欧云福
@nimte.cas.cn
Key Laboratory of Marine Materials and Related Technologies
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
EDUCATION
10/2016-12/2020 Ph.D. in Mechanical/Structural Engineering
• IMDEA Materials Institute & Polytechnic University of Madrid
• Thesis: “Hybrid FRP/CNT veil hierarchical composite with enhanced interlaminar properties and integrated multifunctionalities” (el Premio Extraordinario de Doctorado)
09/2013-06/2016 Master in Structure engineering and Building materials
• College of Civil Engineering, Hunan University, Hunan, Changsha, China
• Thesis: “Research on multi-scale mechanical properties of basalt fiber reinforced plastic”
(Excellent master's thesis of Hunan Province)
09/2009-06/2013 Bachelor in Agricultural Structure Environment and Energy Engineering
• College of Water Conservancy & Civil Engineering, China Agricultural University, Bejing, China
RESEARCH, TEACHING, or OTHER INTERESTS
Materials Science, Polymers and Plastics, Mechanics of Materials, Civil and Structural Engineering
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Hongchen Zhao, Yunxiao Zhang, Yunfu Ou, Longqiang Wu, Juan Li, Xudan Yao, Xiongwu Yang, and Dongsheng Mao
MDPI AG
“Interleaving” is widely used for interlaminar toughening of fiber-reinforced composites, and the structure of interleaving is one of the important factors affecting the toughening efficiency of laminates. Several experiments have demonstrated that compared to continuous and dense structures, toughening layers with structural heterogeneity can trigger multiple toughening mechanisms and have better toughening effects. On this basis, this work further investigates the application of heterogeneous toughening phases in interlaminar toughening of bidirectional GFRP. CNT was selected to construct toughening phases, which was introduced into the interlaminar of composites through efficient spraying methods. By controlling the amount of CNT, various structures of CNT toughening layers were obtained. The fracture toughness of modified laminates was tested, and their toughening mechanism was analyzed based on fracture surface observation. The results indicate that the optimal CNT usage (0.5 gsm) can increase the initial and extended values of interlayer fracture toughness by 136.0% and 82.0%, respectively. The solvent acetone sprayed with CNT can dissolve and re-precipitate a portion of the sizing agent on the surface of the fibers, which improves the bonding of the fibers to the resin. More importantly, larger discrete particles are formed between the layers, guiding the cracks to deflect in the orientation of the toughened layer. This generates additional energy dissipation and ultimately presents an optimal toughening effect.
Yunxiao Zhang, Yunfu Ou, Longqiang Wu, Anran Fu, Yiting Weng, and Dongsheng Mao
Elsevier BV
Yunfu Ou, Hongchen Zhao, Juan Li, and Dongsheng Mao
Elsevier BV
Zhaojing Li, Mengjie Wang, Yanchen Liu, Lijuan Cai, Jiayi Fan, Yunfu Ou, Lingzhuang Zhu, He Li, and Dongsheng Mao
Wiley
AbstractIn this study, aramid fiber (AF)/phenolic resin prepreg was fabricated by impregnating low content carbon nanotube (CNT)‐reinforced phenolic resin with aramid fabric through a two‐roll pressing process. Both non‐functionalized and carboxylic‐functionalized CNTs (CNTs and CNTs‐COOH) were used for comparison study. For each of the formulations, composite laminate was made by a hot‐pressing process with a number of the prepregs stacked together. Mechanical properties and ballistic performance of the laminates and material failure mechanisms were evaluated and analyzed. Both non‐functionalized and CNTs‐COOH can effectively improve the mechanical and ballistic performance of the laminates. With CNTs‐COOH reinforcement, better results were achieved. As compared with the laminate without CNT reinforcement, 1.0 wt% CNTs‐COOH‐reinforced laminate showed 19.41%, 22.29%, and 45.83% improvement in tensile, flexural, and adhesion shear strength, respectively. The ballistic test results showed that the V50 and the specific energy absorption (SEA) were increased by 5.77% and 13.44%, respectively. The correlation between mechanical and ballistic performance of the composites was analyzed and conducted.
Yunfu Ou, Anran Fu, Longqiang Wu, Xiaosu Yi, and Dongsheng Mao
Elsevier BV
Anling Li, Deju Zhu, Barzin Mobasher, Yunfu Ou, and Shuaicheng Guo
American Society of Civil Engineers (ASCE)
Anran Fu, Yunfu Ou, Longqiang Wu, Yunxiao Zhang, Yiting Weng, and Dongsheng Mao
MDPI AG
Carbon fiber reinforced polymer composites have the advantages of being lightweight, having high strength and designability, and having been extensively used. However, the interlaminar toughness and delamination resistance of these composites are relatively poor due to their laminated structure and intrinsic brittleness of resin matrix. In this paper, commercialized free-standing carbon nanotube (CNT) films, drawn from CNT forests, were used to toughen the interlaminar interfaces of the composites. The effects of resin infiltration state and thickness of CNT films on the interlaminar toughening effect were systematically investigated. The results show that the pre-infiltration treatment of CNT films with acetone diluted epoxy resin solution can effectively improve the degree of resin infiltration. Compared with the samples containing untreated CNT film, the Mode I and Mode II interlaminar fracture toughness of the treated samples were significantly improved. The GIC reached a maximum of 1412.42 J/m2 at a CNT film thickness of 5 µm, which was about 61.38% higher than that of the baseline. At a CNT film thickness of 15 µm, the GIIC reached a maximum value of 983.73 J/m2, approximately 67.58% higher than that of the baseline. The corresponding toughening mechanisms were also systematically analyzed.
Mengjie Wang, Jianfang Yong, Lijuan Cai, Zhaojing Li, Yunfu Ou, Lingzhuang Zhu, Xiaosu Yi, and Dongsheng Mao
Elsevier BV
Guangyan Feng, Yunfu Ou, Md Zillur Rahman, Linlin Zhou, Hongchen Zhao, Qingling Chen, Dongsheng Mao, and Deju Zhu
Elsevier BV
Yiting Weng, Longqiang Wu, Yunfu Ou, and Dongsheng Mao
Elsevier BV
Yunfu Ou, Longqiang Wu, and Dongsheng Mao
Elsevier BV
Yunfu Ou, Longqiang Wu, Xiaosu Yi, and Dongsheng Mao
Elsevier BV
Yunfu Ou, Longqiang Wu, Meir Hefetz, Carlos González, and Juan José Vilatela
Elsevier BV
Yunfu Ou, Moumita Rana, Juan José Vilatela, and Carlos González
Elsevier BV
Azzam Ahmed, Md Zillur Rahman, Yunfu Ou, Sai Liu, Barzin Mobasher, Shuaicheng Guo, and Deju Zhu
Elsevier BV
L. Zhang, Y. Ou, and D.-Y. Wang
Department of Polymer Engineering, Scientific Society of Mechanical Engineering
Yunfu Ou, Carlos González, and Juan José Vilatela
Elsevier BV
Hang Li, Sai Liu, Gaosheng Li, Yiming Yao, Caijun Shi, Yunfu Ou, and Deju Zhu
American Society of Civil Engineers (ASCE)
AbstractThe flexural behavior of basalt textile-reinforced concrete (BTRC) with and without pretension and with one of two types of short fibers was investigated using an instrumental four-point be...
Yunfu Ou, Carlos González, and Juan José Vilatela
Elsevier BV
Moumita Rana, Yunfu Ou, Chenchen Meng, Federico Sket, Carlos González, and Juan J Vilatela
IOP Publishing
A natural embodiment for multifunctional materials combining energy-storing capabilities and structural mechanical properties are layered structures, similar to both laminate structural composites and electrochemical energy-storage devices. A structural composite with integrated electric double layer capacitive storage is produced by resin infusion of a lay up including woven glass fabric used as mechanical reinforcement, carbon nanotube non-woven fabrics as electrodes/current collectors and a polymer electrolyte. The energy-storing layer is patterned with holes, which after integration form resin plugs for mechanical interconnection between layers, similar to rivets. Finite element modelling is used to optimise rivet shape and areal density on interlaminar shear properties. Galvanostatic charge-discharge tests during three-point bending show no degradation of properties after large deflections or repeated load/unload cycling at 3.5 V. This mechanical tolerance is a consequence of the elimination of metallic current collectors and the effective integration of multifunctional materials, as observed by electron microscopy and x-ray computed tomography. In contrast, control samples with metallic current collectors, analogous to embedded devices, rapidly degrade upon repeated bending.
Evgeny Senokos, Yunfu Ou, Juan Jose Torres, Federico Sket, Carlos González, Rebeca Marcilla, and Juan J. Vilatela
Springer Science and Business Media LLC
AbstractThis work presents a method to produce structural composites capable of energy storage. They are produced by integrating thin sandwich structures of CNT fiber veils and an ionic liquid-based polymer electrolyte between carbon fiber plies, followed by infusion and curing of an epoxy resin. The resulting structure behaves simultaneously as an electric double-layer capacitor and a structural composite, with flexural modulus of 60 GPa and flexural strength of 153 MPa, combined with 88 mF/g of specific capacitance and the highest power (30 W/kg) and energy (37.5 mWh/kg) densities reported so far for structural supercapacitors. In-situ electrochemical measurements during 4-point bending show that electrochemical performance is retained up to fracture, with minor changes in equivalent series resistance for interleaves under compressive stress. En route to improving interlaminar properties we produce grid-shaped interleaves that enable mechanical interconnection of plies by the stiff epoxy. Synchrotron 3D X-ray tomography analysis of the resulting hierarchical structure confirms the formation of interlaminar epoxy joints. The manuscript discusses encapsulation role of epoxy, demonstrated by charge-discharge measurements of composites immersed in water, a deleterious agent for ionic liquids. Finally, we show different architectures free of current collector and electrical insulators, in which both CNT fiber and CF act as active electrodes.
Sai Liu, Deju Zhu, Yunfu Ou, Yiming Yao, and Caijun Shi
Elsevier BV