Shear strength of tungsten under shock- and quasi-isentropic loading to 250 GPa
Impact loading experiments have been performed to obtain shock loading and release, as well as quasi-isentropic compression measurements in polycrystalline tungsten to stresses approximating 200 GPa and 250 GPa. A symmetric impact configuration was used to obtain the shock loading and release conditions, while graded density and layered material impactors were used to obtain quasi-isentropic loading. The results of these experiments indicate that the quasi-isentrope lies above the Hugoniot up to /approximately/140 GPa, contrary to expectations based on thermodynamic considerations neglecting effects of inelastic shear deformation. These results show that the dynamic yield strength of tungsten is dependent on the loading rate with the strength being higher for the relatively slower rates of loading along the quasi-isentrope. The pressure dependence of the yield strength is determined nearly independent of temperature effects from quasi-isentroic loading experiments, because the temperature rise in a quasi-isentropic loading experiment is much lower than those associated with shock loading experiments. 28 figs, 2 tabs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5133658
- Report Number(s):
- SAND-88-0306; ON: DE88010104
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic quasi-isentropic compression of tungsten
Dynamic quasi-isentropic compression techniques: applications to aluminum and tungsten