Stress-strain Analysis Of YBCO High-temperature Superconducting Thin Films Subjected To Electromagnetic Forces

As we all know,the Stress-Strain investigation is fundamental subject in mechanical behavior of YBCO High-Temperature Superconducting thin films.In critical state Bean modal,the superconducting thin films are mainly investigated the Stress-Strain distribution subject to perpendicular magnetic field and Transport current.The following are dominating work and results:Firstly,based on the effect of perpendicular magnetic field or Transport current,this paper discussed the magnetic flux penetration behavior of the superconducting thin films,which shown that the magnetic flux vortex tend to migrate toward the center of the films.The vortex line in the superconducting film will be stagnated considering the effect of flux pinning induced,which accompanied with an electromagnetic-mechanical behavior caused by the interaction of the Lorentz force and the pinning force.Secondly,as the superconducting thin films only effected by the external magnetic field,and the superconductor generate induction magnetic field and current density.So the stress-strain expression of YBCO high-temperature superconducting thin films under the perpendicular magnetic field was deduced,and obtain the stress-strain distribution map by using the mathematical tools and mapping software.The results show that the stress-strain of the superconducting thin films were mainly distributed on both sides of the film under the applied magnetic field.It is also found that the stress-strain extremes of the films increase with the increase of the applied magnetic field.Finally,considering the YBCO high temperature superconducting film only by the role of transport current,the stress-strain distribution of superconducting thin films under the action of transport current was analyzed and the expression between the stress strain and the transport current is deduced,and obtain the stress and strain distribution map by using the mathematical tools and mapping software.The results show that the superconducting thin films will produce electromagnetic force in the internal of transport current,and produces Stress-Strain under the interaction between Lorentz force and pinning force.It is also found that the transmission current flows only on both sides of the superconducting film.While the stress-strain is also mainly distributed in this area.Under different transmission current intensity,the stress and strain on the superconducting thin film are increased from the two boundaries of the film to the center position.