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Effect of temperature, strain, and strain rate on the flow stress of aluminum under shock-wave compression
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10.1063/1.4755792
/content/aip/journal/jap/112/7/10.1063/1.4755792
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4755792

Figures

Image of FIG. 1.
FIG. 1.

Evolution of shock wave in pure aluminum and annealed Al 6061 alloy at temperatures 300 K (a), 932 K (b) and 800/851 K (c). The temperature 851 K chosen for the alloy is some 4 K below its solidus temperature . Arrows show the velocities corresponding to the material Hugoniot elastic limit and the spall-related velocity pullback .

Image of FIG. 2.
FIG. 2.

Hugoniot elastic limit (filled triangles), yield stress (diamonds), and the spall strength (circles) as a function of the temperature after experiments with 2-mm samples of pure aluminum. The values determined based on the “spike” values using Eq. (4) are shown by open triangles.

Image of FIG. 3.
FIG. 3.

Maximum steepness of the plastic shock front in aluminum (the same 2-mm samples as in Fig. 2) as a function of initial sample temperature.

Image of FIG. 4.
FIG. 4.

Stress at HEL of pure aluminum as a function of the propagation distance at different initial temperatures (shown next to the corresponding dependence).

Image of FIG. 5.
FIG. 5.

Parameters and of the Eq. (6) for pure aluminum as a function of the initial sample temperature. The dashed lines correspond to the fits (7) and (8).

Image of FIG. 6.
FIG. 6.

Decay of elastic precursor wave in annealed 6061 aluminum at room temperature and 851 K (circles) in comparison with decay in pure aluminum at the same temperatures. The dash-dotted line presents the approximation of the entire volume of the data for various aluminums (Ref. 10).

Image of FIG. 7.
FIG. 7.

The shear stress at HEL as a function of plastic strain rate in pure aluminum shocked from different initial temperatures (shown at the right edge of the plot). Upward and downward triangles correspond to the points for 0.1-mm and 2-mm sample thickness, respectively. The small squares with error bars are the points corresponding to the mid-height of the plastic shock wave.

Image of FIG. 8.
FIG. 8.

Temperature dependences of the shear stress behind the elastic precursor front obtained from the data shown in Fig. 7 at three fixed strain rates.

Image of FIG. 9.
FIG. 9.

Density of mobile dislocations in pure aluminum as a function of plastic strain rate . The straight lines are the dependences calculated using Eq. (12). For clarity, the lines corresponding to the lowest and the highest values of initial temperatures are shown by arrows. The downward triangles correspond to the values just behind the elastic precursor shock in 2-mm samples. As in Fig. 7, the small squares with error bars are the estimates of the density of mobile dislocations corresponding to the maximum strain rate in the plastic shock wave.

Tables

Generic image for table
Table I.

Parameters of planar impact experiments with pure aluminum and 6061 aluminum alloy.

Generic image for table
Table II.

Parameters and α of Eqs. (7) and (8) and factor of Eq. (9) at different temperatures.

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/content/aip/journal/jap/112/7/10.1063/1.4755792
2012-10-03
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of temperature, strain, and strain rate on the flow stress of aluminum under shock-wave compression
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/7/10.1063/1.4755792
10.1063/1.4755792
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