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Title: Modeling Laser-Driven High-Rate Plasticity in BCC Lead

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1389999
Report Number(s):
LLNL-PROC-737634
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 20th Biennial APS Conference on Shock Compression of Condensed Matter, St. Louis, MO, United States, Jul 09 - Jul 14, 2017
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Rudd, R E, Yang, L, Powell, P D, Graham, P, Arsenlis, A, Cavallo, R M, McNaney, J M, Prisbrey, S T, Remington, B A, Swift, D C, Wehrenberg, C E, and Park, H S. Modeling Laser-Driven High-Rate Plasticity in BCC Lead. United States: N. p., 2017. Web.
Rudd, R E, Yang, L, Powell, P D, Graham, P, Arsenlis, A, Cavallo, R M, McNaney, J M, Prisbrey, S T, Remington, B A, Swift, D C, Wehrenberg, C E, & Park, H S. Modeling Laser-Driven High-Rate Plasticity in BCC Lead. United States.
Rudd, R E, Yang, L, Powell, P D, Graham, P, Arsenlis, A, Cavallo, R M, McNaney, J M, Prisbrey, S T, Remington, B A, Swift, D C, Wehrenberg, C E, and Park, H S. 2017. "Modeling Laser-Driven High-Rate Plasticity in BCC Lead". United States. doi:. https://www.osti.gov/servlets/purl/1389999.
@article{osti_1389999,
title = {Modeling Laser-Driven High-Rate Plasticity in BCC Lead},
author = {Rudd, R E and Yang, L and Powell, P D and Graham, P and Arsenlis, A and Cavallo, R M and McNaney, J M and Prisbrey, S T and Remington, B A and Swift, D C and Wehrenberg, C E and Park, H S},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 8
}

Conference:
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  • Previously developed constitutive models and solution algorithms for anisotropic elastoplastic material strength are implemented in the two-dimensional MESA hydrodynamics code. Quadratic yield functions fitted from polycrystal simulations for a metallic hexagonal-close-packed structure are utilized. An associative flow strength formulation incorporating these yield functions is solved using a geometric normal return method. A stretching rod problem is selected to investigate the effects of material anisotropy on a tensile plastic instability (necking). The rod necking rate and topology are compared for MESA simulations performed for both isotropic and anisotropic cases utilizing the Mechanical Threshold Stress flow stress model.
  • Previously developed constitutive models and solution algorithms for anisotropic elastoplastic material strength are implemented in the two dimensional MESA hydrodynamics code. Quadratic yield functions fitted from polycrystal simulations for a metallic hexagonal-close-packed structure are utilized. An associative flow strength formulation incorporating these yield functions is solved using a geometric normal return method. A stretching rod problem is selected to investigate the effects of material anisotropy on a tensile plastic instability (necking). The rod necking rate and topology are compared for MESA simulations performed for both isotropic and anisotropic cases utilizing the elastic-perfectly-plastic and the Mechanical Threshold Stress flow stress models.
  • Previously developed constitutive models and solution algorithms for anisotropic elastoplastic material strength have been implemented in the three-dimensional Conejo hydrodynamics code. The anisotropic constitutive modeling is posed in an unrotated material frame of reference using the theorem of polar decomposition to obtain rigid body rotation. Continuous quadratic yield functions fitted from polycrystal simulations for a metallic hexagonal-close-packed structure were utilized. Simple rectangular shear problems, R-value problems, and Taylor cylinder impact data were used to verify and validate the implementation of the anisotropic model. A stretching rod problem (involving large strain and high strain-rate deformation) was selected to investigate the effectsmore » of material anisotropy. Conejo simulations of rod topology were compared for two anisotropic cases.« less
  • Laser-based experiments are being developed to study the response of solids under high pressure loading. Diagnostic techniques that have been applied include dynamic x-ray diffraction, VISAR wave profile measurements, and post-shock recovery and analysis. These techniques are presented with some results from shocked Si, Al, and Cu experiments.
  • The results of two related theoretical investigations for large-scale computations of elasto-plastic deformations at ultrahigh strain rates are summarized in this paper. The first effort concerns the development of a phenomenological constitutive model for finite deformation elastoplasticity which includes the effects of thermal softening, strain hardening and rate-dependency, and the incorporation of this model in the large-scale explicit finite-element code PRONTO 2D. The second effort involves the investigation of localized deformations and shear banding at high strain rates. It is shown that the constitutive model considered, together with standard quadrilateral finite elements with one point integration (piece-wise constant strain andmore » stress fields), can nicely produce the observed intense localized deformations without recourse to any special elements. The results are illustrated in terms of the shear localization observed in uniaxial extension and the void collapse in uniaxial compression. In addition, the effect of noncoaxiality of the plastic strain rate and the stress tensor is included in the model, and its influence on strain localization at high strain rates is investigated.« less