Influence of the Pre-Stressing on the Residual Stresses Induced by Deep Rolling

Influence of the Pre-Stressing on the Residual Stresses Induced by Deep Rolling

N. Lyubenova, M. Jacquemin, D. Bähre

Abstract. Deep rolling is a mechanical surface treatment, which main aim is to increase the fatigue life of components by reducing their roughness, increasing the surface hardening and inducing compressive residual stresses. The increase of certain process input parameters such as the applied pressure or the number of overturns leads directly to the raising of the induced compressive residual stresses. Nevertheless, a saturation point is always achieved, where the further increase of the parameters’ levels does not change the induced residual stresses. For other mechanical surface treatments, like shot peening, several pre-stress techniques were employed in order to further increase the induced residual stresses without raising the shot intensity or the coverage percentage. Pre-stressed shot peening with the means of bending or torsion is an established processing. Up to now, a few investigations are available regarding the pre-stressing techniques applied to deep rolling. Therefore, this paper offers a newly designed finite element model, built to calculate the induced residual stresses by bending, consequent deep rolling and springback. A four point bending setup with different pre-stress levels was employed and the influence of pre-stress levels on the induced residual stresses was investigated. Additionally, the applied deep rolling pressure was also varied in order to optimize this hybrid processing. At the end, the anisotropy of the induced longitudinal and transverse residual stresses due to the bending and deep rolling was analyzed.

Keywords
Residual Stresses, Mechanical Surface Treatment, Deep Rolling, Pre-stressing, Finite Element Simulation

Published online 12/22/2016, 6 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: N. Lyubenova, M. Jacquemin, D. Bähre, ‘Influence of the Pre-Stressing on the Residual Stresses Induced by Deep Rolling’, Materials Research Proceedings, Vol. 2, pp 253-258, 2017

DOI: http://dx.doi.org/10.21741/9781945291173-43

The article was published as article 43 of the book Residual Stresses 2016

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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