Izvestiya of Saratov University.

Mathematics. Mechanics. Informatics

ISSN 1816-9791 (Print)
ISSN 2541-9005 (Online)

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Radchenko V. P., Berbasova T. I., Saushkin M. N., Akinfieva M. M. Relaxation of residual stresses in surface-hardened rotating prismatic elements of structures under creep conditions. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, 2023, vol. 23, iss. 4, pp. 512-530. DOI: 10.18500/1816-9791-2023-23-4-512-530, EDN: TAEGBQ

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Published online: 
30.11.2023
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Language: 
Russian
Heading: 
Mechanics
Article type: 
Article
UDC: 
539.376:621.787
DOI: 
10.18500/1816-9791-2023-23-4-512-530
EDN: 
TAEGBQ

Relaxation of residual stresses in surface-hardened rotating prismatic elements of structures under creep conditions

Autors: 
Radchenko Vladimir P., Samara State Technical University
Berbasova Tatiana I., Samara State Technical University
Saushkin Mikhail N., Samara State Technical University
Akinfieva Mariya M., Samara State Technical University
Abstract: 

A method for solving boundary problems of relaxation of residual stresses in a rotating surface-hardened prismatic specimen under high-temperature creep conditions has been developed. The problem models the stress-strain state of a surface-hardened prismatic rod with one end fixed to an infinitely rigid disk rotating at a constant angular velocity. In the first stage, we solve the problem of reconstructing fields of residual stresses and plastic deformations after the hardening procedure, which play the role of the initial stress-strain state, is solved. In the second stage, we address  the problem of relaxation of residual stresses under creep conditions is addressed. A detailed study of the influence of angular velocity on the intensity of residual stress relaxation in different sections along the axial coordinate is carried out for a $10{\times}10{\times}150$ mm prismatic specimen made of EP742 alloy at a temperature of 650$^\circ$C, following ultrasonic mechanical hardening of one of its faces. The analysis of the calculation results revealed that for angular velocities ranging from 1500 rpm to 2500 rpm, a non-trivial effect is observed. The relaxation of residual stresses in more stressed sections experiencing axial tensile stresses due to rotation occurs less intensively than in the “tail” section, where the axial load is zero. The obtained results from this study can be useful in assessing the effectiveness of surface-hardened rotating components under high-temperature creep conditions.

Key words: 
residual stresses
surface plastic deformation
rotating prismatic specimen
creep
relaxation
Acknowledgments: 
This work was supported by the Russian Science Foundation (project No. 23-29-00434), https://rscf.ru/en/project/23-29-00434/).
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Received: 
20.07.2023
Accepted: 
28.09.2023
Published: 
30.11.2023
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