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Attenuation of shock waves propagating through nano-structured porous materials
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10.1063/1.4811720
/content/aip/journal/pof2/25/7/10.1063/1.4811720
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4811720

Figures

Image of FIG. 1.
FIG. 1.

Schematic view of atomistic shock tube model.

Image of FIG. 2.
FIG. 2.

Flow domain with 2D bins.

Image of FIG. 3.
FIG. 3.

(a) Schematic view of free standing straight poles (Case 1). (b) Side view of free-standing porous structure with poles normal to flow direction. (c) Schematic view of porous material structure with straight poles attached to solid structure (Case 2). (d) Schematic view of porous material structure with graded poles attached to solid structure (Case 3.1). (e) Mixed poles geometry. Yellow poles are replaced with straight poles (Case 3.2); yellow poles replaced by decreasing thickness poles as illustrated in figure 3.6 (Case 3.3). (f) Schematic view of porous material structure with mixed geometry graded poles attached to solid structure (Case 3.3).

Image of FIG. 4.
FIG. 4.
Image of FIG. 5.
FIG. 5.

Continuity of normal stress at the gas solid interface during shock impact.

Image of FIG. 6.
FIG. 6.

Instantaneous energy transmitted to end wall particles at different values of the initial gas density.

Image of FIG. 7.
FIG. 7.

Effect of the piston velocity on the instantaneous change in energy of the solid wall.

Image of FIG. 8.
FIG. 8.

(a) Pressure contours in the gas flow domain with free-standing porous structure with 96% porosity. Scaling as in fig. 4(b) . (b) Pressure contours in the gas flow domain with free-standing porous structure with 80% porosity. Scaling as in fig. 4(b) . (c) Pressure contours in the gas flow domain with free-standing porous structure with 66% porosity. Scaling as in fig. 4(b) .

Image of FIG. 9.
FIG. 9.

Effects of porosity on the gas pressure at the frontal and back area of the porous section during shock impact.

Image of FIG. 10.
FIG. 10.

Pole orientation effect on the gas pressure during shock impact at front and back sections.

Image of FIG. 11.
FIG. 11.

(a) Pressure profiles in the gas channel with shock impacting a porous material structure with poles attached to end wall with 96% porosity. Scaling as in Fig. 4(b) . (b) Pressure profiles in the gas channel with shock impacting a porous material structure with poles attached to end wall with 80% porosity. Scaling as in fig. 4(b) . (c) Pressure profiles in the gas channel with shock impacting a porous material structure with poles attached to end wall with 66% porosity. Scaling as in fig. 4(b) . (d) Pressure profiles in the gas channel with shock impacting a porous material structure with poles attached to end wall with 52% porosity. Scaling as in fig. 4(b) .

Image of FIG. 12.
FIG. 12.

Variation of the change in energy of solid wall particles during shock impact on porous structures of different values of porosity.

Image of FIG. 13.
FIG. 13.

(a) Pressure contours as a function of time in Case 3.1 with conical poles increasing in thickness. Scaling as in fig. 4(b) . (b) Pressure contours as a function of time in Case 3.2 with conical and straight poles increasing in thickness. Scaling as in fig. 4(b) . (c) Pressure contours as a function of time in Case 3.3 with conical increasing and decreasing pole thickness. Scaling as in fig. 4(b) .

Image of FIG. 14.
FIG. 14.

Comparison of energy of solid wall particles in the cases investigated here.

Tables

Generic image for table
Table I.

GEAM and physical parameters for various metals.

Generic image for table
Table II.

Reference values for dimensionless derived quantities.

Generic image for table
Table III.

Summary of investigated cases.

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/content/aip/journal/pof2/25/7/10.1063/1.4811720
2013-07-10
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Attenuation of shock waves propagating through nano-structured porous materials
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4811720
10.1063/1.4811720
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