Measurement of Surface Waves Produced by Small Explosions in Aluminum.
Abstract
Measurements were made o the surface motion produced by the detonation of a small high explosive charge just beneath the surface of an aluminum block. The vertical displacement of the surface as a function of time was measured with capacitor type displacement gauges. Measurements were made at several distances from the charge and the aluminum block was large enough that reflection from the bottom or sides did not interfere with surface displacements during the period of measurement. The experiments showed the existence of three distinct surface waves. The velocity of the first wave was that of a dilatational wave in aluminum and the second wave that of a shear wave. The velocity of the third wave was nearly the same as that of the second wave, but its arrival was delayed beyond that of the second wave. The amplitude of the third wave was somewhat larger than that of either of the first two waves. Calculations which were performed at Shock Hydrodynamics, Inc., showed the same three waves that were observed in the experiments. The calculated wave amplitudes were greater than those measured; the differences may have resulted from using too great an explosive energy release in the calculations. The third wave was interpreted from the calculations as one which was generated by the elastic rebound of the crater.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1970
- Accession Number
- AD0717985
Entities
People
- B. Hartenbaum
- H. R. Kratz