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Title: Spall strength and ejecta production of gold under explosively driven shock wave compression

Explosively driven shock wave experiments were conducted to characterize the spall strength and ejecta production of high-purity cast gold samples. The samples were from 0.75 to 1.84 mm thick and 30 mm in diameter. Peak stresses up to 44 GPa in gold were generated using PBX-9501 high explosive. Sample free surface and ejecta velocities were recorded using photonic Doppler velocimetry techniques. Lithium niobate pins were used to quantify the time dependence of the ejecta density and the total ejected mass. An optical framing camera for time-resolved imaging and a single-image x-ray radiograph were used for additional characterization. Free surface velocities exhibited a range of spall strengths from 1.7 to 2.4 GPa (mean: 2.0 ±0.3 GPa). The pullback signals were faint, minimal ringing was observed in the velocity records, and the spall layer continued to decelerate after first pull back. These results suggest finite tensile strength was present for some time after the initial void formation. Ejecta were observed for every sample with a roughened free surface, and the ejecta density increased with increased surface roughness, which was different in every experiment. The total ejected mass is consistent with the missing mass model.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2]
  1. National Security Technologies, LLC. (NSTec), Mercury, NV (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
1171643
Report Number(s):
DOE/NV/25946--1946
TRN: US1600009
DOE Contract Number:
AC52-06NA25946
Resource Type:
Technical Report
Research Org:
National Security Technologies, LLC. (NSTec), Mercury, NV (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GOLD; PRESSURE RANGE GIGA PA; IMAGES; SURFACES; DENSITY; SHOCK WAVES; X RADIATION; MASS; VELOCITY; TENSILE PROPERTIES; TIME RESOLUTION; COMPRESSION; ROUGHNESS; TIME DEPENDENCE; EXPLOSIVES; SIGNALS; STRESSES; VOIDS ejecta, spall, shock wave compression, gold