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Molecular dynamics study on the failure modes of aluminium under decaying shock loading
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10.1063/1.4802671
/content/aip/journal/jap/113/16/10.1063/1.4802671
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/16/10.1063/1.4802671
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Initial configuration of the simulated sample. The loading process is generated by impacting target (105 a) with a flyer (15 a).

Image of FIG. 2.
FIG. 2.

Formation process of the loading profile (particle velocity vz ) (a), and pressure profiles pz with different impacting velocities near the right-side surface.

Image of FIG. 3.
FIG. 3.

Microscopic morphology evolution of failure at the impact velocity 1.5 km/s. Typical states of spall damage, including voids nucleation, growth, and confluence, are all presented.

Image of FIG. 4.
FIG. 4.

Evolution of longitudinal pressure profile (a) and evolution of temperature profile (b) at the impact velocity 1.5 km/s. The dotted horizontal line is the melting point at zero pressure from the potential model 28 used in our work.

Image of FIG. 5.
FIG. 5.

Microscopic morphology evolution of failure at the impact velocity 5.0 km/s. The atoms are colored by their potential energy.

Image of FIG. 6.
FIG. 6.

Evolution of longitudinal pressure profile (a) and evolution of temperature profile (b) at the impact velocity 5.0 km/s.

Image of FIG. 7.
FIG. 7.

3D graph of failure before melting, for the cases of impact velocities from 1.0 to 2.0 km/s. The solid spall layers are presented.

Image of FIG. 8.
FIG. 8.

3D graph of failure after melting, for the impact velocities from 3.5 to 6.0 km/s. Atom or cluster ejecta, melted spall layer, and fragment ejecta are all presented.

Image of FIG. 9.
FIG. 9.

Variation of the failure depth with the impact velocity. Before melting, the failure depth increases linearly with the impact velocity; after melting, the increase of failure depth deflects this linear law.

Image of FIG. 10.
FIG. 10.

(a) Evolution of free-surface velocity with time for different impacting velocities and (b) variation of fracture strength and strain rate from the free-surface velocity history within acoustic approximation.

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/content/aip/journal/jap/113/16/10.1063/1.4802671
2013-04-25
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Molecular dynamics study on the failure modes of aluminium under decaying shock loading
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/16/10.1063/1.4802671
10.1063/1.4802671
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