Constitutive law for thermally-activated plasticity of recrystallized tungsten

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Constitutive law for thermally-activated plasticity of recrystallized tungsten. / Zinovev, Aleksandr; Terentyev, Dmitry; Dubinko, Andrii; Delannay, L.

In: Journal of Nuclear Materials, Vol. 496, 03.10.2017, p. 658-332.

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@article{d87629b3928848b99f5828a7fc14e236,
title = "Constitutive law for thermally-activated plasticity of recrystallized tungsten",
abstract = "A physically-based constitutive law relevant for ITER-specification tungsten grade in as-recrystallized state is proposed. The material demonstrates stages III and IV of the plastic deformation, in which hardening rate does not drop to zero with the increase of applied stress. Despite the classical Kocks- Mecking model, valid at stage III, the strain hardening asymptotically decreases resembling a hyperbolic function. The material parameters are fitted by relying on tensile test data and by requiring that the strain and stress at the onset of diffuse necking (uniform elongation and ultimate tensile strength correspondingly) as well as the yield stress be reproduced. The model is then validated in the temperature range 300e600 C with the help of finite element analysis of tensile tests which confirms the reproducibility of the experimental engineering curves up to the onset of diffuse necking, beyond which the development of ductile damage accelerates the material failure. This temperature range represents the low temperature application window for tungsten as divertor material in fusion reactor ITER.",
keywords = "recrystallized W, low temperature, deformation , stage IV, model validation, finite element analaysis",
author = "Aleksandr Zinovev and Dmitry Terentyev and Andrii Dubinko and L. Delannay",
note = "Score=10",
year = "2017",
month = "10",
day = "3",
doi = "10.1016/j.jnucmat.2017.09.044",
language = "English",
volume = "496",
pages = "658--332",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Constitutive law for thermally-activated plasticity of recrystallized tungsten

AU - Zinovev, Aleksandr

AU - Terentyev, Dmitry

AU - Dubinko, Andrii

AU - Delannay, L.

N1 - Score=10

PY - 2017/10/3

Y1 - 2017/10/3

N2 - A physically-based constitutive law relevant for ITER-specification tungsten grade in as-recrystallized state is proposed. The material demonstrates stages III and IV of the plastic deformation, in which hardening rate does not drop to zero with the increase of applied stress. Despite the classical Kocks- Mecking model, valid at stage III, the strain hardening asymptotically decreases resembling a hyperbolic function. The material parameters are fitted by relying on tensile test data and by requiring that the strain and stress at the onset of diffuse necking (uniform elongation and ultimate tensile strength correspondingly) as well as the yield stress be reproduced. The model is then validated in the temperature range 300e600 C with the help of finite element analysis of tensile tests which confirms the reproducibility of the experimental engineering curves up to the onset of diffuse necking, beyond which the development of ductile damage accelerates the material failure. This temperature range represents the low temperature application window for tungsten as divertor material in fusion reactor ITER.

AB - A physically-based constitutive law relevant for ITER-specification tungsten grade in as-recrystallized state is proposed. The material demonstrates stages III and IV of the plastic deformation, in which hardening rate does not drop to zero with the increase of applied stress. Despite the classical Kocks- Mecking model, valid at stage III, the strain hardening asymptotically decreases resembling a hyperbolic function. The material parameters are fitted by relying on tensile test data and by requiring that the strain and stress at the onset of diffuse necking (uniform elongation and ultimate tensile strength correspondingly) as well as the yield stress be reproduced. The model is then validated in the temperature range 300e600 C with the help of finite element analysis of tensile tests which confirms the reproducibility of the experimental engineering curves up to the onset of diffuse necking, beyond which the development of ductile damage accelerates the material failure. This temperature range represents the low temperature application window for tungsten as divertor material in fusion reactor ITER.

KW - recrystallized W

KW - low temperature

KW - deformation

KW - stage IV

KW - model validation

KW - finite element analaysis

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/26871076

U2 - 10.1016/j.jnucmat.2017.09.044

DO - 10.1016/j.jnucmat.2017.09.044

M3 - Article

VL - 496

SP - 658

EP - 332

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -

ID: 3368142