Rails for electromagnetic hypervelocity launcher

Details Rails for electromagnetic hypervelocity launcher Rails for electromagnetic hypervelocity launcher

2006-11-02

2008-08-12

Hayes, Bret (Department: 3641)

Ordnance

Accelerating

C124S003000

Reexamination Certificate

active

07409900

ABSTRACT:
An electromagnetic launcher is provided for accelerating a projectile from a breech end to a muzzle end. The launcher includes a container, a rail contained therein and a support. The container includes an inner surface along an axial direction. The rail is contained within the inner surface and includes a load surface to support the projectile and an interface surface. The support is disposed between the interface surface and the inner surface. The rail and the support provide a value to an expression for critical velocityVcr=2⁢EIkρ⁢⁢A,where E is Young's modulus for the rail, I is moment of inertia for the rail, k is foundation modulus for the support, ρ is density for the rail and A is the cross-sectional area of the rail. The launcher is configured such that the critical velocity increases along the axial direction towards the muzzle. In particular, a material term √E/ρ of the rail increases along the axial direction, such for the rail being made from a first material being proximate to the breech and a second material being proximate to the muzzle, such that the material term √E/ρ of the second material being greater than that of the first material. Alternatively, the rail is made into a first shape being proximate to the breech and a second shape being proximate to the muzzle, such that a shape term √I/A of the second shape is greater than that of the first shape.

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N. V. Nechitailo et al., “Critical Velocity For Rails in Hypervelocity Launchers”,Int'l J. of Impact Engineering, not yet published.
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