Verification of experimental dynamic strength methods with atomistic ramp-release simulations

Moore, Alexander P.; Brown, Justin L.; Lim, Hojun; Lane, J. Matthew D.

doi:10.1103/PhysRevMaterials.2.053601

Verification of experimental dynamic strength methods with atomistic ramp-release simulations

Journal Article · Fri May 04 00:00:00 EDT 2018 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.2.053601· OSTI ID:1444091

Moore, Alexander P. ^[1]; Brown, Justin L. ^[1]; Lim, Hojun ^[1]; Lane, J. Matthew D. ^[1]

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

Material strength and moduli can be determined from dynamic high-pressure ramp-release experiments using an indirect method of Lagrangian wave profile analysis of surface velocities. This method, termed self-consistent Lagrangian analysis (SCLA), has been difficult to calibrate and corroborate with other experimental methods. Using nonequilibrium molecular dynamics, we validate the SCLA technique by demonstrating that it accurately predicts the same bulk modulus, shear modulus, and strength as those calculated from the full stress tensor data, especially where strain rate induced relaxation effects and wave attenuation are small. We show here that introducing a hold in the loading profile at peak pressure gives improved accuracy in the shear moduli and relaxation-adjusted strength by reducing the effect of wave attenuation. When rate-dependent effects coupled with wave attenuation are large, we find that Lagrangian analysis overpredicts the maximum unload wavespeed, leading to increased error in the measured dynamic shear modulus. Furthermore, these simulations provide insight into the definition of dynamic strength, as well as a plausible explanation for experimental disagreement in reported dynamic strength values.

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:: 1444091

Alternate ID(s):: OSTI ID: 1436002

Report Number(s):: SAND--2018-5914J; 663695

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 5 Vol. 2; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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