Influence of scale on the penetration of tungsten rods into steel-backed alumina targets
1996 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, Vol. 18, no 4, 403-416 p.Article in journal (Refereed) Published
As ballistic tests are often performed in reduced geometrical scale, the scaling laws are important for the interpretation of the results. In this study, we tested the validity of replica scaling, by which we mean that all geometrical dimensions are scaled uniformly, while the materials and the impact velocity are kept the same. Long tungsten projectiles with length-to-diameter ratio 15 were fired against unconfined alumina targets with steel backing. The tests were carried out with impact velocities 1500 m s−1 and 2500 m s−1, and in three different scales with projectile lengths 30, 75 and 150 mm (diameters 2, 5 and 10 mm). The alumina targets were photographed by means of a high-speed camera, and the tungsten projectiles were photographed inside the alumina targets by means of flash radiography. Also, the residual penetrations in the steel backings were measured. The Johnson-Holmquist model for ceramic materials was implemented into the AUTODYN code, which was used for simulation of the experiments. The agreement between results of experiment and simulation was fair, and over the tested interval of scales replica scaling was found to be valid with reasonable accuracy.
Place, publisher, year, edition, pages
1996. Vol. 18, no 4, 403-416 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-92318DOI: 10.1016/0734-743X(95)00049-GOAI: oai:DiVA.org:uu-92318DiVA: diva2:165348