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Dislocation mechanics of copper and iron in high rate deformation tests
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10.1063/1.3067764
/content/aip/journal/jap/105/2/10.1063/1.3067764
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/2/10.1063/1.3067764
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The flow stress dependence on strain rate of oxygen-free electronic copper at 0.15 strain and 300 K as reported by Follansbee et al. (Ref. 1) and fitted with asymptotic activation area values at the low and high strain rates.

Image of FIG. 2.
FIG. 2.

Flow stress dependence on strain rate reported by Follansbee et al. (Ref. 1) (triangles) and shock-induced plasticity results reported by Swegle and Grady (Ref. 3) (circles), compared with ZA thermal activation model, the Swegle–Grady empirical relation, and the thermal activation dislocation nucleation model.

Image of FIG. 3.
FIG. 3.

HEL and shock-induced plastic flow stresses for ARMCO iron from Arnold (Ref. 4), in comparison with a number of relationships proposed to fit either slip or deformation twinning aspects of the strain rate dependent behaviors.

Image of FIG. 4.
FIG. 4.

A comprehensive listing of shock-induced HEL and plastic flow stresses for ARMCO iron at different projectile/target thicknesses from Arnold (Ref. 4), in comparison with a number of relationships proposed to fit either slip or deformation twinning aspects of the strain rate dependent behaviors.

Image of FIG. 5.
FIG. 5.

Preshock hardness and shock flow stress measurements, both from Arnold (Ref. 4), along with shock measurements from Rohde (Ref. 13) and Barker and Hollenbach (Ref. 14) plotted against inverse square root of grain size for both slip and deformation twinning.

Image of FIG. 6.
FIG. 6.

The strain rate dependence of the HEL yield stresses of ARMCO iron at different grain sizes, from Arnold (Ref. 4), compared with estimated twinning stress levels and, for a grain size of , with the bcc ZA slip-type equation (Ref. 7).

Image of FIG. 7.
FIG. 7.

The HEL and shock stresses for ARMCO iron of different grain sizes, from Arnold (Ref. 4), in comparison with the differently modeled slip, deformation twinning, and twin nucleation stress predictions.

Image of FIG. 8.
FIG. 8.

A comparison for copper of Hopkinson bar, shock, and isentropic compression stresses (Refs. 1, 3, and 6, respectively) as a function of strain rate and fitted with the proposed empirical and model constitutive relationships proposed for the respective strain rate regimes.

Image of FIG. 9.
FIG. 9.

ICE results for copper, after Jarmakani et al. (Ref. 6), as a function of strain rate, showing linear stress dependence on strain rate in accordance with model prediction for drag-controlled slip (Ref. 24).

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/content/aip/journal/jap/105/2/10.1063/1.3067764
2009-01-21
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dislocation mechanics of copper and iron in high rate deformation tests
http://aip.metastore.ingenta.com/content/aip/journal/jap/105/2/10.1063/1.3067764
10.1063/1.3067764
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