Options
1993
Journal Article
Title
Impact flash and debris cloud expansion of high-pure metal foils
Abstract
Results of 2 mm aluminium spheres perforating Al, Cu, Mo, Ag, Au, Sn, and Zn metal foils of a purity bigger than 99.9 percent with thicknesses between 0.1 mm and 2.0 mm, densities of up to 20 g/ccm, melting temperatures of 500 - 3000 K and specific heats of fusion of 20 - 350 kJ/kg at impact velocities between vp=4.5 km/s and vp=9km/s are presented. The influence of target thickness, target material properties and impact velocity on the perforation hole diameter, impact flash duration and expansion velocity, fragmentation and debris cloud formation at nearly constant areal density is demonstrated. The dependence of impact crater pattern at witness plates on target material density, thickness, impact velocity and areal density ratio between projectile and target material is discussed. For tin and lead evidence is given for the ability of digital scanning electron microscope analysis as an effective tool for indicating change of aggregation from solid into liquid and for the determinatio n of relative projectile and target material quantities.
Conference
Keyword(s)
aggregation
Bildwandlerkamera
compound analysis
debris cloud
fragmentation
Fragmentierung
geometrical shape
Geometrie
image converter camera
impact crater pattern
impact flash
Impaktblitz
Impaktkratermuster
ionization
material distribution
melting
phase transition
Phasenübergang
plasma generation
Plasmaerzeugung
residual velocity
Restgeschwindigkeit
Schmelzen
Splitterwolke
state
two-stage light gas gun
vaporisation
Verdampfen
Zweistufenleichtgaskanone