In this paper, the 7.62 mm x 51 mm FFV round consisting of a tungsten carbide
core (1550 HV) and copper gilding jacket was fired at silicon nitride, titanium
diboride, tungsten carbide and silicon carbide ceramics. Of particular interest
is the thickness of the ceramic required to change the penetration mechanism
from that of an intact body to broken body, and finally, to becoming completely
fragmented during penetration. There appears to be a correlation between the
acoustic impedance of the ceramic and the thickness required to shatter the
core. The effect of ceramic hardness is less-marked. The existence of a critical
thickness to shatter the core suggests that it is not only the magnitude of the
shock-stress imparted to the core but the duration of the shock-stress that is
important in causing shattering of these relatively brittle cores
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