Abstract
This paper investigates the performance of alumina/5083 aluminium, and alumina/Grade 43A steel armours when subjected to oblique impact by 7.62 mm Swedish FFV Armour Piercing, and U.K. Ball ammunition. It also describes the failure mechanism of composite targets and highlights the differences in Ball and AP attacks. It was found that the ballistic limit velocity ( V 50) increased with obliquity. In the majority of cases a weight penalty was incurred when such armour was inclined to attack. The results obtained were compared with predictions from both theoretical and empirical models and showed reasonable correlation. The theoretical model is based on an assumed failure mechanism which describes the observed deformation patterns. The empirical relationships are based on root cosine and root secant expressions [i.e. ( AD (ƒ) AD (n) = cos 0.5 ƒ) , and ( V 50(θ) V 50( n) = sec 0.5 ƒ) ] and provide an effective tool in armour design.
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