English to Russian Tech/Engineering Military / Defense Ballistic testing

Shatter-gap is a phenomena exhibited by a few projectile / armour material interactions. The classical shatter-gap is exhibited when the projectile core is shattered and thereby defeated by the armour when impacted at relatively high velocities. At lower velocities, the projectile could however defeat the
armour because the impact energy is insufficient to break the projectile core. This usually results in projectile / armour combinations having multiple ballistic limit values as shown in ... The classical shatter gap phenomenon is most common with ceramic armour systems. Where a shatter gap is suspected, an appropriate
test procedure should be employed to explore the possibility of low velocity penetration.