Abstract
The design of railgun projectiles requires a knowledge of rail deflection caused by electromagnetic forces generated during a launch. Sufficient armature-to-rail contact force must be maintained as the projectile passes through the bore. A hydraulic jack has been custom designed and built to fit inside a 5 m/spl times/50 mm composite overwrap railgun barrel designed and built by Benet Weapons Lab. A displacement transducer installed in the jack was used to obtain data leading to the determination of the spring constant of the rail's elastic foundation. This paper presents the use of the rail jack data in determining the static/dynamic rail deflection due to electromagnetic distributed loading in the Benet railgun barrel. Additionally, the concept of critical armature velocity as applied to railguns is introduced. >
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