چكيده
Abstract
Considering to ability of Ceramic-Composite amours and using them
in different cases, they may be use as a shield in a variety of environments,
such as body armor, personnel carrier, helicopters, tanks and satellites. In
this research the armour with constant thickness has been studied that consist
of two layers, one is the Boron carbide ceramic and the other is Kevlar 49
fiber composite. By using the Ansys/Lsdyna software, ballistic limit velocity
of this armour has been obtained and Heterington’s equation that is about
optimum thickness of layers has been verified at constant thickness of
armour. Meanwhile it is noted the modified mechanical properties of Kevlar
49 that improved from strain rate, has been used in numerical simulation.
Results from the model have confirmed the validity of the Chocron-Galvez’s
analytical model and projectile velocity curve, especially at high velocity,
has good agreement in analytical and numerical simulations. Finally, impact
of projectile to armour has been compared in normal and oblique impacts
and results shown the ballistic limit velocity of armour increase in the
oblique impact.
