Vol.6, No 1, 2007 pp. 119-130
UDC 531.3/539.56:539.42(045)=111
CRITICALLY SHAPED CHARGE JET STRESS CAUSED BY ANGULAR VELOCITY 
Marinko Ugrčić, Stevan Maksimović
Military Technical Institute, Ratka Resanovića 1, 11132, Belgrade, Serbia
Abstract. The angular velocity of the shaped charge jet around axial symmetry axis during activation of the shaped charge warhead, especially in the gyroscopic stabilised projectiles, causes intensive changes of the internal stress and deformation state in the jet material. The radial rupture of the shaped charge jet appears under high values of the angular velocity that has the negative consequences on the effectiveness of the warhead, because the drastic penetration reducing. In this way, the qualitative and quantitative determination of the stress and deformation state in the jet material was carried out by finite elements method. The computation of the critical stress in some segments of the shaped charge jet under low angular velocities of the projectile was performed for both cases the elastic and elastic-plastic behaviour of jet material. The nonlinear analysis was attended primary to determine the critical values of angular velocities when maximum stress in jet material equals to the fracture tensile strength.
Key words: shaped charge warhead, shaped charge jet, determination of the stress and deformation, finite elements method
KRITIČNI NAPON U KUMULATIVNOM MLAZU IZAZVAN ROTACIJOM
Obrtanje kumulativnog mlaza oko uzdužne ose pri dejstvu kumulativne bojne glave, posebno kod žiroskopski stabilisanih projektila, izaziva intenzivne promene unutrašnjeg naponsko-deformacionog stanja u materijalu mlaza. Pri visokim nivoima ugaone brzine dolazi do pojave radijalnog kidanja kumulativnog mlaza što ima negativne posledice na efikasnost bojne glave, jer dovodi do drastičnog pada probojnosti. Kvalitativno i kvantitativno određivanje naponsko-deformacionog stanja u materijalu mlaza izvršeno je metodom konačnih elemenata. Proračun napona i deformacija u određenim segmentima kumulativnog mlaza, pri malim vrednostima rotacije projektila, urađen je za dva slučaja, elastični i elasto-plastični model mlaza.
Ključne reči: Kumulativna bojna glava, kumulativni mlaz, određivanje napona i deformacija, metoda konačnih elemenata