Strain-rate dependence of ramp-wave evolution and strength in tantalum

Lane, J. Matthew D.; Foiles, Stephen M.; Lim, Hojun; Brown, Justin L.

doi:10.1103/PhysRevB.94.064301

Strain-rate dependence of ramp-wave evolution and strength in tantalum

Journal Article · Thu Aug 25 04:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.064301· OSTI ID:1398378

Lane, J. Matthew D. ^[1]; Foiles, Stephen M. ^[1]; Lim, Hojun ^[1]; Brown, Justin L. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

We have conducted molecular dynamics (MD) simulations of quasi-isentropic ramp-wave compression to very high pressures over a range of strain rates from 10¹¹ down to 10⁸ 1/s. Using scaling methods, we collapse wave profiles from various strain rates to a master profile curve, which shows deviations when material response is strain-rate dependent. Thus, we can show with precision where, and how, strain-rate dependence affects the ramp wave. We find that strain rate affects the stress-strain material response most dramatically at strains below 20%, and that above 30% strain the material response is largely independent of strain rate. We show good overall agreement with experimental stress-strain curves up to approximately 30% strain, above which simulated response is somewhat too stiff. We postulate that this could be due to our interatomic potential or to differences in grain structure and/or size between simulation and experiment. Strength is directly measured from per-atom stress tensor and shows significantly enhanced elastic response at the highest strain rates. As a result, this enhanced elastic response is less pronounced at higher pressures and at lower strain rates.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1398378

Alternate ID(s):: OSTI ID: 1306695

Report Number(s):: SAND2017-0790J; 656110

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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