On the Inertia Term of Projectile's Penetration Resistance

Table 1

Material constants for the HJC model of 23 MPa concrete.

𝜌𝑡 (kg·m^−3)	𝐸 (GPa)	𝐺 (GPa)	𝑓𝑐 (MPa)
1970	13.8	7.5	23
𝜐	A	B	C	N
0.2	0.79	1.6	0.007	0.61