Solid-state experiments at high pressure and strain rate

Kalantar, D. H.; Remington, B. A.; Colvin, J. D.; Mikaelian, Karnig O.; Weber, S. V.; Wiley, L. G.; Wark, J. S.; Loveridge, Andrew J.; Allen, Amani M.; Hauer, A.; Meyers, Marc A.

doi:10.1063/1.874021

Cited by 67 publications

(32 citation statements)

References 21 publications

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“…MD simulations have suggested that GB can melt at lower temperature as compared to the bulk material [2], possibly leading to a decreased yield stress. This could explain recent experimental results on Rayleigh-Taylor (RT) instability growth in a polycrystalline Al [3]. MD simulations of shocks in fluids have been related to predictions by hydrodynamic (HD) calculations [4].…”

Section: Introductionmentioning

confidence: 72%

“…Additional studies including other ordered and disordered boundaries, at several shock pressures, are also needed to evaluate the change in the mechanical properties of the shocked grain boundary, which would be important to estimate its influence on the RT growth [3]. The TTM-MD model will be also used to investigate the role of the electronic heat conduction and the strength of the electron phonon coupling in plastic deformation and melting induced by strong shocks.…”

Section: Discussionmentioning

confidence: 99%

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Molecular Dynamics Simulations of Shocks Including Electronic Heat Conduction and Electron-Phonon Coupling

Ivanov¹,

Zhigilei²,

Bringa³

et al. 2004

AIP Conference Proceedings

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Abstract. Shocks are often simulated using the classical molecular dynamics (MD) method in which the electrons are not included explicitly and the interatomic interaction is described by an effective potential. As a result, the fast electronic heat conduction in metals and the coupling between the lattice vibrations and the electronic degrees of freedom can not be represented. Under conditions of steep temperature gradients that can form near the shock front, however, the electronic heat conduction can play an important part in redistribution of the thermal energy in the shocked target. We present the first atomistic simulation of a shock propagation including the electronic heat conduction and electronphonon coupling. The computational model is based on the two-temperature model (TTM) that describes the time evolution of the lattice and electron temperatures by two coupled non-linear differential equations. In the combined TTM-MD method, MD substitutes the TTM equation for the lattice temperature. Simulations are performed with both MD and TTM-MD models for an EAM Al target shocked at 300 kbar. The target includes a tilt grain boundary, which provides a region where shock heating is more pronounced and, therefore, the effect of the electronic heat conduction is expected to be more important. We find that the differences between the predictions of the MD and TTM-MD simulations are significantly smaller as compared to the hydrodynamics calculations performed at similar conditions with and without electronic heat conduction.

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Section: Introductionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Molecular Dynamics Simulations of Shocks Including Electronic Heat Conduction and Electron-Phonon Coupling

Ivanov¹,

Zhigilei²,

Bringa³

et al. 2004

AIP Conference Proceedings

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“…This method is based on the pioneering work by Barnes et al [12,13] who measured the growth of a sinusoidal perturbation in the surface of a flat plate smoothly accelerated by expanding detonation products and correlated this growth with the shear strength of the material. Nowadays, this technique is playing an increase role in the experimental evaluation of the yield strength and it has been developed by accelerating the solid by means of laser facilities [14][15][16][17][18][19]. Since the hydrodynamic instabilities in solids impose limitations in, for example, the implementation of the inertial confinement fusion and other important technological processes, an intense research activity has been developed in this field directed to understand and avoid such instabilities.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Dynamic Yield Strength of Solids by Means of the Richtmyer-Meshkov Instability

López¹,

Piriz²,

Tahir³

2014

TOPPJ

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An experimental procedure to evaluate the dynamic yield strength of solids based on measuring the growth of the Richtmyer-Meshkov instability is proposed. To induce the Richtmyer-Meshkov instability in solids a shock is needed, so this technique is complementary to the one based on the Rayleigh-Taylor instability that is achieved by means of an isentropic compression. We have presented an analytical model elsewhere, validated against extensive finite element simulations, that describes the evolution of the Richtmyer-Meshkov instability in elastoplastic solids. The model shows that after reaching a maximum value, the time evolution of the perturbation at the solid interface remains oscillating. The maximum perturbation amplitude depends essentially on the yield strength of the material. The proposed technique needs only one experimental measurement that is related, through the scaling law given by the analytical model, to the yield strength of the material.

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“…Therefore, experiments and simulations at different length and time scales have been conducted to develop more insight into the deformation process. For instance, Kalantar et al [7] used intense laser beams to shock load copper single crystals and polycrystals to study their response at ultra-high strain rates. The effect of temperature on the dynamic tensile strength of aluminium single crystals was investigated by Kanel et al [8].…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates

Chandra

Samal

Chavan

et al. 2015

Plasticity and Mechanics of Defects

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A hierarchical multiscale modeling approach is presented to predict the mechanical response of dynamically deformed (1100 s −1 −4500 s −1 ) copper single crystal in two different crystallographic orientations. An attempt has been made to bridge the gap between nano-, micro-and meso-scales. In view of this, Molecular Dynamics (MD) simulations at nanoscale are performed to quantify the drag coefficient for dislocations which has been exploited in Dislocation Dynamics (DD) regime at the microscale. Discrete dislocation dynamics simulations are then performed to calculate the hardening parameters required by the physics based Crystal Plasticity (CP) model at the mesoscale. The crystal plasticity model employed is based on thermally activated theory for plastic flow. Crystal plasticity simulations are performed to quantify the mechanical response of the copper single crystal in terms of stressstrain curves and shape changes under dynamic loading. The deformation response obtained from CP simulations is in good agreement with the experimental data.

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Solid-state experiments at high pressure and strain rate

Cited by 67 publications

References 21 publications

Molecular Dynamics Simulations of Shocks Including Electronic Heat Conduction and Electron-Phonon Coupling

Molecular Dynamics Simulations of Shocks Including Electronic Heat Conduction and Electron-Phonon Coupling

Evaluation of the Dynamic Yield Strength of Solids by Means of the Richtmyer-Meshkov Instability

Multiscale modeling of plasticity in a copper single crystal deformed at high strain rates

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