Dynamic Mechanical Properties of High Nitrogen Steel under Combined Loading

Abstract

High speed collision is the main feature of armored service environment. It is very important for armor structure design to study the dynamic response of armor material under high strain rate loading. Based on Hopkinson bar techniques, dynamic performance experiments of high-nitrogen steel under combined loading were carried out in this paper. The stress-strain curves of high nitrogen steel under different loading conditions were obtained. The results show that with the increase of shear stress ratio, the anti-failure ability of high nitrogen steel decreases significantly. When the loading angle was 90° and 60°, the fracture surfaces and stress-strain curves of the samples were significantly different under the same loading conditions. With the decrease of the loading angle, the fracture surface and the stress-strain curve of the sample under the same loading condition tend to be the same. In the process of combined loading, with the reduction of the loading angle, the tensile force of the sample at the yield stage decreases gradually.