Abstract
The test results of pre-deformed tubular samples at various values of preliminary deformation are presented. The article describes the chamber of the apparatus, which makes it possible to test tubular samples under conditions of plane and volumetric stress states. Curves built on test results of samples with different levels of preliminary plastic deformation are presented, as well as the test results of samples deformed by the ray α = 0.5. The experiments make it possible to determine the value of the ultimate uniform deformation after preliminary deformation or on the final segment of the multi-link loading path.
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