On the continued acceleration of bomb casing fragments following casing fracture
It has been said that, once a bomb casing has fractured, “detonation gases will then stream around the fragments or bypass them, and the acceleration process stops there.” However, while apparently copious gas flow through casing fractures indicates some pressure release, it is also an indication of...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2014-06-01
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| Series: | Defence Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214914714000452 |
| _version_ | 1818938576582213632 |
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| author | Michael D. Hutchinson David W. Price |
| author_facet | Michael D. Hutchinson David W. Price |
| author_sort | Michael D. Hutchinson |
| collection | DOAJ |
| description | It has been said that, once a bomb casing has fractured, “detonation gases will then stream around the fragments or bypass them, and the acceleration process stops there.” However, while apparently copious gas flow through casing fractures indicates some pressure release, it is also an indication of significant gas drive pressure, post casing fracture. This paper shows two approaches to the problem of calculating the actual loss of drive. One presents first-order analytical calculations, in cylindrical geometry, of pressure loss to the inside surface of a fractured casing. The second shows the modelling of a selected example in the CTH code. Both approaches reveal that gas escape, while occurring at its own sound-speed relative to the adjacent casing fragments, has to compete with rapid radial expansion of the casing. Together with some historic experiments now publicly available, our calculations indicate that post-fracture casing fragment acceleration is, for most systems, unlikely to be reduced significantly. |
| first_indexed | 2024-12-20T06:10:03Z |
| format | Article |
| id | doaj.art-a51cbdd7c89d49b7adb4449fdbda5190 |
| institution | Directory Open Access Journal |
| issn | 2214-9147 |
| language | English |
| last_indexed | 2024-12-20T06:10:03Z |
| publishDate | 2014-06-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Defence Technology |
| spelling | doaj.art-a51cbdd7c89d49b7adb4449fdbda51902022-12-21T19:50:43ZengKeAi Communications Co., Ltd.Defence Technology2214-91472014-06-0110221121810.1016/j.dt.2014.06.001On the continued acceleration of bomb casing fragments following casing fractureMichael D. Hutchinson0David W. Price1AWE, Aldermaston, Reading RG7 4PR, UKAWE, Aldermaston, Reading RG7 4PR, UKIt has been said that, once a bomb casing has fractured, “detonation gases will then stream around the fragments or bypass them, and the acceleration process stops there.” However, while apparently copious gas flow through casing fractures indicates some pressure release, it is also an indication of significant gas drive pressure, post casing fracture. This paper shows two approaches to the problem of calculating the actual loss of drive. One presents first-order analytical calculations, in cylindrical geometry, of pressure loss to the inside surface of a fractured casing. The second shows the modelling of a selected example in the CTH code. Both approaches reveal that gas escape, while occurring at its own sound-speed relative to the adjacent casing fragments, has to compete with rapid radial expansion of the casing. Together with some historic experiments now publicly available, our calculations indicate that post-fracture casing fragment acceleration is, for most systems, unlikely to be reduced significantly.http://www.sciencedirect.com/science/article/pii/S2214914714000452Bomb casingFractureGas escapeAnalytical and numerical calculationFragment acceleration |
| spellingShingle | Michael D. Hutchinson David W. Price On the continued acceleration of bomb casing fragments following casing fracture Defence Technology Bomb casing Fracture Gas escape Analytical and numerical calculation Fragment acceleration |
| title | On the continued acceleration of bomb casing fragments following casing fracture |
| title_full | On the continued acceleration of bomb casing fragments following casing fracture |
| title_fullStr | On the continued acceleration of bomb casing fragments following casing fracture |
| title_full_unstemmed | On the continued acceleration of bomb casing fragments following casing fracture |
| title_short | On the continued acceleration of bomb casing fragments following casing fracture |
| title_sort | on the continued acceleration of bomb casing fragments following casing fracture |
| topic | Bomb casing Fracture Gas escape Analytical and numerical calculation Fragment acceleration |
| url | http://www.sciencedirect.com/science/article/pii/S2214914714000452 |
| work_keys_str_mv | AT michaeldhutchinson onthecontinuedaccelerationofbombcasingfragmentsfollowingcasingfracture AT davidwprice onthecontinuedaccelerationofbombcasingfragmentsfollowingcasingfracture |