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Electric-magnetic-force characteristics of rare earth barium copper oxide superconductor high-field coils based on screening effect and strain sensitivity

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Applied Mathematics and Mechanics(English Edition) 2022年第8期43卷 1249-1268页

作者： Wenhai ZHOU Youhe ZHOU Key Laboratory of Mechanics on Environment and Disaster in Western China The Ministry of Education of ChinaCollege of Civil Engineering and MechanicsLanzhou UniversityLanzhou730000China School of Petrochemical Technology Lanzhou University of TechnologyLanzhou730050China

Rare earth barium copper oxide(REBCO)is the most researched and commercialized second-generation high-temperature superconducting *** to the anisotropic structure,strong deformation sensitivity,and central field errors caused by screening current effects,it is still a challenge for commercialization *** this study,the transversely isotropic constitutive relationship is selected as the mechanical model based on the structural characteristics of REBCO tapes,and suitable microelements are selected to equate the elastic constants using their average stress-strain ***,a two-dimensional axisymmetric model for coils wound by single-layer tapes is constructed to analyze the dependence of the electric-magnetic-force distribution in the tape on the ***,the anisotropic approximation of the homogenized bulk method is used to equate large-turn high-field coils,and the electric-magnetic-force distribution characteristics of the coils with/without screening effects and mechanical strain conditions are investigated,*** results reveal that the mechanical strain has a weakening effect on the electromagnetic field distribution of superconducting tapes,but causes a significant enhancement in the force field *** the presence of 0.5% mechanical strain,the maximum weakening of the peak value of the current density and the critical current density inside the high-field coil can reach about 8% and 13%,respectively,with a nearly 5 times increase in the peak *** screening current makes the current field distribution inside the coil improve by about 10 *** screening current induced magnetic field can reach up to 0.8 T,making the relative error of the high-field coil center up to 7.8%.

关键词： screening current strain sensitivity mechanical behavior rare earth barium copper oxide(REBCO)high-field coil electromagnetic field distribution

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Effect of strain Rate on Tensile Behavior of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} Lead-Free Solder Alloys

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Materials Sciences and Applications 2023年第4期14卷 273-283页

作者： Shihab Uddin Md. Abdul Gafur Mohammad Obaidur Rahman Department of Physics Jahangirnagar University Savar Dhaka Bangladesh Pilot Plant and Process Development Centre Dhaka Bangladesh

The tensile properties of Sn-9Zn-xAg-ySb;{(x, y) = (0.2, 0.6), (0.2, 0.8), (0.6, 0.2), (0.8, 0.2)} lead-free solders were investigated. All the test samples were annealed at 150°C for 1 hour. The tests are carried out at room temperature at the strain rate of 4.17 × 10-3 s-1, 20.85 × 10-3 s-1, and 208.5 × 10-3 s-1. It is seen that the tensile strength increases and the ductility decrease with increasing the strain rate over the investigated range. From the strain rate change test results, the strain sensitivity values are found in the range of 0.0831 to 0.1455 due to the addition of different alloying elements.

关键词： Lead-Free Solder strain Rate strain sensitivity Ductility Tensile Properties

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Continuous Deformation Monitoring by Polymermatrix Carbon Fiber Sensitive Layer

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Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 705-712页

作者：郑华升 ZHU Sirong LI Zhuoqiu The State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology) School of Science Wuhan University of Science and Technology School of Science Wuhan University of Technology

Composite made of short-cut carbon fiber mat and vinyl ester resin was observed to be an effective sensor for tensile strain up to 6 000με. Based on its strain sensitivity, a skin-like sensitive layer which can continuously cover the structural surface to sense strain in large area was developed. The sensitive layer was applied to continuously monitor the deformation of a simply supported beam. The result indicates that the fractional change in electrical resistance of the sensitive layer reversibly reflects the beam deformation in each section and describes the distribution of the average strain of the beam. The effect of temperature change on the monitoring was studied by monitoring tests conducted at different temperatures ranging from 20 to 80 ℃, which reveals temperature sensitivity in the sensitive layer and the temperature dependence of the piezoresistive behavior when the temperature exceeds 50 ℃. By the application of differential conaection principle, a method for temperature compensation was established and the gauge factor for the monitoring was dramatically increased. This method was verified experimentally.

关键词： polymer-matrix carbon fiber sensitive layer strain sensitivity continuous deformation monitoring temperature compensation

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