JOURNAL DE PHYSIQUE

chargement dynamique constitue le noeud central du schema de prevision de la protection balistique de ces materiaux, reliant leurs proprietes m6tallurgiques intrinsbques A leurs caracteristiques de resistance a la perforation. Cet article presente diffQrents travaux experimentaux se rapportant ti cette connaissance du comportement dynarnique d'aciers A blindage, soumis a de grandes vitesses de deformation, sous les aspects Qtude de I'ecoulement dynamique des materiaux en fonction de leur vitesse de deformation et etude de leur deformation rupture sous chargement dynamique. Abstract- The armoured steels mechanical behaviour knowledge under dynamic loading forms the middle link of the estimation diagram of the armoured materials ballistic protection, between their specific metallurgical properties and their perforating strength characteristics. This paper shows various experimental results leading to know the high strain rate behaviour of armoured steels, by studying on the one hand the dynamic flow stress of materials versus thelr strain rate, on the other hand their rupture deformation under dynamic loading