Numerical Simulation of the Impact of the Contact Angle between a 7.62 mm ARM2 Bullet and Steel Alloy Armored Plates of Armored Vehicle Cabins on the Degree of Bullet Penetration

This paper investigates the impact of the contact angle between the bullet and the plates made of three types of steel alloys of different thickness on the degree of bullet penetration. The finite element method (FEM) in the LS-DYNA software package is used for investigating the impact on the cabins of armored vehicles. The authors examine the process of penetrating steel plates of Armox560T, Hardox 400 and Weldox 700E alloys by a 7.62 mm ARM2 bullet (with a hard steel core) and only by the bullet core, with the bullet velocity of 830 m/s and various contact angles (30 – 90°) and plate thickness (3 – 8 mm). The main calculation results include the residual velocity and the residual kinetic energy of the bullet and the bullet core after the plate penetration, as well as predicting the mechanism of plate failure. Using the results obtained, it is possible to provide the degree of protection according to the European standard EN 1063 (the highest BR7 level) with the minimum plate thickness.

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