Investigation of the Material Behavior of the Filling Resin of 155 mm Shot (Etude du Comportement au Tir du Remplissage des Projectiles 155 mm)

Abstract : One currently leads at the ISL studies on a new concept of ammunition: the projectile of observation (project D 2c ) . In crisis, the information is an essential factor. In order to give a certain independence to the units of artillery, one thought of equipping a projectile with gauge 155 mm of a camera CCC able to send on the ground, in real time, the images of the zone flown over. Project D 2c presented in introduction, more precisely defines the role of this projectile of observation. The use of a complex device in projectiles launched with an acceleration reaching 14000 g is accompanied by many problems involved in the resistance of embarked materials. The partners of shootings already realized account for the difficulty in finding components adapted, able to resist such requests. This report treats behavior of the resin of filling of the projectile, resin which has as a role the maintenance of the embarked elements and the homogenisation of the distribution of the masses in the projectile. In the case of the projectiles of gauge 155 mm, the volume of filling reaches a few liters, and the effects of the contraction of the resin are not negligible. This contraction is all a simple analytical calculation, then by a finer numerical simulation. Lastly, one simulates the real case by using the mechanical characteristics raised in experiments on the resins used. It is shown that the choice of an adapted composite material, associated with the installation of cross-pieces in the projectile, makes it possible to solve the problem of the compression of the resin of filling.