Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities
Апстракт
Molecular-dynamics simulations of the
classic Taylor experiment are performed to investigate
some general trends of impact fragmentation at ultrahigh
striking velocities. The striking velocities of flatended,
monocrystalline, nanoscale pillars (nanoprojectiles)
range from 0.34 km/s (Mach 1) to 30 km/s to
explore qualitative effects on the fragment mass
distribution. These atomistic simulations offer insight
into evolution of the fragment distribution and its
dependence upon the striking velocity. According to
the simulation results, distribution of the fragment
masses following hypervelocity impacts of energy
sufficient to ensure that the fragmentation problem is
statistically well posed, is well represented by the
bilinear (bimodal) exponential distribution commonly
observed during high-energy homogeneous fragmentation
events. At more moderate striking velocities, a
mixing of fragments from different fragmentation
intensity events—that is, the more pronounced statist...ical
heterogeneity—results in the distribution of
fragment masses that appears to follow the trilinear
(trimodal) exponential distribution due to the occurrence
of a large-fragment tail in addition to the bilinear
exponential part. The maximum fragment mass is
studied from the standpoint of the striking velocity as
well as a set of state parameters: the instantaneous
kinetic temperature and the selected stress and strain
invariants; corresponding phenomenological relationships
are suggested for the investigated hypervelocity
impact range.
Кључне речи:
Impact fragmentation / Taylor test / Bilinear exponential distribution / Hypervelocity impact / Extreme loadsИзвор:
Meccanica, 2015, 50, 9, 2353-2367Издавач:
- Springer Nature
Институција/група
Institut za multidisciplinarna istraživanjaTY - JOUR AU - Mastilović, Sreten PY - 2015 UR - http://rimsi.imsi.bg.ac.rs/handle/123456789/1590 AB - Molecular-dynamics simulations of the classic Taylor experiment are performed to investigate some general trends of impact fragmentation at ultrahigh striking velocities. The striking velocities of flatended, monocrystalline, nanoscale pillars (nanoprojectiles) range from 0.34 km/s (Mach 1) to 30 km/s to explore qualitative effects on the fragment mass distribution. These atomistic simulations offer insight into evolution of the fragment distribution and its dependence upon the striking velocity. According to the simulation results, distribution of the fragment masses following hypervelocity impacts of energy sufficient to ensure that the fragmentation problem is statistically well posed, is well represented by the bilinear (bimodal) exponential distribution commonly observed during high-energy homogeneous fragmentation events. At more moderate striking velocities, a mixing of fragments from different fragmentation intensity events—that is, the more pronounced statistical heterogeneity—results in the distribution of fragment masses that appears to follow the trilinear (trimodal) exponential distribution due to the occurrence of a large-fragment tail in addition to the bilinear exponential part. The maximum fragment mass is studied from the standpoint of the striking velocity as well as a set of state parameters: the instantaneous kinetic temperature and the selected stress and strain invariants; corresponding phenomenological relationships are suggested for the investigated hypervelocity impact range. PB - Springer Nature T2 - Meccanica T1 - Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities EP - 2367 IS - 9 SP - 2353 VL - 50 DO - 10.1007/s11012-015-0159-3 ER -
@article{ author = "Mastilović, Sreten", year = "2015", abstract = "Molecular-dynamics simulations of the classic Taylor experiment are performed to investigate some general trends of impact fragmentation at ultrahigh striking velocities. The striking velocities of flatended, monocrystalline, nanoscale pillars (nanoprojectiles) range from 0.34 km/s (Mach 1) to 30 km/s to explore qualitative effects on the fragment mass distribution. These atomistic simulations offer insight into evolution of the fragment distribution and its dependence upon the striking velocity. According to the simulation results, distribution of the fragment masses following hypervelocity impacts of energy sufficient to ensure that the fragmentation problem is statistically well posed, is well represented by the bilinear (bimodal) exponential distribution commonly observed during high-energy homogeneous fragmentation events. At more moderate striking velocities, a mixing of fragments from different fragmentation intensity events—that is, the more pronounced statistical heterogeneity—results in the distribution of fragment masses that appears to follow the trilinear (trimodal) exponential distribution due to the occurrence of a large-fragment tail in addition to the bilinear exponential part. The maximum fragment mass is studied from the standpoint of the striking velocity as well as a set of state parameters: the instantaneous kinetic temperature and the selected stress and strain invariants; corresponding phenomenological relationships are suggested for the investigated hypervelocity impact range.", publisher = "Springer Nature", journal = "Meccanica", title = "Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities", pages = "2367-2353", number = "9", volume = "50", doi = "10.1007/s11012-015-0159-3" }
Mastilović, S.. (2015). Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities. in Meccanica Springer Nature., 50(9), 2353-2367. https://doi.org/10.1007/s11012-015-0159-3
Mastilović S. Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities. in Meccanica. 2015;50(9):2353-2367. doi:10.1007/s11012-015-0159-3 .
Mastilović, Sreten, "Impact fragmentation of nanoscale projectiles at ultrahigh striking velocities" in Meccanica, 50, no. 9 (2015):2353-2367, https://doi.org/10.1007/s11012-015-0159-3 . .