日本金属学会誌

J. Japan Inst. Metals, Vol. 2, No. 1 (1938),
pp. 3-8

On the Relation between the Shielding Efficiency and Physical Properties of Metals

Kôtarô Honda1, Seiichi Higuchi2

1東北帝大金屬材料研究所
2東北帝大工學部

Abstract:

The purpose of the present investigation was to obtain the relation between the absorbing energy of shiled plates in resisting the penetration by a rifle bullet and the physical properties of the material of the plate.
For the purpose mentioned above, we obtained at first experimentally the so-called “characteristic curves” of the shielding efficiency of the various metals under the conditions of three different initial velocities of the bullet, and secondly, based on the results of the above-mentioned experiments, the following relation was deduced
v2=v1-2/mv1(At2+Bt4),
where v1, v2, m and t denote the initial and residual velocity of the bullet, the mass of the bullet and the thickness of the shield plate respectively.
Next, using the above-mentioned experimental results, we arrived at the following results that A and B, the coefficients of the resistance, depend respectively on the hardness (H), the internal viscosity (μ) and also on the thermal diffusivity (K) of the metal of the shield plate, connected with each other by the following expression
where y=A or B, xH/K; a, b are the constants depending merely on the initial velocity of the bullet.


(Received 1937/09/30)

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