Effects of magnetic flux viscosity flow on dynamic stress intensity factor in high temperature superconductor

Abstract

Abstract: Establish a simple high-temperature superconducting material model: place a superconducting cylinder with a central crack in a falling external magnetic field. Using plane strain theory and other methods, the relationship of the Lorentz force in the superconducting cylinder with time is calculated, and the ABAQUES finite element analysis method is used to solve the time-varying dynamic stress intensity factor. By changing the viscous flow velocity of the magnetic flux, the length of the crack and the maximum applied magnetic field, the change process of the dynamic stress intensity factor under different conditions can be obtained. The results show that the existence of viscous flow of magnetic flux changes the distribution of the trapped magnetic field of the superconducting cylinder, significantly increases the peak value of the dynamic stress intensity factor of the superconducting cylinder, and increases the rate of increase of the dynamic stress intensity factor. In the study of various aspects of high-temperature superconductors, the viscous flow of magnetic flux should not be ignored.

Key words: dynamic stress intensity factor, magnetic flux viscous flow, high-temperature superconductor

CLC Number:

O346.1

ZHAO Yu-feng, ZHANG Miao. Effects of magnetic flux viscosity flow on dynamic stress intensity factor in high temperature superconductor[J]. Journal of Lanzhou University of Technology, 2022, 48(1): 168-172.

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