Article
Materials Science, Composites
Zhouyi Li, Zhen Wang, Weibang Lu, Xi Zhou, Tao Suo
Summary: This study investigated the loading rate sensitivity of mode II fracture behavior of composites toughened by carbon nanotubes (CNTs). It was found that under quasi-static loading conditions, increasing the number of CNT layers can improve the fracture toughness of the composites, while under dynamic loading conditions, the effect of increasing CNT layers on fracture toughness is minimal.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Luohuan Zou, Yu Gong, Dingli Tian, Libin Zhao, Jianyu Zhang, Ning Hu
Summary: Delamination behavior in multidirectional laminates is affected by interface angle, and investigating the effect of interface angle on delamination behavior is crucial for practical engineering. This study analyzes the effects of interface angle on the R-curve, bridging stress, and failure mechanism through experiments and numerical simulations.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Composites
Yu Gong, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: This paper examines the effects of complex failure mechanisms on the flexural modulus of multidirectional laminates and proposes an improved data reduction method to accurately characterize fracture toughness and develop standard test procedures for mixed-mode delamination.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Mechanics
Yu Gong, Dingli Tian, Tiancheng Cao, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: In this study, a novel delamination growth criterion considering the significant R-curve effects was proposed for mixed-mode I/II delamination predictions. Its adequacy and accuracy were validated by experimental data for two different composite materials. The proposed criterion is easy to use with only two experimentally obtained parameters.
COMPOSITE STRUCTURES
(2022)
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
Engineering, Multidisciplinary
Yunfu Ou, Longqiang Wu, Xiaosu Yi, Dongsheng Mao
Summary: Ultrathin CNT fiber veils were used as interleaves to improve the interlaminar fracture toughness of carbon fiber reinforced polymer composites. The orientation of the veils greatly affected the crack propagation and the formation of carbon fiber bridgings. When oriented parallel to the carbon fiber, the veils enhanced the toughness significantly. However, when transversely-placed, the veils hindered the formation of carbon fiber bridgings and degraded the interlaminar toughness.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Polymer Science
Anran Fu, Yunfu Ou, Longqiang Wu, Yunxiao Zhang, Yiting Weng, Dongsheng Mao
Summary: This paper investigates the use of commercial free-standing carbon nanotube films to enhance the interlaminar interfaces of carbon fiber reinforced polymer composites. By pre-treating the films with acetone diluted epoxy resin solution, the degree of resin infiltration and the interlaminar fracture toughness of the composites were significantly improved. The results show that at a thickness of 5 μm, the GIC reached a maximum of 1412.42 J/m2, which is 61.38% higher than the baseline. At a thickness of 15 μm, the GIIC reached a maximum value of 983.73 J/m2, approximately 67.58% higher than the baseline.
Article
Chemistry, Multidisciplinary
Fatin Nur Amirah Mohd Sabri, Muhammad Razlan Zakaria, Hazizan Md Akil, Mohd Shukur Zainol Abidin, Aslina Anjang Ab Rahman, Mohd Firdaus Omar
Summary: The study utilized the ESD method to deposit CNTs onto the surface of GF, followed by fabricating laminated composites with enhanced fracture toughness. The hybrid CNTs-GF exhibited a 34% increase in fracture toughness compared to the control sample, with fractography revealing mechanisms such as fiber bridging and different failure modes contributing to this enhancement.
NANOTECHNOLOGY REVIEWS
(2021)
Article
Mechanics
Cheng Lin Han, Gong-Dong Wang, Nan Li, Meng Wang, Xi liang Liu, Jia he Ma
Summary: The study found that GFRP reinforced with CNTs/epoxy film had better interlaminar fracture toughness in modes I and II compared to GFRP without film and embedded with Toner/epoxy film, and the interlaminar shear strength was significantly enhanced. The impact of low-temperature cycle on the interlaminar performance of GFRP reinforced with CNTs/epoxy film was not significant, and minimal compared to other specimens.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
M. Elhadary, A. Hamdy, W. Shaker
Summary: The study investigated the extrinsic non-autonomic self-healing of composite material in two cases of crack, with and without bridging phenomena. It was found that bridging significantly increased the efficiency of crack healing, demonstrating the importance of bridging in enhancing self-healing capabilities.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Manufacturing
Yunfu Ou, Longqiang Wu, Dongsheng Mao
Summary: This study aimed to enhance the interlaminar properties of unidirectional CFRP laminates by using the synergistic effects of CNT powders and veils. By adopting short CNT powders and ultrathin CNT fiber veils, the mechanical properties and interlaminar bonding strength of the composites were effectively improved, expanding their potential applications.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Multidisciplinary
Yong-Chul Shin, Seung-Mo Kim
Summary: This study demonstrated that interleaving a carbon nanotube buckypaper in a carbon-fiber-reinforced polymer composite can significantly enhance the interlaminar fracture toughness, especially the mode II interlaminar fracture toughness which increased by 45.9%.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Manufacturing
Jun Cong Long, Hang Zhan, Guang Wu, Yu Zhang, Jian Nong Wang
Summary: A facile and effective method was proposed for preparing high-strength CNT/EP composite films, achieving a tensile strength of 2.5 GPa, which is about 5 times that of the raw CNT film. This approach may offer an effective strategy for the preparation of high-performance CNT composite materials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
T. W. Loh, R. B. Ladani, A. Ravindran, R. Das, E. Kandare, A. P. Mouritz
Summary: The addition of thermoplastic mendable filaments in z-pinned composites can greatly increase interlaminar fracture toughness, repair delamination damage, and enhance crack propagation resistance. This novel repair process has the potential application for various types of composites with through-thickness reinforcement.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Thomas W. Loh, Raj B. Ladani, Adrian Orifici, Everson Kandare
Summary: This paper presents a new multi-functional composite system that combines ultra-high interlaminar fracture toughness with exceptional repair efficiency and is seamlessly integrated into the braiding process for rapid preform manufacture. The repair agent EMAA is shown to significantly improve the interlaminar fracture toughness while enabling full recovery of fracture properties through a thermal repair process. The geometric shape and spatial distribution of EMAA strongly influence crack initiation and propagation resistance, with a new strategy developed to produce a 3D fused EMAA network for effective delivery into delamination cracks and greater than 100% recovery to steady-state fracture toughness following repair.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
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)