Resistance to the Penetration of a Bullet through an Aluminium Plate.

概要

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Neglecting the small values of the frictional force, the resistance dRv to the elementary surface area do of a bullet was theoretically deduced as [numerical formula] where v is the velocity of the bullet, p the specific weight of the aluminium, g the acceleration of the gravity and γ the angle between the surface do and the direction of its motion. Finally. P_0 is the statical contact pressure acting on the surface do 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 ε= 3.2, 4.9, 8.2, 1.21mm respectively. (Here considered only the case of the normal attack.). These calculated values were found to be consistent with the experimental results which were obtained with respect to the same bullets shot at the same aluminium plates by a rifle.
社団法人日本物理学会の論文
1951-10-25