Accession Number : AD0775801

Title :   Gas Gun Launch of Free Flying Thin Plate,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Blackburn,James C. ; Brody,Phillip S.

Report Date : AUG 1973

Pagination or Media Count : 32

Abstract : The report describes a method used for propelling a thin disk (flyer plate) against a target to produce pulse-form shocks. A projectile is accelerated in a rupturing-diaphragm type gas gun, strikes a fixed metal plate, and is stopped. The impact-generated shock wave travels through the metal plate and spalls off a thin aluminum disk attached to its opposite surface. The method of bonding the thin disk to thee plate is critical for good shock transfer; low-viscosity Eastman 910 adhesive is most satisfactory. Disks 0.8 mm or 0.3 mm thick and 8.5 cm in diameter are propelled at velocities up to 280 m/sec, impacting a target flat within 0.1 mm. The expected flyer-to-projectile velocity ratio and wave profiles is computed with the PUFF 66 code. The predicted velocity ratio is 0.78 and the experimental value is 0.61; this is a reasonable discrepancy considering the simplifying assumptions. In relatively low-velocity thick flyers this method appears comparable to the best available. (Author)

Descriptors :   *LIGHT GAS GUNS, *FLYER PLATES, PROJECTILES, SHOCK WAVES, ENERGY TRANSFER, IMPACT, SPALLATION

Subject Categories : Test Facilities, Equipment and Methods
      Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE