On Singularities of Physical Characteristics in the Vicinity of an Electric Contact

This work appeared in connection with a mathematical simulation of phenomena taking place in an electromagnetic launcher of conductive armatures of a railgun type at acceleration up to high and ultrahigh velocities. There are presented analytical solutions of the problem of diffusion of a magnetic field from the region between rails for a two-dimensional case. Motionless and moving contacts are considered. The results of numerical experiments on finding of an order of singularity of physical fields are presented. The solutions obtained allow one to explain a number of the results of both numerical calculations using a 2D code and actual experiments.