Details

Autor(en) / Beteiligte

• Millett, J. C. F.
• Avraam, P.
• Whiteman, G.
• Chapman, D. J.
• Case, S.

Titel

The role of orientation on the shock response of single crystal tantalum

Ist Teil von

• Journal of applied physics, 2020-07, Vol.128 (3)

Ort / Verlag

Melville: American Institute of Physics

Erscheinungsjahr

2020

Quelle

American Institute of Physics (AIP) Journals

Beschreibungen/Notizen

• The response of single crystalline tantalum to one-dimensional shock loading has been investigated as a function of crystalline orientation to the loading axis. Results show that this has a significant effect, particularly on the Hugoniot elastic limit (HEL). [100] and [111] HELs are near identical with the [110] HEL having the lowest strength. This is contrary to predictions obtained by applying the Schmid factor analysis, where the ordering was expected to be (highest strength first) [111], [110], with the [100] orientation being the softest. Adopting a more appropriate model based on uniaxial strain conditions, as was previously done successfully for FCC aluminum and copper, did not rationalize our observations. We show that a non-Schmid effective stress model, incorporating twinning/anti-twinning asymmetry, has much greater success in reproducing the experimental relative HELs magnitudes. Using this model, we make a quantitative estimation of the magnitude of non-Schmid effects and compare these to equivalent low temperature, quasi-static estimates from the literature.