Ultimate kinematic characteristics of composite solids accelerated by a magnetic field
S. V. Stankevich, G. A. Shvetsov
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090
Pages: 354-361
Abstract
The present paper considers the ultimate
(under heating conditions) kinematic
characteristics of composite solid
bodies accelerated by unsteady magnetic-
field pressure. The accelerated sheet
comprises two layers: a layer of a
composite material consisting of a
mixture of two materials with different
electrothermal properties and a
homogeneous material layer. The
electrical properties of the composite
layer with the coordinate are varied
along the coordinate by changing the
volume concentration of its constituent
materials. For an exponential magnetic
field rise, an analytical solution is
obtained for the problem of determining
the optimum distribution of the volume
concentration of the composite
constituents for which there is a
maximum increase in the ultimate
velocity of the sheet. Numerical
simulation showed that the distribution
of the volume concentration obtained
from analytical relations is also nearly
optimal for pulse shapes of the
accelerating magnetic field different
from exponential ones. The possibility
of considerably increasing the ultimate
velocity through the use of composite
layers compared to the ultimate
velocities for the homogeneous materials
constituting the composite is shown
analytically and numerically.
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