Dynamic yield strength and spall strength measurements under quasi-isentropic loading
In this paper, measurements on the quasi-isentropic compression of tantalum and tungsten to stress levels of 60 GPa and 250 GPa, respectively, are reported. Results of these experiments have been compared to those obtained under shock loading conditions. These experiments have allowed the determination of temperature, pressure, and loading effects on the dynamic yield strength of tungsten and tantalum up to 250 GPa and 80 GPa, respectively. The results show that the dynamic yield strength of tungsten is dependent on the loading rate with the strength being higher for the slower rates of loading along the quasi-isentrope. The pressure dependence of the yield strength of tungsten is determined nearly independent of temperature effects from quasi-isentropic loading experiments to 250 GPa, because the temperature rise in an quasi-isentropic loading experiment is much lower than that associated with shock loading experiments. For tantalum, quasi-isentropic loading experiments up to 60 GPa suggest that the dynamic yield strength is comparable to that determine under shock loading conditions up to 50 GPa. There is significant decrease in the dynamic yield strength for tantalum above 50 GPa under shock loading. A determination of spall strength for tantalum precompressed to 60 GPa under quasi-isentropic loading suggests an increase in spall strength when compared to the strength measurements in a shocked specimen at 20 GPa. 13 refs., 6 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6670233
- Report Number(s):
- SAND-90-0883C; CONF-9008125-3; ON: DE90016105
- Resource Relation:
- Conference: Explomet conference, San Diego, CA (USA), 12-17 Aug 1990
- Country of Publication:
- United States
- Language:
- English
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