Verification of experimental dynamic strength methods with atomistic ramp-release simulations
Abstract
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.
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1444091
- Alternate Identifier(s):
- OSTI ID: 1436002
- Report Number(s):
- SAND-2018-5914J
Journal ID: ISSN 2475-9953; PRMHAR; 663695; TRN: US1900970
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 2; Journal Issue: 5; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Moore, Alexander P., Brown, Justin L., Lim, Hojun, and Lane, J. Matthew D. Verification of experimental dynamic strength methods with atomistic ramp-release simulations. United States: N. p., 2018.
Web. doi:10.1103/PhysRevMaterials.2.053601.
Moore, Alexander P., Brown, Justin L., Lim, Hojun, & Lane, J. Matthew D. Verification of experimental dynamic strength methods with atomistic ramp-release simulations. United States. https://doi.org/10.1103/PhysRevMaterials.2.053601
Moore, Alexander P., Brown, Justin L., Lim, Hojun, and Lane, J. Matthew D. Fri .
"Verification of experimental dynamic strength methods with atomistic ramp-release simulations". United States. https://doi.org/10.1103/PhysRevMaterials.2.053601. https://www.osti.gov/servlets/purl/1444091.
@article{osti_1444091,
title = {Verification of experimental dynamic strength methods with atomistic ramp-release simulations},
author = {Moore, Alexander P. and Brown, Justin L. and Lim, Hojun and Lane, J. Matthew D.},
abstractNote = {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.},
doi = {10.1103/PhysRevMaterials.2.053601},
journal = {Physical Review Materials},
number = 5,
volume = 2,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2018},
month = {Fri May 04 00:00:00 EDT 2018}
}
Web of Science
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