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Influence of side impacting dynamic armour components on long rod projectiles
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2007 (English)In: / [ed] Francisco Gálvez, Vicente Sánchez-Gálvez, 2007Conference paper, Published paper (Refereed)
Abstract [en]

(LRP) before they hit the basic armour is a weight efficient way of in-creasing the protection of lighter vehicles. In this study, the effect of moving armour components, in the form of one or three cylindrical rods, hitting the side of the LRP, was investigated. The rods were hit-ting the side of the LRP at an angle of attack of 60 degrees. Rod ve-locities of 200 and 600 m/s and hitting points in the front and in the middle of the LRP were studied. The velocity of the LRP was 2000 m/s. The study is based on small scale reverse impact experiments and continuum dynamic simulations.To break the LRP, high rod velocities must be used. One rod hitting the LRP at 200 m/s gives approximately the same effect (some yaw but no fracture) as that of a moving oblique plate having the same ve-locity and angle of obliquity. Increasing the velocity of the rod to 600 m/s resulted in fracture of the LRP closely behind the hitting point both when hitting the front and the middle of the LRP. When using three rods, fracture was only obtained when the hitting points of the rods were closely spaced.

Place, publisher, year, edition, pages
2007.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-132939OAI: oai:DiVA.org:uu-132939DiVA: diva2:359765
Conference
International Symposium on Ballistics,23rd International Symposium on Ballistics, Tarragona, Spain, 16-20 April 2007
Available from: 2010-10-29 Created: 2010-10-29 Last updated: 2016-04-07Bibliographically approved
In thesis
1. Interaction between High-velocity Penetrators and Moving Armour Components
Open this publication in new window or tab >>Interaction between High-velocity Penetrators and Moving Armour Components
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work was aimed at understanding mechanisms of importance for the design of weight-efficient armour against long-rod projectiles (LRP) and shaped charge (SC) warheads. The focus was on how to achieve effective mechanical disturbances on the threat before it hits the target.

Methods were developed for laboratory tests in full and reduced scale, and for registration and evaluation of the fast and violent events involved. For numerical simulations, the Xue-Wierzbicki fracture model was implemented and used for the LRP in order to allow fractures due to shear load without extensive damage of the entire projectile. In order to reproduce the scattering of the SC jet after interaction with reactive armour, use was made of a very fine computational mesh.

Severe disturbances and fractures of the penetrators (LRP and SC jet) originate from the interaction phase in which a plate slides along the penetrator. In the case of an SC jet, this sliding contact results in severe scattering of the SC jet due to instabilities of the same kind as those between two fluids in contact, moving in parallel with different tangential velocities (Kelvin-Helmholtz instabilities). The generation of such instabilities is caused by the very high velocity (in the order of 10000 m/s) and the relatively low material strength of the SC jet in combination with the high contact pressure and the motion of the plate. In the case of an LRP, the high strength of the material of the projectile and its low velocity (in the order of 2000 m/s) relative to that of an SC jet, prevent the generation of KH-instabilities. Instead, fractures of the projectile may occur due to abrupt change of contact pressure at the exit of the plate. The positive pressure gradient and longer interaction time of forwards moving plates compared to backwards moving plates make the former plates more effective. A side-hitting steel rod gives approximately the same effect on an LRP as that of a steel plate with the same thickness, velocity and angle of obliquity.

The results obtained can be used for assessment and optimisation of reactive armour modules and active protection systems.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 65 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 784
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid Mechanics
Identifiers
urn:nbn:se:uu:diva-132922 (URN)978-91-554-7940-4 (ISBN)
Public defence
2010-12-15, Häggsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Note
Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 714Available from: 2010-11-24 Created: 2010-10-29 Last updated: 2011-03-21Bibliographically approved

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