Zhiting Huang

Lanzhou University

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Xingyi Zhang

Lanzhou University

Xiyang Su

Xinjiang University

Cong Liu

Lanzhou University

Jun Zhou

Lanzhou University

Chengcheng Qian

National Marine Environmental Forecasting Center

Jun Zhou

Xi'an Jiaotong University

Shiren La

Qinghai University for Nationalities

Jun Zhou

Civil Aviation University of China

Jùn Zhou

Lanzhou University

Liuyang Shen

Lanzhou University

Cooperative Institutions

Lanzhou University

Shanghai Jiao Tong University

Shandong University

Nanjing University

Northwest Normal University

Wuhan University

National Marine Environmental Forecasting Center

Qingdao National Laboratory for Marine Science and Technology

China University of Geosciences

Ministry of Natural Resources

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The study on non-uniform strain failure of YBa₂Cu₃O7−δ coated conductors with high critical current

Modern Physics Letters B (2024)

Zhiting Huang Chengcheng Qian Xiyang Su Jun Zhou Xingyi Zhang

The YBa 2 Cu 3 [Formula: see text] (YBCO)-coated conductors (CCs) exhibit great potential in the manufacturing of ultrahigh field magnets, superconducting fault current limiter, etc., while the irreversible strain plays a crucial role in designing and optimizing the superconducting devices. However, it is a big challenge to obtain the strain dependence of critical current ([Formula: see text]) of the coated conductor YBCO CC (width = 10[Formula: see text]mm, critical current [Formula: see text]500[Formula: see text]A) because of easy destruction induced by strain concentration near the grips in the process of tension. In addition, factors such as non-uniform deformation, contact resistance, and even mechanoelectrical coupling effect, which can induce non-uniform performance degradation, will be huge barriers against the accurate measurement of irreversible strain. In this paper, the failure phenomena and inducement analysis are studied, and an optimized experimental program is proposed based on the test and finite element analysis, which reduces the measuring errors caused by some unfavorable factors. At the end, the complete electrical performance degradation curve of YBCO CC with high [Formula: see text] is given.

Strain (injury)

10.1142/s0217984925500599

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Controllable rectification on the irreversible strain limit of 2G HTS coated conductors

Superconductor Science and Technology (2021)

Xiyang Su Zhiting Huang Cong Liu Xingyi Zhang

Abstract The second generation high-temperature superconducting coated conductors (CCs) have excellent electrical and mechanical properties, and are extensively used in superconducting devices such as fault current limiters, magnets and motors. During the operation of these superconducting devices, superconducting CCs inevitably bear the combination of electromagnetic force and thermal mismatch stress, resulting in straining of YBa 2 Cu 3 O 7− δ (YBCO) layer along the tape length. It is well known that the strains of superconducting CCs cause degradation of critical current ( I c ). Generally, the irreversible strain limit ( ε irr ) is used to characterize the phenomenon that I c of superconducting CCs degrades with axial strain. When the axial strain of superconducting CCs is less than ε irr , I c can be reversibly recovered by over 99% after being unloaded. Therefore, ε irr is a key parameter for the design and application of superconducting CC devices. For this reason, to carry out a practical engineering method for improving ε irr of superconducting CCs has become a challenge and aroused interests among researchers. This study is based on the idea of precompression. A 316LN stainless steel tape was pretensioned at 77 K to improve its elastic strain limit. Then, two superconducting CCs were soldered onto both surfaces of pretensioned stainless steel tape respectively. As a result, ε irr of the superconducting CCs can be controlled manually with different precompressions. Taking YBCO CCs produced by SuperPower Inc. as an example, the measurement results show that the ε irr of the YBCO CCs increased from 0.39% to 0.73%. Meanwhile, the thickness of the sample did not increase more than once.

10.1088/1361-6668/ac39e9

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Morphology of supercooled droplets freezing on solid surfaces

AIP Advances (2018)

Shiren La Zhiting Huang Cong Liu Xingyi Zhang

Supercooled droplets freezing on solid surfaces are ubiquitous in nature. This letter investigates the influences of droplet viscosity on freezing velocity and frosting formation. Several experiments were conducted for three kinds of sessile droplets (water, silicone oil and oil) on two types of substrates (copper and iron) with different surface roughness at various temperatures. The results show that the water droplets exhibit obvious phase transition lines and their freezing speeds increase when the temperature of substrates decreases. It is found that the freezing speed is independent of the thermal conductivities of the substrates. Notably, the water droplets develop prominent bulges after freezing and subsequently nucleate to frost. In contrast, the high viscosity oil and silicone oil do not manifest an obvious phase transition line. Besides, no bulges are observed in these two kinds of droplets, suggesting that these frosting forms are of different mechanisms compared with water droplets.

Supercooling

Silicone oil

Frost (temperature)

Oil droplet

10.1063/1.5027673

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Key Issues for Measuring the Irreversible Strain of Rebco Coated Conductors with High Critical Current

Zhiting Huang Chengcheng Qian Xiyang Su Jun Zhou Xingyi Zhang

Strain (injury)

10.2139/ssrn.4912836

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Visualization investigation of the full-field temperature of the damaged YBCO CC after quenching in liquid nitrogen based on bubbles distribution

International Journal of Heat and Mass Transfer (2024)

Xiyang Su Zhiting Huang Jun Zhou Xingyi Zhang

Liquid nitrogen

10.1016/j.ijheatmasstransfer.2024.125283

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Key Issues for Measuring the Electromechanical Properties of 2G HTS Coated Conductors

IEEE Transactions on Applied Superconductivity (2022)

Xiyang Su Liuyang Shen Zhiting Huang Cong Liu Xingyi Zhang

It is significant to investigate the electromechanical properties of second-generation high-temperature superconducting (HTS) coated conductors (CCs). Generally, a four-probe method, with which voltage taps are soldered on the sample, is used to measure the critical current during tension. However, shear stress occurs at the position near the voltage solder joints when the HTS CCs are tensioned, which can only withstand the shear stress of less than 10 MPa and induce reversible strain less than that without solder joints. In this article, a critical current measurement method in which the voltage taps are not soldered on the surface of the HTS CCs is proposed to avoid the effect of voltage solder joints on HTS CCs. The minimum distance between the insulator and the voltage taps is 6 cm when the HTS CC and the voltage taps are soldered on a Cu plate, through which the reliable measurement results of the strain dependence of critical current and irreversible strain of the HTS CCs are obtained.

10.1109/tasc.2022.3176869

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Visualization Investigation of the Full-Field Temperature of Ybco Cc after Quenching in Liquid Nitrogen Based on Bubbles Distribution

Xiyang Su Zhiting Huang Jùn Zhou Xingyi Zhang

YBa2Cu3O7−δ (YBCO) coated conductor (CC) has a high critical temperature, which can be directly applied in liquid nitrogen. If the YBCO CC is quenched in liquid nitrogen, its temperature will rise rapidly, causing the liquid nitrogen to boil. The existence of nitrogen bubbles inhibits the heat dissipation of the YBCO CC, which hinders to the stable operation of equipment. However, it is difficult that how to effectively obtain the full-field temperature of the YBCO CC when it is quenched. In this paper, a liquid nitrogen bubble observation system was set up with an oblique angle of 60°, and its front view was obtained through perspective transformation. Then based on the distribution of nitrogen bubbles on the YBCO CC surface, the temperature distribution on the surface of the YBCO CC was simulated by solving the heat conduction equation with the finite volume method. In the simulation, the transition from superconductivity to normal state into account was taken and a method to calculate the temperature dependence of resistivity was proposed. For the first time, the temperature distribution of YBCO CC was calculated from the bubble distribution. It was found that the temperature in the dry spots was much higher than that in wet spots. The effect of a single bubble on the temperature of YBCO CC was quantified. Meanwhile, by compared the distribution of the magnetic field and the bubble, it was proved that the bubble could also be used for damage detection and made up for the lack of magnetic field detection method to detect the damage inside the superconductor itself.

Liquid nitrogen

10.2139/ssrn.4542984

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