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EURODYMAT 1997 - 5th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
J. Phys. IV France 07 (1997) C3-211-C3-216
DOI: 10.1051/jp4:1997338
The Development of a Method of Measuring a Condensed Matter Electroconductivity for Investigation of Dielectric-Metal Transitions in a Shock Wave
S.D. Gilev1 and T.Y. Mihailova21 Lavrentyev Institute of Hydrodynamics, Lavrentyev prosp. 15, Novosibirsk 630090, Russia
2 Novosibirsk State University, Pirogova ul. 2, Novosibirsk 630090, Russia
Abstract
The electromagnetic method of investigating the
dielectric-metal transition under shock compression of condensed matter is
discussed. The investigation of transient electromagnetic processes is
performed for the measuring cell comprising two conductive regions (the
reference conductor, the test matter). The model E(t) - dependencies of the
electric field are found. They can be compared with the corresponding
experimental dependencies of the voltage V(t). The E(t) curves are proved to be
essentially dependent on the conductivity value and the nature of the
conductivity change behind a shock front. The analysis performed provides the
basis for the interpretation of the voltage records taken from the experiments
with the highly porous aluminium.
Résumé
On discute la méthode d'investigation de la transition
diélectrique-métal sous une compression par choc de la matière condensée. Les
processus électromagnétiques transitoires sont mesurés par une cellule
comprenant deux domaines conductifs (conducteur étalonné, matière testée). On a
modélisé la dépendance du champ électrique en fonction du temps E(t), qui peut
être comparée avec la dépendance expérimentale de la tension en fonction du
temps V(t). Il apparaît que les courbes E(t) dépendent considérablement de la
valeur de la conductibilité de la matière et du caractère du changement de
conductibilité derrière le front du choc. L'analyse effectuée forme une base à
l'interprétation des enregistrements de la tension dans les expériences avec la
poudre d'aluminium hautement poreuse.
© EDP Sciences 1997
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