Dynamic quasi-isentropic compression of tungsten
Experiments have been performed both on the powder gun and two-stage light gas gun to obtain quasi-isentropic compression in tungsten to stresses of 78 and 250 GPa, respectively. Quasi-isentropic loading was introduced in the material either by using graded density or layered materials. The former introduces a smooth and a finite rate of loading at the impact interface whereas the latter introduces a series of small multiple shocks into the material. Results of both experiments indicate that the quasi-isentrope lies above the Hugoniot up to approx.140 GPa, contrary to initial expectations. These results suggest that the dynamic yield strength of the material is dependent on the loading rate with the strength of the material being higher for the relatively slower rates of isentropic loading.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6325997
- Report Number(s):
- SAND-87-0622C; CONF-870753-11; ON: DE87011059
- Country of Publication:
- United States
- Language:
- English
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