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
Jun Wu, Xuebing Xu, Cheng Liu, Chao Deng, Xinyu Shao
Summary: Carbon fiber reinforced plastics composites are widely used in aerospace and automotive industries for their superior performance. Due to their high degree of anisotropy, detecting internal damage in these composites is challenging. This paper proposes a novel method combining deep convolutional neural network and continuous wavelet transform for precise diagnosis and positioning of delamination damage.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Manufacturing
Hamed Fallahi, Ozge Kaynan, Amir Asadi
Summary: This study experimentally investigates the influence of the fiber-matrix interphase on the fracture toughness of fiber-reinforced composites. The width and chemical properties of the interphase zone are found to significantly affect the interfacial strength. By modifying the fiber surface with nanoparticles, the interfacial strength is improved by 76%, resulting in a more effective contribution of the matrix during fracture. This stronger interphase leads to a 183% improvement in mode I and 75% improvement in mode II interlaminar fracture toughness of the composite.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
Yang Zhao, Menglin Zhao, Anyang Wang, Zhengping Chang, Zhongqi Wang, Ke Zhang
Summary: Despite decades of development, delamination damage in multidirectional laminates remains a significant issue in industrial field. This study introduces a triepoxy into an existing epoxy system to synthesize a self-healable vitrimer, which improves its mechanical properties and Tg, providing significant guidelines for engineering applications.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Construction & Building Technology
H. N. Yoon, Daeik Jang, Taegeon Kil, H. K. Lee
Summary: This study examined the changes in electrical properties of cement pastes incorporating CNT and CF exposed to various deterioration factors. The electrical resistivity of the samples increased with exposure time, and a rapid change in resistivity due to the polarization effect was observed. However, the incorporation of micro-sized CF mitigated the increase in resistivity caused by deterioration, improving electrical stability in different environments. Exposure to deterioration conditions caused changes in physicochemical structures and resulted in changes in electrical resistivity.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Ting Luo, Huikai Yuan, Qiang Wang
Summary: This study investigates the differences of carbon fiber (CF) on the properties of Portland cement and alkali-activated fly ash/slag (AAFS) pastes. The workability, rheological performance, and electrical properties of CF-based AAFS were analyzed and compared with CF-based cement paste. The electrical microstructure of CF composites was analyzed by electrical impedance spectroscopy (EIS). The results show that AAFS-CF composite has better CF dispersion and electrical conductivity compared to cement due to the higher plastic viscosity and the softening effect of alkaline activator.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Physical
Rinto Roy, Marco Gherlone
Summary: This work presents a novel strategy that uses surface-instrumented strain sensors for detecting and localizing damages in composite structures. The strategy relies on real-time reconstruction of structural displacements using the inverse Finite Element Method (iFEM). The iFEM reconstructed displacements or strains are processed to establish a real-time healthy structural baseline, making prior information unnecessary. The approach is demonstrated on carbon fiber-reinforced epoxy composite structures, showing reliability and robustness but highlighting the importance of sensor proximity to accurately predict damages.
Article
Construction & Building Technology
Mengyuan Lu, Huigang Xiao, Min Liu, Jianhua Feng
Summary: It has been proposed an effective fiber modification method, which enhances the mechanical properties. A thin SiO2 layer was formed on carbon fiber surface through the condensation and polymerization of tetraethyl orthosilicate under alkaline conditions, which can react with Ca(OH)2 to form calcium silicate hydrate and condense the fiber-matrix interface. Nano-SiO2 modified carbon fibers were produced and the mechanical properties of modified carbon fiber reinforced cementitious composites were investigated. The modified material exhibited significant enhancements in flexural strength and tensile strength, as well as improved post-crack behavior and toughness properties due to the denser microstructure of fiber-matrix interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Ji-Hua Zhu, Haowei Shen, Liangliang Wei
Summary: This study investigates the electrical properties and fracture behavior of cementitious composites HyFRCC, which consist of polyethylene (PE) and carbon fiber (CF). An orthogonal experimental design was used to evaluate the effect of water-to-binder ratio and volume fraction of fibers on the properties of HyFRCC. The results show that the water-to-binder ratio significantly affects the electrical resistivity, while CF affects the initial fracture toughness and PE determines the unstable fracture toughness. By selecting the appropriate fiber system and water-to-binder ratio, HyFRCC can achieve compatible electrical properties and fracture behavior.
STRUCTURAL CONCRETE
(2023)
Article
Engineering, Mechanical
Yumin An, Mingyao Song, Kun Wan, Yongna Jia, Yi Yang, Yehong Cheng
Summary: The anisotropic friction properties of biomimetic Cf/ZrB2-SiC ceramic composites with fibers disposed along Bouligand structures are analyzed. The friction properties parallel to and vertical to the hot-pressing surfaces are analyzed for the Cf/ZrB2-SiC ceramic composites with different carbon fiber contents. The anisotropic friction properties of biomimetic Cf/ZrB2-SiC ceramic composites with Bouligand structures under high speed and wet conditions are also explored. This paper provides a good reference for analyzing the anisotropic friction properties of ceramic composites with Bouligand structures.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Shunqi Mei, Jian Wang, Jitao Wan, Xichun Wu
Summary: Carbon-based nano-conductive silicone rubber with carbon fiber, graphene and carbon nanotubes as fillers was prepared via solution blending. The results showed that the carbon fiber conductive silicone rubber had a volume resistivity of 9.5 x 10(4)Omega cm and a surface resistance of 2.88 x 10(5)Omega, while the graphene conductive silicone rubber had a volume resistivity of 8.7 x 10(4)Omega cm and a surface resistance of 2.4 x 10(6)Omega. The carbon nanotube conductive silicone rubber had a volume resistivity of 1.34 x 10(4)Omega cm and a surface resistance of 1.0 x 10(6)Omega. The blended carbon nano-conductive silicone rubber exhibited enhanced conductivity and stability due to the formation of a stable three-dimensional composite conductive network.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Multidisciplinary
Song Lu, Wei Xia, Erlei Bai, Liyun Ling, Yuhang Du
Summary: The study focused on modifying the interfacial characteristics between carbon fiber and matrix by grafting carbon nanotubes onto the surface of carbon fiber to enhance the dynamic compression properties of concrete. The results showed that CNTs-CF improved the toughness of the internal F/M interface of concrete, relieving local stress concentration and enhancing dynamic compression properties.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Mathias Haingartner, Sandra Gschossmann, Max Cichocki, Martin Schagerl
Summary: This article introduces a new current injection pattern for electrical impedance tomography, which improves hole detection quality in carbon fiber reinforced polymer plates and allows for delamination detection. The advantages of the new pattern are demonstrated through numerical finite element analyses and experimental validation.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Multidisciplinary
Sarath P. Kumar, Karingamanna Jayanarayanan, Meera Balachandran
Summary: This study focuses on the development and performance comparison of carbon fiber (CF)-poly-aryletherketone (PAEK) thermoplastic laminates prepared using CF treated with plasma, multi-walled carbon nanotubes (MWCNT), graphene, acid, and rare earth elements. Surface-treated CF showed improved wettability and lower contact angle. Plasma-treated PAEK-CF composites exhibited superior mechanical properties due to better interfacial adhesion between CF and PAEK.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Composites
Yun Wan, Changfu Tang, Zhiyuan Jiang, Fangxin Wang, Chaojie Hu, Bin Yang
Summary: This paper investigates the application of shape memory alloy (SMA) in carbon fiber-reinforced polymer (CFRP) T-shape structures. Through tensile tests, the enhancing laws and reinforcement mechanisms are revealed. The roles of SMA in adhesive repair of permanent damage in T-joints are analyzed. Overall, SMA's advantages of super-elasticity and shape memory are utilized to improve the mechanical properties and adhesive repair of CFRP T-joints.
COMPOSITES COMMUNICATIONS
(2023)
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
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)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(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)