The Residual Stresses Generated by Deep Rolling and their Stability in Fatigue & Application to Deep-Rolled Crankshafts
|
| Journal |
Materials Science Forum (Volumes 524 - 525) |
| Volume |
Residual Stresses VII |
| Edited by |
W. Reimers and S. Quander |
| Pages |
45-50 |
| DOI |
10.4028/www.scientific.net/MSF.524-525.45 |
| Online since |
September, 2006 |
| Authors |
H. Michaud,
Jean Michel Sprauel,
F. Galzy
|
| Keywords |
Constitutive Law, Crankshafts, Deep Rolling, Fatigue Resistance, Residual Stress |
| Abstract |
In this work, the effect of steel grade on the fatigue resistance of deep-rolled
crankshafts is analysed. In the first part of this paper, the mechanisms leading to the increase
of the fatigue resistance brought by the deep rolling treatment, is presented. This reinforcement
is mainly linked to crack arrest due both to a decrease of the in-depth stress concentration
factor and to remaining compressive residual stresses induced by the deep rolling. In a second
part, an analytical model of residual stresses generation by deep-rolling and fatigue is
presented. In this model the low cyclic fatigue behaviour of the steel is taken into account, and
the residual stress stability with bending fatigue cycling can be predicted. After a presentation
of the experimental validation on two different microstructures (baintic and ferrito- perlitic),
this model is used for analysing the main parameters of the deep-rolling process and fatigue
resistance. |
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