Study on the influence of Salt spray environment on impact fatigue of Gun parts

Abstract In this study, live firing experiments were carried out on a certain type of automatic rifle in salt spray corrosion environment and non-corrosion daily environment. The purpose of this study is to explore the influence of salt spray environment on the impact fatigue of gun parts. In the salt fog environment, the fatigue life decreased significantly. Test the mechanical properties of the material, establish the finite element analysis model of the parts to analyze the stress distribution during impact, and observe the fracture morphology of the live ammunition experimental parts. The experimental results show that the impact toughness of the material decreases in salt fog environment, and the cumulative damage degree is greater after cyclic impact. Due to the coupling effect of plastic deformation accumulated in the corrosion medium and the stress concentration area, a large number of corrosion defects are more likely to occur. The existence of corrosion defects greatly promotes the crack initiation and propagation, forms a penetrating fatigue groove, and significantly reduces the corrosion fatigue life.