This paper studied ballistic performance of aluminium blocks subjected to oblique impact oftungsten long-rod projectiles. Penetration experiments of tungsten alloy long rods impacting25.4mm thick blocks made of aluminium 7075-T651 were conducted at a nominal velocityof 1.25 km/s under NATO 60 degrees obliquity. A witness plate made of steel was placedbehind the target with an air gap of 300mm. Flash X-ray radiography was applied to captureimages of the projectiles before and after penetration. The test results showed the effect ofthe thick aluminium block to deflect the long rod projectile from its line of flight. Numericalsimulation of the experiment was carried out by using the hydrocode LS-DYNA to exploredefeat mechanisms of inclined aluminium blocks against tungsten long-rod projectiles. Theinclined aluminium block created the upwards mushrooming and bending of the projectile’snose during the whole process of penetration. The effect of trajectory deviation wasinsignificant during and immediate after the penetration; however, it became significantafter some time of the penetration, resulting in a noticeable increase of the pitch angle of theresidual projectile. Consequently, the residual projectile ricocheted from the surface of thewitness plate with limited penetration.
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