Surface Plastic Deformation Mechanics. The Residual Stresses in the Hardened Elastic-Plastic Body
- Authors: Mahalov M.S.1, Blumenstein V.Y.1
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Affiliations:
- Issue: Vol 21, No 2 (2019)
- Pages: 110-123
- Section: MATERIAL SCIENCE
- URL: https://bakhtiniada.ru/1994-6309/article/view/302032
- DOI: https://doi.org/10.17212/1994-6309-2019-21.2-110-123
- ID: 302032
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Abstract
Introduction. Macroscopic residual stresses (RS) are one of the key metal mechanical state parameters, which largely determines products and structures operational life. Surface plastic deformation (SPD) hardening treatment creates in the surface layer (SL) favorable compressive RS and significantly increases the fatigue life both before and after the fatigue cracks appearance. In this area of knowledge, the problem of high complexity and laboriousness of the experimental determination of RS, as well as the problem of calculating residual stresses under complex non-monotonic types of loading, which include most of the methods of mechanical processing, remains relevant. The research purpose is to develop the theory of formation and increase the reliability of calculations of residual stresses in the processing of SPD based on the model of a strengthened elastic-plastic body. Results and discussion. The paper presents the SPD process simulation results and RS tensor components calculations. The model is made using the finite element method based on the conceptual framework of the mechanics of technological inheritance (TI), taking into account the effect of the strengthened body. It is established that the highest compressive residual stresses values are typical for the axial component, and the extremum can be located both on the workpiece surface and at some distance from it. The depth of compressive residual stresses distribution is about 3 mm with a depth of distribution of significant in magnitude stresses of about 7 mm. The hardened body influence on the residual stresses distribution is performed. The obtained result corresponds to the idea that the hardened metal, which have an increased yield stress limit, allows the larger RS values presence. The tendencies of changes in the distribution of the components of the RS tensor over the depth of the SL, depending on the main parameters of the SPD processing mode: tension and profile radius of the roller, are revealed.
About the authors
M. S. Mahalov
Email: maxim_ste@mail.ru
Ph.D. (Engineering), Associate Professor, Kuzbass State Technical University named after T.F. Gorbatchev, 28 Vesennaya st., Kemerovo, 650000, Russian Federation, maxim_ste@mail.ru
V. Yu. Blumenstein
Email: blumenstein@rambler.ru
D.Sc. (Engineering), Professor, Kuzbass State Technical University named after T.F. Gorbatchev, 28 Vesennaya st., Kemerovo, 650000, Russian Federation, blumenstein@rambler.ru
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