Verification of a Mathematical Model of 12Kh18N9 Steel Deformation Under Dynamic Loading of Fuel Assemblies

A model of the deformation of 12Kh18N9 steel used in fuel assemblies is verified based on the results of experimental investigations. The characteristics of the investigated steel under dynamic loading are determined by the Kolsky method using Nicholas scheme. The values of the ultimate strength and their dependence on the strain rate and temperature are found based on the actual strain diagrams obtained under different loading conditions. The parameters of the Johnson–Cook model were determined from the experimental results on deformation of 12Kh18N9 steel under static and dynamic loading. The verification process showed that the selected mathematical model gives a very accurate description of the behavior of the material under dynamic loading conditions.