PROJECTILE DAMAGE IN STRESSED PLATES.
Abstract
Targets consisting of 7075 T-6 aluminum with a thickness of 0.190 in. were impacted by 7.62 mm and 0.50 cal. projectiles at impact velocities from 800 to 2800 fps. Tensile pre-stresses up to 30,000 psi were applied to the targets in a direction normal to the visible grain orientation of the material. Impact angle was varied from 0 degrees (normal) to 60 degrees. The first catastrophic failures caused by crack propagation occurred at 20,000 and 10,000 psi for the 7.62 mm and 0.50 cal. projectiles, respectively. An increase in pre-stress had no effect on the energy or momentum loss of the projectile. The maximum damage occurred at the minimum perforation velocity. The velocity range over which target failure due to crack propagation occurred was seen to increase with an increase in prestress. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1967
- Accession Number
- AD0817808
Entities
People
- William Harold Parker
Organizations
- Air Force Institute of Technology