plasticity, complex loading, experimental data, strain trajectory, vector and scalar material properties.

The paper presents experimental results of deformation of a thin-walled tubular specimen along a smooth curvilinear strain trajectory of constant curvature, in which the sign of curvature changes at each section and its center shifts. Experimental data were obtained on the automated calculation-experimental complex SN-Computer in the deviator space of deformations A.A. Ilyushin (rigid loading) with a simultaneous combined action on the specimen of tensioncompression and torsion. Scalar and vector material properties of steel 45 are investigated. It is shown that experimental diagrams characterizing scalar and vector properties of the material have oscillatory character.

Gulyiaev, Vadim Ivanovich, Doctor of technical sciences, Head of Department of Automobile roads, bases and foundations, Tver State Technical University, Tver, Russia.

Zubchaninov, Vladimir Georgievich, Doctor of technical sciences, Professor, Department of Strength of materials, theory of elasticity and plasticity, Tver State Technical University, Tver, Russia, Alekseev, Andrey Alekseevich, Ph.D. (Technical Sciences), Associate Professor, Department of Strength of Materials, Theory of Elasticity and Plasticity, Tver State Technical University, Tver, Russia,

Savrasov, Ivan Alexandrovich, Postgraduate Student of the Department of Strength of Materials, Theory of Elasticity and Plasticity, Tver State Technical University, Tver, Russia.