Variability in dynamic properties of tantalum : spall, attenuation and load/unload.
A suite of impact experiments was conducted to assess spatial and shot-to-shot variability in dynamic properties of tantalum. Samples had a uniform refined {approx}20 micron grain structure with a strong axisymmetric [111] crystallographic texture. Two experiments performed with sapphire windows (stresses of approximately 7 and 12 GPa) clearly showed elastic-plastic loading and slightly hysteretic unloading behavior. An HEL amplitude of 2.8 GPa (corresponding to Y 1.5 GPa) was observed. Free-surface spall experiments showed clear wave attenuation and spallation phenomena. Here, loading stresses were {approx} 12.5 GPa and various ratios of impactor to target thicknesses were used. Spatial and shot-to-shot variability of the spall strength was {+-} 20%, and of the HEL, {+-} 10%. Experiments conducted with smaller diameter flyer plates clearly showed edge effects in the line and point VISAR records, indicating lateral release speeds of roughly 5 km/s.
- Research Organization:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 969591
- Report Number(s):
- SAND2005-4745C; TRN: US201001%%714
- Resource Relation:
- Conference: Proposed for presentation at the 2005 APS Topical Conference on Shock Compression of Condensed Matter held July 21-August 5, 2005 in Baltimore, MD.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spall response of single-crystal copper
Spall and damage behavior of S200F beryllium