Penetration scaling in atomistic simulations of hypervelocity impact
We present atomistic molecular dynamics simulations of the impact of copper nano particles at 5 km s -1 on copper films ranging in thickness from from 0.5 to 4 times the projectile diameter. We access both penetration and cratering regimes with final cratering morphologies sh...
| المؤلفون الرئيسيون: | , , , |
|---|---|
| التنسيق: | Journal article |
| اللغة: | English |
| منشور في: |
2011
|
| _version_ | 1826268098002419712 |
|---|---|
| author | Higginbotham, A Bringa, E Taylor, E Graham, G |
| author_facet | Higginbotham, A Bringa, E Taylor, E Graham, G |
| author_sort | Higginbotham, A |
| collection | OXFORD |
| description | We present atomistic molecular dynamics simulations of the impact of copper nano particles at 5 km s -1 on copper films ranging in thickness from from 0.5 to 4 times the projectile diameter. We access both penetration and cratering regimes with final cratering morphologies showing considerable similarity to experimental impacts on both micron and millimetre scales. Both craters and holes are formed from a molten region, with relatively low defect densities remaining after cooling and recrystallisation. Crater diameter and penetration limits are compared to analytical scaling models: in agreement with some models we find the onset of penetration occurs for 1.0 < f/d p < 1.5, where f is the film thickness and d p is the projectile diameter. However, our results for the hole size agree well with scaling laws based on macroscopic experiments providing enhanced strength of a nano-film that melts completely at the impact region is taken into account. © 2010 Elsevier Ltd. All rights reserved. |
| first_indexed | 2024-03-06T21:04:22Z |
| format | Journal article |
| id | oxford-uuid:3bf3c39e-e725-4bcb-8b26-88b3da71145c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T21:04:22Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | oxford-uuid:3bf3c39e-e725-4bcb-8b26-88b3da71145c2022-03-26T14:10:39ZPenetration scaling in atomistic simulations of hypervelocity impactJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3bf3c39e-e725-4bcb-8b26-88b3da71145cEnglishSymplectic Elements at Oxford2011Higginbotham, ABringa, ETaylor, EGraham, GWe present atomistic molecular dynamics simulations of the impact of copper nano particles at 5 km s -1 on copper films ranging in thickness from from 0.5 to 4 times the projectile diameter. We access both penetration and cratering regimes with final cratering morphologies showing considerable similarity to experimental impacts on both micron and millimetre scales. Both craters and holes are formed from a molten region, with relatively low defect densities remaining after cooling and recrystallisation. Crater diameter and penetration limits are compared to analytical scaling models: in agreement with some models we find the onset of penetration occurs for 1.0 < f/d p < 1.5, where f is the film thickness and d p is the projectile diameter. However, our results for the hole size agree well with scaling laws based on macroscopic experiments providing enhanced strength of a nano-film that melts completely at the impact region is taken into account. © 2010 Elsevier Ltd. All rights reserved. |
| spellingShingle | Higginbotham, A Bringa, E Taylor, E Graham, G Penetration scaling in atomistic simulations of hypervelocity impact |
| title | Penetration scaling in atomistic simulations of hypervelocity impact |
| title_full | Penetration scaling in atomistic simulations of hypervelocity impact |
| title_fullStr | Penetration scaling in atomistic simulations of hypervelocity impact |
| title_full_unstemmed | Penetration scaling in atomistic simulations of hypervelocity impact |
| title_short | Penetration scaling in atomistic simulations of hypervelocity impact |
| title_sort | penetration scaling in atomistic simulations of hypervelocity impact |
| work_keys_str_mv | AT higginbothama penetrationscalinginatomisticsimulationsofhypervelocityimpact AT bringae penetrationscalinginatomisticsimulationsofhypervelocityimpact AT taylore penetrationscalinginatomisticsimulationsofhypervelocityimpact AT grahamg penetrationscalinginatomisticsimulationsofhypervelocityimpact |