uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Deformation and fracture of a long-rod projectile induced by an oblique moving plate: Experimental test
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2011 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, Vol. 38, no 12, 989-1000 p.Article in journal (Refereed) Published
Abstract [en]

The influence of projectile length to diameter ratio (15, 30 and 45), plate thickness (0.5, 1 and 2 projectile diameters), projectile velocity (1500, 2000 and 2500 m/s) and plate velocity (−300 to 300 m/s) on the interaction between long-rod tungsten projectiles and oblique steel plates (obliquity 60°) was studied experimentally in small-scale reverse impact tests. The residual projectiles and their motions were characterised in terms of changes in length, velocity, angular momentum, linear momentum and kinetic energy. The parameters found to have the largest influence on the disturbance of the projectile were the plate velocity, in particular its direction, and the thickness of the plate. In the ranges studied, the influence of length to diameter ratio and of projectile velocity were found to be less important.

Place, publisher, year, edition, pages
2011. Vol. 38, no 12, 989-1000 p.
Keyword [en]
Reactive armour, Oblique plate, Long-rod projectile, Small scale, Reverse impact
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-132938DOI: 10.1016/j.ijimpeng.2011.07.002ISI: 000296680700007OAI: oai:DiVA.org:uu-132938DiVA: diva2:359761
Available from: 2010-10-29 Created: 2010-10-29 Last updated: 2015-08-12Bibliographically 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.
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
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)
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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Lundberg, Bengt
By organisation
Applied Mechanics
In the same journal
International Journal of Impact Engineering
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 471 hits
ReferencesLink to record
Permanent link

Direct link