Meteoroid and debris shielding   EMI test 3915, 4.0 mm aluminium sphere, 7.2 km/s, 45 degrees 1.2 mm Al7075 bumper 49.5 mm spacing 3.3 Al7075 backwall   Hypervelocity impacts on pressure vessels. Shadowgraph pictures of fragment cloud at different pressures and numerical results (5 mm aluminium sphere, 5.2 km/s)   High Speed Video Shadowgraph of Exp. 3931; shutter time 80 ns (pict. 1-6) Exp. 3931: Whipple shield, 1.2 mm Al 7075-T73, S=49.5, 3.3 mm Al 7075-T7351, Al-projectile d=4.999 mm, v=7.0 km/s, α =60°, result: > BL   High Speed Video Shadowgraph of Exp. 3938; shutter time 80 ns (pict. 1-2) Exp. 3938: Whipple shield, 1.2 mm Al 7075-T73, S=49.5, 3.3 mm Al 7075-T7351, Al-projectile d=6.003 mm, v=7.1 km/s, α =75°, result: < BL   Last update: 31 July 2007