J. Phys. IV France 10 (2000) Pr9-689-Pr9-694
A numerical investigation of high velocity impact onto a ceramic blockJ.Y. Tranchet1, F. Collombet2, 3 and F. Malaise1, 4, 5
1 Centre d'Études de Gramat, 46500 Gramat, France
2 LAMEFIP-ENSAM, Esplanade d'Arts et Métiers, 33405 Talence, France
3 Université de Toulouse 3, Laboratoire de Génie Mécanique, 133 avenue de Rangueil, 31077 Toulouse cedex 4, France.
4 LAMEFIP-ENSAM, Esplanade d'Ah et Métiers, 33405 Talence, France
5 Centre d'Études Scientifiques et Techniques d'Aquitaine, 33114 Le Barp, France.
A heavy metal alloy long rod, impacting a ceramic block at high velocity, can be stopped if pressure surrounding the area of impact is applied (frontal dynamic confinement). A modelling approach based on an original description of the fragmentation process of the ceramic is proposed. In particular, effects of the void content of the fragmented ceramic on its shear resistance are taken into account. An approach combining ballistic experiments and Eulerian computations shows that conditions for rod dwell are linked to immobilising fragments of ceramic in front of the projectile. Computations are presented for a penetrator impacting a silicon carbide (SiC) target at about 1500 m/s, and the results are compared to test data in order to validate the basic hypotheses of the modelling approach.
© EDP Sciences 2000