Modelling of Ballistic Impact over a Ceramic-Metal Protection System

Table 5

Values of the constants used in the modified model.

Symbol	Property	Value
𝜌𝑐	Ceramic density (g/cm³)	Composition B; 3.9	Composition C; 3.8
𝐸𝑐	Ceramic elastic modulus (GPa)	300
𝑒𝑐	Ceramic thickness (mm)	11.3   9.3     7.3
𝑅𝑐	Resistance against penetration on ceramic (GPa)	Composition B; 4.43	Composition C; 3.60
𝜌𝑚	Metal density (g/cm³)	7.77
𝐸𝑚	Metal elastic modulus (GPa)	193
𝑒𝑚 and ℎ	Metal thickness (mm)	15
𝐴	Metal strength (MPa)	935
𝑛	Metal hardening exponent	0.29
k mod	Metal modified deflection profile constant (m^−1)	0.0018
𝑌	Projectile dynamic yielding (GPa)	2.82
𝜌𝑝	Projectile density (g/cm³)	8.41