Numerical Analysis of Behavior of the Nanostructured Bainitic Steel used in Armor

Abstract

Numerical model of 12.7 mm type B-32 projectile and high-strength samples of NANOSBA bainitic steel with hardness of 47 HRC were developed, tested and verified with experiment. Computer codes were adapted and modified using the free points method in version with so-called markers. It referred to a new method of maintaining of the calculation stability and proper selection of weighting factors for calculation of velocity gradients and stresses in the contact areas of materials with different properties. The basic criterion of the numerical model correctness was the shape and depth of penetration of the Armox 500T armor plate on which the bainitic steel samples were placed and fired with the 12.7 mm type B-32 projectile with velocity of 850 m/s. A satisfactory agreement was obtained of the theoretical results with firing tests of the samples, i.e. size and shape of craters in the Armox 500T plate.