Molecular dynamics simulations of shock-induced plasticity in tantalum

被引：80

作者：

Tramontina, Diego ^{[1
,2
]}

Erhart, Paul ^{[3
,12
]}

Germann, Timothy ^{[4
]}

Hawreliak, James ^{[3
]}

Higginbotham, Andrew ^{[5
]}

Park, Nigel ^{[6
]}

Ravelo, Ramon ^{[4
,7
,8
]}

Stukowski, Alexander ^{[9
]}

Suggit, Mathew ^{[5
]}

Tang, Yizhe ^{[10
]}

Wark, Justin ^{[5
]}

Bringa, Eduardo ^{[2
,11
]}

机构：

[1] Agencia Nacl Promoc Cient & Tecnol, Caba, Argentina

[2] Univ Nacl Cuyo, Inst Ciencias Basicas, RA-5500 Mendoza, Argentina

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[6] AWE, Mat Modeling Grp, Reading RG7 4PR, Berks, England

[7] Univ Texas El Paso, Dept Phys, El Paso, TX 79968 USA

[8] Univ Texas El Paso, Mat Res Inst, El Paso, TX 79968 USA

[9] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[10] Johns Hopkins Univ, Baltimore, MD 21218 USA

[11] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

[12] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden

来源：

HIGH ENERGY DENSITY PHYSICS | 2014年 / 10卷

基金：

瑞典研究理事会; 英国工程与自然科学研究理事会;

关键词：

Tantalum; Molecular dynamics; Shocks; VOID GROWTH; FCC METALS; BCC METALS; DEFORMATION; COMPRESSION; ORIENTATION; INITIATION; FRACTURE; COPPER; MODEL;

D O I：

10.1016/j.hedp.2013.10.007

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We present Non-Equilibrium Molecular Dynamics (NEMD) simulations of shock wave compression along the [001] direction in monocrystalline Tantalum, including pre-existing defects which act as dislocation sources. We use a new Embedded Atom Model (EAM) potential and study the nucleation and evolution of dislocations as a function of shock pressure and loading rise time. We find that the flow stress and dislocation density behind the shock front depend on strain rate. We find excellent agreement with recent experimental results on strength and recovered microstructure, which goes from dislocations to a mixture of dislocations and twins, to twinning dominated response, as the shock pressure increases. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：9 / 15

页数：7

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