Accession Number : ADA193576

Title :   EPIC-2 Predicted Shock Environments in Rolled Homogeneous Armor for Nonperforating Ballistic Impact.

Descriptive Note : Technical rept.,

Corporate Author : ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s) : Quigley, Ennis F

PDF Url : ADA193576

Report Date : Jan 1988

Pagination or Media Count : 42

Abstract : A series of controlled experiments were conducted to characterize the ballistic shock environment produced in rolled homogeneous armor by nonperforating ballistic impact. Displacements, velocities, accelerations and strains were measured at various locations on the back of 38 and 70 mm thick, 914 mm x 914 mm plates impacted by ball bearings and small caliber projectiles (30 caliber to 20 mm). Projectile impact velocities ranged from 335 m/s to 1508 m/s. Peak displacement measurements obtained for projectile impact agreed well with simple momentum predictions. However, velocity and acceleration measurements were inconsistent and a number of accelerometers were destroyed. Because of these measurement difficulties, the EPIC-2 hydro-code was used to calculate the plate velocity and acceleration distributions for the impact of the 20 mm projectile at impact velocities of 366, 1012 and 1508 m/s. Plate displacements, velocities, accelerations and strains were calculated for a 300 microsec. time period and comparison of measured and calculated displacements and strains for the three impact velocities showed good to excellent agreement. Maximum calculated accelerations below the impact point on the back surface of the plates ranged from 500,000 g's to 4,000,000 g's.

Descriptors :   *ARMOR, *TERMINAL BALLISTICS, *IMPACT, *MATHEMATICAL PREDICTION, *IMPACT SHOCK, ACCELERATION, BALL BEARINGS, CONTROL, DISPLACEMENT, DISTRIBUTION, ENVIRONMENTS, HOMOGENEITY, IMPACT POINT, MEASUREMENT, MOMENTUM, PEAK VALUES, PROJECTILES, ROLLING(METALLURGY), SURFACES, VELOCITY, ARMOR PLATE, HYDRODYNAMIC CODES, PENETRATION, COMPUTERIZED SIMULATION

Subject Categories : Armor
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE