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Shock response of a model structured nanofoam of Cu
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10.1063/1.4791758
/content/aip/journal/jap/113/6/10.1063/1.4791758
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/6/10.1063/1.4791758
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Partial configuration of a Cu nanofoam created from a [100] single crystal. Shock loading is along the x-axis or [100].

Image of FIG. 2.
FIG. 2.

The xt diagram of for , showing different regimes: unshocked, elastic precursor, plastic wave, and elastic release.

Image of FIG. 3.
FIG. 3.

The shock velocity–particle velocity ( ) plot for elastic and plastic shocks. HEL: Hugoniot elastic limit. (2.5 km s−1) and C 0 (0.16 km s−1) are the intercepts of the straight lines with the vertical axis.

Image of FIG. 4.
FIG. 4.

The stress ( )–specific volume (V) curves obtained from MD simulations, fit to MD results, experiments on porous and full density Cu, 6,31 and predicted compacted Hugoniot.

Image of FIG. 5.
FIG. 5.

(a) The shock pressure–temperature (P–T) plot for different (circles), along with the equilibrium melting curve (solid curve). 32 The dashed curves are guide to the eye. (b) MSDs obtained from the absorbing wall simulations. The numbers in (a) and (b) denote in km s−1.

Image of FIG. 6.
FIG. 6.

Atomic configurations (projected onto the xy-plane) for (a) and t = 100 ps; (b) and t = 50 ps; (c) and t = 37 ps. Color-coding is based on . Shock direction: left right.

Image of FIG. 7.
FIG. 7.

Atomic configurations (projected onto the xy-plane) for and t = 14 ps; (b) and t = 9 ps, showing forward or transverse flows (arrows). Color-coding is based on ux in km s– 1. Shock direction: left right.

Image of FIG. 8.
FIG. 8.

The xt diagram of a 1-nm thick slice cut along the void diameter in the shock direction (AOB in Fig. 1 ) obtained from the 2D binning analysis for , showing internal jetting (circled region), free surface jetting and atomization. Color-coding is based on ux . Shock direction: left right.

Image of FIG. 9.
FIG. 9.

2D stress ( , and in GPa) maps on the xy-plane for and t = 50 ps [cf. Fig. 6(b) ]. Shock direction: left right.

Image of FIG. 10.
FIG. 10.

2D temperature maps on the xy-plane for different shock strengths, showing hotspot formation due to internal jetting. Temperature is in K. Color is saturated above a chosen temperature. Shock direction: left right.

Image of FIG. 11.
FIG. 11.

Atomic configurations (projected onto the xy-plane) showing nanojets at free surfaces for (a) and (b) . Atoms are color-coded with ux in km s−1. Shock direction: left right.

Image of FIG. 12.
FIG. 12.

Jet velocity (a) and jet height (b) for different . The numbers denote in km s−1. The curves for are shifted by −50 ps.

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/content/aip/journal/jap/113/6/10.1063/1.4791758
2013-02-13
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Shock response of a model structured nanofoam of Cu
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/6/10.1063/1.4791758
10.1063/1.4791758
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