single-lap joints. Advanced techniques were used to simulate the progressive degradation behavior of the material, resulting in significant improvements in failure indices, damage initiation force, and inter-plate clamp load.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Scott L. J. Millen, Brian G. Falzon, M. Ali Aravand
Summary: Invariant based approaches have been extended to woven and hybrid composites, with a novel method proposed for Tsai's Modulus implementation and determination of the three-dimensional stiffness matrix of woven specimens, showing their potential as initial design tools.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Composites
Yunyu Li, Tianshu Chu, Shuyan Shi, Longfan Peng, Jing Chen, Qian Liang, Xiwei Guo
Summary: Comprehensive experiments were conducted to investigate the stress-strain relationship of carbon-fiber/epoxy steel composite laminate (CSL) under monotonic tensile and cyclic tensile. The results showed stable post-yield modules and minimal residual deformation in the CSL curves. Theoretical models, numerical simulations, and experimental validation were performed to analyze the mechanical performance of CSL under varying steel volume fractions (SVF), including absorption and energy dissipation coefficients.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Mechanics
Noemie Fedon, Paul M. Weaver, Alberto Pirrera, Terence Macquart
Summary: Composite materials are commonly used for designing lightweight structures due to their high specific strength and stiffness, but the anisotropy of composites can lead to complex failure mechanisms. Existing design guidelines are difficult to enforce, often requiring post-repair to meet requirements. The authors propose a deterministic repair procedure with a success rate of over 88% and fast computational speed.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Aerospace
Bing Shen, HongJun Liu, Shengli Lv, Zheng Li, Wen Cheng
Summary: This investigation focused on studying the performance degradation mechanisms of CRRP composite materials in a solar UAV structure under acid rain conditions. Through aging tests involving immersion in deionized water and acidic solutions, it was found that the composite materials exhibited different characteristics, with moisture absorption and flexural strength decreasing under hygrothermal conditions, and deviating behavior and greater strength reduction under acidic conditions. SEM analysis revealed that corrosion of the polymer matrix and fiber/matrix interface debonding were key factors in the performance degradation of the materials.
INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Lijian Zeng, Wenwu Tao, Junjie Zhao, Yichao Li, Renfu Li
Summary: This study investigates the effects of a bio-surfactant gelatin-modified carbon nanotubes on the fiber interfacial property and matrix performance of carbon fiber-reinforced polymer composites. The results showed that the modified carbon nanotubes significantly improved the fiber/matrix interface strength and flexural properties of the composites, providing a basis for the development of advanced carbon nanotube-reinforced composites.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Mechanics
Thanh N. Huynh, Jaehong Lee
Summary: This article presents a two-stage optimization approach for finding optimal blended composite laminate designs by predicting the optimal thickness distribution. By predicting the optimal thicknesses, the method simplifies the blending optimization problem and improves the combinatorial optimization efficiency.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Bruno Vermes, Stephen W. Tsai, Aniello Riccio, Francesco Di Caprio, Surajit Roy
Summary: By utilizing Tsai's modulus and double-double design for composites, it is possible to simplify the design process in a way similar to metals, achieving lighter, cheaper, and more structurally tailored solutions for specific loading conditions.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Jun Hong, Ping Xu, Hong Xia, Zhenzhen Xu, Qing-Qing Ni
Summary: The research confirmed the anisotropy of EMI shielding performance of CFRP composites using the coaxial transmission line method, with the orientation of fibers directly affecting the shielding effectiveness. Results showed that structures with multiple cross-layers had a significant impact on EMI shielding performance, outperforming structures with fibers aligned in the same direction.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Arturo Abundez-Pliego, Oscar Fernando Oliveros-Riego, Joel C. Huegel, Enrique Alcudia-Zacarias, Jose Antonio Arellano-Cabrera, Jan Mayen
Summary: A mathematical model is proposed in this study to estimate the damage accumulation in CFRP composite based on two design variables: stacking sequence and fiber orientation. The model is validated by comparing the results with those previously reported in the literature, and it is found to accurately predict the fatigue damage accumulation based on the laminate design variables, eliminating the need for additional fatigue tests.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Yu Gao, Shiyang Zhu, Huiming Ding, Xiaowen Song, Huanyi Hu, Han Wang, Yinglin Ke
Summary: As ultra-thick laminates are extensively used in aerospace and marine applications, understanding the effect of thickness on their compressive properties is crucial. This study investigates the influence of parameters such as fiber volume fraction, fiber waviness, void content, and free edge effect on the compressive strength of ultra-thick laminates. The results indicate that the fiber volume fraction remains relatively unchanged with increasing thickness, while fiber waviness, void content, and free edge stress significantly influence the compressive strength. Furthermore, the study proposes an empirical relationship between compressive strength and thickness, providing important theoretical and experimental references for the design of ultra-thick composite structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
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)