ISSN 2594-5327
65º Congresso ABM — Vol. 65 , num. 65 (2010)
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Abstract
Large scale molecular-dynamics simulations of plane shock loading in nanophase aluminum nitride are performed to reveal the interplay between shock- induced compaction, structural phase transformation and plastic deformation. The shock profile is calculated for a wide range of particle velocity from 0.2 km/s to 4 km/s. The calculated Hugoniot curves agree well with the experimental one. For lower particle velocity, below 0.8 km/s a single elastic wave is generated. For intermediate particle velocity, between 0.8 km/s and 4 km/s the generated shock wave splits into an elastic precursor and a wurtzite-to-rocksalt structural transformation wave. For particle velocities greater than 4 km/s a single overdriven transformation shock wave is generated above the longitudinal sound speed. These simulation results provide a microscopic view of the dynamic effects of shock impact on single crystal and nanophase high-strength ceramics.
Large scale molecular-dynamics simulations of plane shock loading in nanophase aluminum nitride are performed to reveal the interplay between shock- induced compaction, structural phase transformation and plastic deformation. The shock profile is calculated for a wide range of particle velocity from 0.2 km/s to 4 km/s. The calculated Hugoniot curves agree well with the experimental one. For lower particle velocity, below 0.8 km/s a single elastic wave is generated. For intermediate particle velocity, between 0.8 km/s and 4 km/s the generated shock wave splits into an elastic precursor and a wurtzite-to-rocksalt structural transformation wave. For particle velocities greater than 4 km/s a single overdriven transformation shock wave is generated above the longitudinal sound speed. These simulation results provide a microscopic view of the dynamic effects of shock impact on single crystal and nanophase high-strength ceramics.
Keywords
high strength ceramics, large scale molecular dynamics, shock load
high strength ceramics, large scale molecular dynamics, shock load
How to cite
Branicio, Paulo S.; Srolovitz, David J..
ATOMISTIC MODELLING OF SHOCK LOAD IN NANOPHASE ALUMINUM NITRIDE CERAMICS,
p. 5086-5091.
In: 65º Congresso ABM,
Rio de Janeiro,
2010.
ISSN: 2594-5327, DOI 10.5151/2594-5327-32844
