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

The paper presents the results of experimental verification of A.A. Ilyushin’s postulate of isotropy at complex elastoplastic deformation of thin-walled tubular specimens of steel 45, along the trajectories in the form of semicircles (rigid or kinematic loading). Experimental data have been obtained on the automated testing machine SN-EVM. The results of 4 experiments in which strain trajectories in the form of semicircles of constant curvature 133.3 were realized are presented and discussed. It is experimentally confirmed that for the realized complex trajectories of constant curvature the isotropy postulate is fulfilled both in scalar and vector properties.

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.