Resistance to the Penetration of a Bullet through an Aluminium Plate

Neglecting the small values of the frictional force, the resistance d R v to the elementary surface area d σ of a bullet was theoretically deduced as \begin{aligned} dRv{=}\left(P_{0}+\frac{\rho}{g}v^{2}\sin^{2}\gamma\right)\sin\gamma\cdot d\sigma \end{aligned} where v is the velocity of the bullet, ρ the specific weight of the aluminium, g the acceleration of the gravity and γ the angle between the surface d σ and the direction of its motion. Finally. P 0 is the statical contact pressure acting on the surface d σ and, from the results of the statical penetration test carried out with the cylindrical mandrel, the author gave it the constant value for each thickness e of the aluminium plates. Assuming that P 0 is independent of the angle γ, the velocity drops suffered by the conical bullets from passing through the aluminium plates were calculated from the above equation for three values 2γ=180°, 90°, 60° of the conical angle and four values e =3.2, 4.9, 8.2, 1.21mm respectively. (Here considered only the ...