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Shock wave loading and spallation of copper bicrystals with asymmetric tilt grain boundaries
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View: Figures


Image of FIG. 1.
FIG. 1.

Atomic configurations at for shock loading with different , projected along the tilt axis (i.e., onto the -plane). Shock loading direction (the -direction) is along for grain 1 and for grain 2. The dashed line denotes a GB. , , and for (a)–(c), respectively. Color coding is based on .

Image of FIG. 2.
FIG. 2.

Atom configuration in the shocked region at for . Centrosymmetry parameter is calculated for each atom, and only non-fcc atoms are shown. Dashed arrow: shock direction. Also see Fig. 1(b).

Image of FIG. 3.
FIG. 3.

1D analyses: (a) The target free surface velocity histories, , for different (numbers; in ). (b) The stress profiles at at the corresponding .

Image of FIG. 4.
FIG. 4.

1D analysis of the tensile stress profiles at , 18 ps, and 18 ps for , , and , respectively.

Image of FIG. 5.
FIG. 5.

2D analyses of stress and temperature profiles, for at . (a) , (b) , and (c) .

Image of FIG. 6.
FIG. 6.

(a) A 2D projection of the displacement field, , for at . Also see Fig. 1(c). (b) corresponds to the region enclosed by the square in (a). The long-dashed line denotes a GB.

Image of FIG. 7.
FIG. 7.

Dynamics of the target free surface after the shock breakout, projected along . Color-coding is based on potential energy, and only the atoms near the free surface (with high potential energy) are plotted. .

Image of FIG. 8.
FIG. 8.

Snapshots of void nucleation and growth at for (a), and at for (b). Only surface atoms are plotted.

Image of FIG. 9.
FIG. 9.

A snapshot of highly shear-deformed regions at for . Only atoms with are shown. Some void nucleation sites are indicated with circles.

Image of FIG. 10.
FIG. 10.

2D profiles of hydrostatic pressure (a) and temperature (b) at for . Dashed line: GB; circled areas: void nucleation sites. Also see Fig. 9.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Shock wave loading and spallation of copper bicrystals with asymmetric Σ3⟨110⟩ tilt grain boundaries