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Transition between interface defeat and penetration for tungsten projectiles and four silicon carbide materials
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
2005 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, Vol. 31, no 7, 781-792 p.Article in journal (Refereed) Published
Abstract [en]

Armour systems containing high-quality ceramics may be capable of defeating armour-piercing projectiles on the surfaces of these hard materials. This capability, named interface defeat, has been studied for four different silicon carbide ceramic materials, viz., SiC–B, SiC–N, SiC–SC–1RN and SiC–HPN by use of a light-gas gun and a small-scale reverse impact technique. The velocities of a tungsten projectile marking the transition between interface defeat and penetration have been determined and compared with the Vickers hardness and fracture toughness of the ceramic materials. It is found that the transition velocity increases with the fracture toughness but not with the Vickers hardness. This indicates that, under the prevailing conditions, fracture may have had more influence than plastic flow on the transition. As a consequence, the observed transition velocities may not be the maximum ones achievable, at least not for SiC–B, SiC–N and SiC–SC–1RN. By suppression of the initiation and propagation of cracks through increase of the confining pressure, it may be possible to increase the transition velocities.

Place, publisher, year, edition, pages
2005. Vol. 31, no 7, 781-792 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-92321DOI: 10.1016/j.ijimpeng.2004.06.003OAI: oai:DiVA.org:uu-92321DiVA: diva2:165351
Available from: 2004-11-03 Created: 2004-11-03 Last updated: 2013-09-18Bibliographically approved
In thesis
1. Interface Defeat and Penetration: Two Modes of Interaction between Metallic Projectiles and Ceramic Targets
Open this publication in new window or tab >>Interface Defeat and Penetration: Two Modes of Interaction between Metallic Projectiles and Ceramic Targets
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ceramics constitute an important group of low-density armour materials. Their high intrinsic strength makes it possible to design ceramic armour systems capable of defeating projectiles directly on the ceramic surface. This capability, named interface defeat, signifies that the projectile material is forced to flow radially outwards on the surface of the ceramic without penetrating significantly.

This thesis presents impact experiments between long-rod projectiles and ceramic targets. The projectile/target interaction was studied using flash X-ray technique. Transition velocities (the impact velocity at which interface defeat can no longer be maintained and penetration starts) were estimated for different combinations of metallic projectiles and ceramic targets and compared to critical velocities estimated on a theoretical basis. Replica scaling experiments were also performed in order to investigate the possible influence of scale.

All ceramic materials tested showed a distinct transition from interface defeat to penetration. Experiments with different silicon carbides showed that the transition velocity correlated better with the fracture toughness than with the hardness of the ceramic materials. For conical projectiles, penetration occurred along a conical surface crack and at a lower transition velocity than that observed for cylindrical projectiles. Experiments with unconfined alumina targets in different scales showed only a slight increase in dimensionless final penetration with length scale.

A unique transition velocity seems to exist for each combination of projectile, target material and target configuration. This velocity was found to depend on both the strength (hardness) and the brittleness (fracture toughness) of the ceramic. The lower transition velocity of conical projectiles compared with cylindrical ones is mainly due to the radially expanding load and the penetration of projectile material into surface cracks. The results of the experiments in different scales indicate that replica scaling is valid for penetration in ceramics.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 53 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1033
Keyword
Engineering physics, projectile, target, impact, interface defeat, penetration, tungsten, ceramic, replica scaling, Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:uu:diva-4641 (URN)91-554-6077-1 (ISBN)
Public defence
2004-12-03, Room 80121, The Ångström Laboratory, Lägerhyddsvägen 1, Polacksbacken, Uppsala, 10:00
Opponent
Supervisors
Available from: 2004-11-03 Created: 2004-11-03Bibliographically approved

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Lundberg, Bengt

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