Projectile retardation with ERA (Explosive Reactive Armour)

The disturbing effect on Shaped Charge jets and Kinetic Energy projectiles, caused by rapidly moving plates that intercept the projectiles before they reach the main target, is modelled. The intention is to obtain a model which describes the process´ in reasonable detail and is still sufficiently simple to be incorporated as a small but important part of a large computer program for evaluation of effects and vulnerability for complex targets. The impacts against the moving plates normally occur with significant yaw, which requires modification of previously proposed perforation models. For KE projectiles the plate interaction yields subsequent motion such that the impact against a target behind the plate also occurs with significant yaw. If the target is "thin", then it may be treated in the same manner as the previously impacted plate, but for "thick" targets a new model remains to be suggested.