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Impact flash and debris cloud expansion of high-pure metal foils

: Weber, K.; Hohler, V.; Stilp, A.J.


International Journal of Impact Engineering 14 (1993)
ISSN: 0734-743X
Hypervelocity Impact Symposium <1992, Austin/Tex.>
Fraunhofer EMI ()
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

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.