Investigation of Vector and Scalar Properties Steel 12X18H10T on Spatial Curvilinear Stress Trajectories

The paper presents the results of an experimental study of scalar and vector properties of steel on spatial curvilinear stress trajectories under complex loading. Experimental studies were carried out on a CL-computer (complex loading) test machine on thin-walled tubular specimens made of steel 12X18H10T. The material of the specimens was initially isotropic, which was established in experiments under proportional loading. The trajectories differ in the location of the center of the stress trajectory projection in the coordinate plane S1–S3 of deviatoric stress space and the conditions for the beginning of the implementation of a complex loading process. The obtained strain trajectories and stress-strain diagrams are presented and their properties are analyzed. The scalar and vector properties of the specimen material (steel 12X18H10T) are studied, which are the main characteristics in experimental and theoretical studies of the processes of elastic-plastic deformation of materials under complex loading. The results of the experimental studies carried out can be used to verify the mathematical models of the theory of plasticity and to establish the limits of their applicability when comparing the calculated data with the experimental data on the realized three-dimensional stress trajectories.