由于具有优越的独特电磁性能，超导材料被广泛应用在许多高新技术领域中。然而随着超导性能的提高，超导体在高电流下出现磁通流动不稳定会引起明显的能量损耗和热效应并形成复杂的磁-热耦合系统；超导体受到电磁力作用出现明显的力学变形和裂缝并导致超导性能退化受到研究者的重视。本项目将考虑磁-热耦合效应，建立含裂缝超导体磁-热耦合系统的数值分析方法，从磁通涡旋运动角度探索超导体在外加电流和磁场作用下磁通流动、电压跳跃和温度场变化规律，揭示出裂缝和力学应变影响超导体电流-电压特征曲线和能量损耗而造成超导性能退化的微观机理。分析含不同钉扎中心和金属涂层的超导体磁-热耦合系统随时间演化规律，研究改变钉扎中心分布和金属涂层并对其进行优化来调控超导体的磁通流动稳定性和能量损耗，最后通过实验验证并完善理论分析。本项目的顺利开展将对评估和调控超导体电磁性能稳定性提供有效的理论指导和科学依据。

Since the superconducting materials exhibit some advantageous properties unique to them, they have been widely used in many advanced technique fields. With the development of the superconducting properties, the superconducting materials continue to attract considerable academic interest due to the facts: (i) the flux-flow instability and the thermal effect of energy dissipative in superconductors under high external current gives rise to a complicate magneto-thermal coupling system; (ii) the cracks and the strain in the superconductors induced by electromagnetic force lead to the degeneration of superconductivity. By considering the magneto-thermal coupling, this proposed project will develop a numerical approach for the magneto-thermal coupling system of superconducting films. In the view of vortex motion, we will study the flux flow, voltage jump and the variation of temperature field in the superconductors exposed in external magnetic fields and transport currents. This project will also reveal the microscopic mechanism of the effects of the crack and strain on the current-voltage characteristics and energy dissipative which results in the degeneration of the superconductors. Furthermore, we will also investigate the evolutions of the magneto-thermal coupling system in hybrid superconductor-metal films with various pinning centers. Additionally, we will try to tune the flux flow stability and energy dissipative of the superconductors by varying the pinning centers and metallic layers and by optimizing their parameters. Lastly, we will implement some experimental measurements to verify and accomplish our theoretical results. The successful implementation of this project will provide the scientific guidance in evaluating and tuning the electromagnetic stability of the superconductors.