J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
Page(s) 1009 - 1014
Publié en ligne 26 juillet 2006
EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 1009-1014

DOI: 10.1051/jp4:2006134154

Ballistic behavior of alumina with niobia additions

A.V. Gomes, L.H.L. Louro and C.R.C. Costa

Department of Mechanical and Materials Engineering, Instituto Militar de Engenharia, Praça General Tibúrcio 80, Rio de Janeiro RJ 22290-270, Brazil

Published online: 26 July 2006

The combination of hard and brittle ceramics with ductile materials is an efficient way of providing enhanced protection of armored vehicles against bullet penetration without losing mobility. For the first kind of material, alumina based ceramic compositions containing up to 6 wt% niobia were sintered at temperatures between 1400$^{\circ}$C and 1600$^{\circ}$C. The samples were characterized by x-ray diffraction, energy dispersive spectroscopy and fracture analysis using scanning electron microscopy. Elastic longitudinal and shear wave velocities were also measured. This material was submitted to ballistic test simulations using the 2D AUTODYNE Program, where a 7.62 mm AP projectile with 870 m/s impact velocity hit ceramic plates glued onto Al 6061-T6 aluminum blocks. The technique was used to study, in a systematic way, a variable that correlates projectile fragmentation with that of the target, thus quantifying the efficiency of each composition regarding ballistic protection. The results were used to evaluate the influence of niobia addition and sintering temperature on the densification, microstructure, and ballistic protection of alumina based ceramics.

© EDP Sciences 2006