Fuel Tank Survivability for Hydrodynamic Ram Induced by High Velocity Fragments: Part I. Experimental Results and Design Summary
Final rept. Sep 77-Oct 78
DAYTON UNIV OH RESEARCH INST
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Failure data, displacement data, and pressure data were obtained from laboratory experiments. Panels were made from 7075-T6 and 2024-T3 aluminum and from graphite epoxy panel thicknesses were 1.6 to 6.35mm. Protection included 10-mm-ballistic foam and stiffeners. Projectiles were 5.6-g and 11.7-g spheres and cubes. Failures were always catastrophic, and failure thresholds were always abrupt. When cracks formed, they ran across the panels, except when stiffeners were present. In thin panels, cracks initiated at the corners of the perforation when cubical fragments were used. The entrance panel damage was primarily induced by the shock wave generated by the impact. The very high shock pressure resulted in impulsive loading of the panels that caused prompt crack formation. Cracks were propagated by the displacement field.
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