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Wu, Jingyu,Lan, Chengming,Xian, Guijun,Li, Hui Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.4
Carbon fiber reinforced polymer (CFRP) cable has good mechanical properties and corrosion resistance. However, the anchorage of CFRP cable is a big issue due to the anisotropic property of CFRP material. In this article, a high-efficient bonding anchorage with novel configuration is developed for CFRP cables. The acoustic emission (AE) technique is employed to evaluate the performance of anchorage in the fatigue test and post-fatigue ultimate bearing capacity test. The obtained AE signals are analyzed by using a combination of unsupervised K-means clustering and supervised K-nearest neighbor classification (K-NN) for quantifying the performance of the anchorage and damage evolutions. An AE feature vector (including both frequency and energy characteristics of AE signal) for clustering analysis is proposed and the under-sampling approaches are employed to regress the influence of the imbalanced classes distribution in AE dataset for improving clustering quality. The results indicate that four classes exist in AE dataset, which correspond to the shear deformation of potting compound, matrix cracking, fiber-matrix debonding and fiber fracture in CFRP bars. The AE intensity released by the deformation of potting compound is very slight during the whole loading process and no obvious premature damage observed in CFRP bars aroused by anchorage effect at relative low stress level, indicating the anchorage configuration in this study is reliable.
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Wanru Wang,Rao Fu,Qi Deng,Xinyuan Wang,Yujie Wang,Zhao Zhang,Guijun Xian 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
Natural fiber reinforced polymer composite has been widely used in various industry fields. Natural fibertreatment can effectively improve its mechanical and durability properties, and expands its applications. In the present study,isocyanate was proposed to treat flax fibers in order to reduce the hydrophilic properties of the fibers, and to enhance thebonding of flax fiber to epoxy matrix. The isocyanate treated fabric was evaluated with fourier transform infra-red (FTIR),scanning electron microscopy (SEM) and water uptake. The effects of the fiber treatment on the mechanical properties of flaxfabric reinforced epoxy (FFRP) plates were investigated. FTIR and SEM analysis indicated that isocyanate reacts with flaxfiber, forming a thin polymer layer on the fiber surface. The water absorption test showed that isocyanate treatment decreasedthe water uptake of the flax fabric by 4-18 times compared to the control fabric. The flexural and tensile strength of FFRPwith isocyanate solution treated fabrics were enhanced more than 20 %, attributed to the improved adhesion of fiber to epoxy. Based on the above results, the treatment method of flax fiber with isocyanate is considered as an effective approach toimprove both hydrothermal ageing resistance and mechanical properties of FFRPs.
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