ULTIMATE KINEMATIC CHARACTERISTICS OF ARMATURES WITH ORTHOTROPIC AND ANISOTROPIC ELECTROCONDUCTIVITY

The paper presents the results of the theoretical analysis of ultimate kinematic characteristics of multilayer armatures in railguns. The ul timate kinematic characteristics are obtained provided that the Joule heating of metallic layers by electric current in accelerating does no t tend to increase the temperature in an arbitrary layer above its mel ting temperature. Consideration is given to the accelerated armatures consisting of metallic layers separated by insulating or weakly conduc ting layers. The study provides some dependencies of the ultimate velo city on the acceleration distance and armature mass resulting from a n umerical solution of equations for the unsteady magnetic field diffusi on and the heat conductivity in the two-dimensional statement. A possi bility of increasing the ultimate kinematic characteristics is conside red by changing the armature structure and properties of layer materia ls.