The effect of the Bauschinger effect and material hardening on the occurrence of secondary plastic deformations during autofreting of a thick-walled cylinder


Аuthors

Feoktistov S. I.*, Andrianov I. K.**, Htet L. ***

Komsomolsk-on-Amur State University (KnASU), 27, Lenin str., Komsomolsk-on-Amur, 681013, Russia

*e-mail: serg_feo@mail.ru
**e-mail: ivan_andrianov_90@mail.ru
***e-mail: linhtetnaining513028@gmail.ru

Abstract

The scientific research is devoted to the problem of calculating thick-walled axisymmetric cylindrical shells under conditions of hydraulic autofreting by internal pressure. The known analytical solutions to the problems of pipe autofreting in most cases do not take into account the conditions for the occurrence of secondary plastic strains during unloading. The purpose of this study was to evaluate the effect of the Bauschinger effect and material hardening, as well as the geometric parameters of the cylinder and the magnitude of the plasticity region in the wall of the cylindrical shell on the conditions of secondary plastic strains during unloading. The paper considers a model of the behavior of the material under alternating loading, taking into account the hypotheses and assumptions made in solving the problem. An equation is obtained that allows us to determine the conditions for the occurrence of secondary plastic strains depending on the listed factors. Within the framework of numerical calculations, it is concluded that the size of the plastic region in the cylinder wall has a significant effect on the occurrence of secondary plastic strains during autofreting. The results of numerical calculations for an ideal elastoplastic material are presented. According to the results of the study, with an increase in the hardening modulus and a decrease in the Bauschinger effect coefficient, the ratio of the outer radius of the cylinder to the inner one, at which secondary plastic deformations may occur during unloading during autofreting, can significantly decrease, and with a decrease in the overvoltage coefficient – increase.

Keywords:

secondary plastic strains, thick-walled cylinder, autofrettage, linear hardening, Bauschinger effect

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