Studies of Hydrodynamic Ram Induced by High Velocity Spherical Fragment Simulators
Final rept. Aug 75-Nov 76
DAYTON UNIV OH RESEARCH INST
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Hydrodynamic ram events in simulated fuel cells have been studied both experimentally and theoretically. A moire fringe technique was developed for dynamic measurement of out-of-plane displacement. Spherical projectiles 11.1 and 14.3 mm diameter were used in the velocity range 1.5 to 2.4 kms. Data for entrance and side panel displacement, projectile trajectory, cavity growth, shock propagation, and fluid pressure were obtained for many impact configurations. A fluid drag code, a fluid shock code, the BR-1A HR code, the AFTON finite difference code, and the NONSAP finite element code were exercised and the results compared with experimental data. It was found that the failure mode of entrance panels was propagation of cracks caused by hoop stresses induced at very early times around the entrance site. Entrance panel damage was reduced by use of ductile alloys and eliminated by ballistic foam of thickness equal to the projectile diameter.
- Fluid Mechanics