Vibrations in engineering and technology

Sivak Roman Ivanovich - Candidate Of Technical Sciences, Associate Professor, Vinnytsia National Agrarian University (3, Solnychna St., Vinnytsia, Ukraine, 21008, e-mail: sivak_r_i@ukr.net).

Rekechynsky Volodymyr Ivanovych - Postgraduate Student of Vinnytsia National Agrarian University (3, Solnyshchaya St., Vinnytsia, Ukraine, 21008, e-mail: volodimir_rekecinskiy@ukr.net).
 

In this paper we consider two-legged trajectories in the space of the deformation vector. Trajectories were obtained in tensile experiments with subsequent torsion and tensile experiments with subsequent joint tension and stretching of standard solid cylindrical samples from steel 10. Deformation was carried out according to programs that ensure the linearity of trajectories in the deformation space. The components of the stress deviator were determined using an anisotropically strengthened body model. In this experiment, a function characterizing the Bauschinger effect and a function characterizing the hereditary influence of the load history on the current state of the metal during plastic deformation was experimentally determined. It is shown that in the case of nonmonotonic loading, which is characterized by trajectories of large curvature, it is necessary to use O. A. Ilyushin's theory of plasticity, and the model G. Bachhaus yields satisfactory results only for trajectories of medium and low curvature. In general, the suitability of a particular plasticity theory needs to be verified experimentally.

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