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bending performance analysis on YBCO cable with high flexibility

Superconductivity 2023年第3期7卷 27-33页

作者： Huan Jin Qiong Wu Guanyu Xiao Chao Zhou Haihong Liu Yunfei Tan Fang Liu Jinggang Qin Institute of Plasma Physics Chinese Academy of SciencesPO Box 1126HefeiAnhui 230031China Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui 230031China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China University of Science and Technology of China No.96JinZhai Road Baohe DistrictHefeiAnhui 230026China

In order to utilize high‐temperature superconducting Yttrium Barium Copper Oxide(YBCO)tapes to develop superconducting cables for high magnet field applications,it is critical to ensure the stable operation of the YBCO cable under challenging mechanical and thermal conditions.A new type of cable featuring the winding of YBCO and copper tapes around a spiral stainless steel tube has been proposed to increase flexibility and *** are performed to confirm that its critical current varies with the bending *** cables wound with nine YBCO tapes in three layers show a critical current degradation of less than 5%for a bending diameter of 30 *** performance of the cable degrades as the number of wound layers *** critical current degradation of cable specimens wound from 15 tapes in five layers reached approximately 12%for a bending diameter of 30 *** addition,when compared to traditional CORC cable specimens,the developed cable specimens show better‐bending flexibility and achieve a lower critical bending *** finite element models show that the higher elasticity coefficient and lower plasticity of the stainless steel spiral tube results in a lower strain on the YBCO tapes of the HFRC cable than that of the CORC cable,and the maximum strain on the YBCO tapes of the HFRC cable was only about 10%of that of the CORC ***,it is less likely that the YBCO tape in this type of cable will reach the irreversible strain limit during bending,resulting in a degradation in current carrying ***,the cooling efficiency can be improved by flowing the cooling medium inside the central core,which can significantly improve its thermal *** advantages indicate the possibility of using it in future high‐field magnets with high current carrying capacity at fields greater than 15 T.

关键词： YBCO cable Flexibility bending performance Cooling efficiency

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Experimental Study on the Influence of Cross-Section Type of Marine Cable Conductors on the bending performance

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China Ocean Engineering 2022年第4期36卷 629-637页

作者： YAN Jun HU Hai-tao LU Hai-long YIN Yuan-chao BU Yu-feng LU Qing-zhen State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInter-national Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China Ningbo Research Institute of Dalian University of Technology Ningbo 315016China State Key Laboratory of Structural Analysis for Industrial Equipment School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China

Through the development of marine energy,marine cables are the key equipment for transmission of electrical energy between surface platforms and underwater *** failure is a critical failure mode of marine *** bending performance of the cable conductor has a major influence on both bending and fatigue performances of the overall cable *** study the influence of different types of the conductor cross-section on the bending performances of marine cable conductors,three types of copper conductors with the same cross-sectional area,i.e.,noncompressed round,compressed round,and shaped wire conductors,were *** experimental results demonstrated that the cross-section type significantly affects the bending performances of copper *** particular,the bending stiffness of the shaped wire conductor is the highest among the three conductor *** key evaluation parameters,i.e.,the bending stiffness,maximum bending moment,envelope area,and engineering critical slip point,were selected to compare and analyze the bending hysteresis curves of the three copper *** differences in the key evaluation parameters were analyzed based on the structural dimensional parameters,processing methods,and classical bending stiffness theoretical models of the three copper conductor *** results provide an important theoretical guidance for the structural design and engineering applications of marine cable conductors.

关键词： marine cable conductors cross-section type bending performance theoretical model bending test

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bending performance of TRC-strengthened RC beams with secondary load under chloride erosion

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Journal of Central South University 2019年第1期26卷 196-206页

作者： YU Yu-lin YIN Shi-ping NA Ming-wang State Key Laboratory for Geomechanics and Deep Underground Engineering School of Mechanics and Civil Engineering China University of Mining and Technology Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering School of Mechanics and Civil Engineering China University of Mining and Technology

Textile reinforced concrete(TRC)has good bearing capacity,crack resistance and corrosion resistance and it is suitable for repairing and reinforcing concrete structures in harsh marine *** four-point bending method was used to analyze the influence of the salt concentration,the damage degree and the coupled effect of the environment and load on the bending performance of TRC-strengthened beams with a secondary *** results showed that as the salt concentration increased,the crack width and mid-span deflection of the beam quickly increased,and its bearing capacity *** the damage degree increased,the early-stage crack development and mid-span deflection of the beam were less affected and the ultimate bearing capacity significantly *** addition,the coupled effect of the environment and load on the beams with a secondary load was *** the sustained load increased,the ultimate bearing capacity of the strengthened beam decreased,and cracks developed faster in the later *** addition,the mid-span deflection of the beam decreased at the same load level because of the influence of the initial deflection due to the sustained load corrosion.

关键词： textile reinforced concrete bending performance secondary load sustained load corrosion

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Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets

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Science China(Technological Sciences) 2011年第4期54卷 841-852页

作者： ZHAN Mei JIANG ZhiQiang YANG He XU XuDong LI GuangJun State Key Laboratory of Solidification Processing College of Materials Science and EngineeringNorthwestern Polytechnical UniversityP.O.Box Xi'an 00China Chengdu Aircraft Industry(Group) Corporation Ltd Chengdu 610092China

The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy *** order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die *** paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets,including the variations in the stress,strain,wall thickness,cross sectional deformation,and *** results show that adding a wiper die to the base die set decreases the radial,hoop,and tangential compressive stress and the tangential compressive strain,and adding a mandrel to the base die set also decreases these stresses,but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously,and brings about a three-dimensional tensile stress concentration where the mandrel provides *** the NC bending of medium strength TA18 tubes,the flattening of cross section is more sensitive index than the thinning of wall *** a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness,and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section *** the above effects of the mandrel and wiper die on bending performance,it is reasonable to apply the die set comprising a bending die,clamp die,and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter,in order to bend the medium strength TA18 tubes with high quality and at low cost.

关键词： bending performance medium strength titanium alloy tube numerically controlled bending die set

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Flexural behaviour of SFRRAC two-way composite slab with different shapes

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Journal of Southeast University(English Edition) 2020年第4期36卷 414-424页

作者： Luo Bin Huang Wei School of Civil Engineering Lanzhou University of Technology Lanzhou 730050 China School of Civil Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

To promote the application of green renewable materials in concrete composite slabs(CCSs)and study the flexural behavior of CCSs with different shapes,the bending performances of three CCSs with a SFRRAC base plate,one cast-in-site concrete slab of ordinary concrete and one CCS of ordinary concrete by steel bar truss(as recommended in the technical specification for precast concrete structures in Chinese)were compared through *** carrying capacity,flexural behaviour and bi-directional mechanical properties of the specimens were systematically analyzed from the failure modes,load-deflection curves,load-bar strain curves,load-slip curves and crack *** show that the bending failure process of CCSs with a SFRRAC base plate is similar to that of the cast-in-site concrete slab of ordinary concrete and CCS of ordinary concrete by steel bar truss,as all of them went through the plastic phase,elastic plastic phase and failure phase with fully developed cracks and *** sudden breakage or horizontal cracking of the connecting interface between the base plate and concrete topping was *** shape of the base plate has a major impact on the bearing capacity of the CCS with the SFRRAC base *** calculating the ultimate bearing capacity with the plastic yield line theory,the influence of the base plate shape on the plastic yield line position should be taken into account.

关键词： concrete composite slab(CCS) shape steel bar truss bending performance ultimate bearing capacity

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