Fatigue size effect due to defects in an AA7050 alloy
Communication avec acte
One objective of this project is to propose a fatigue design approach that is able to account for a large range of machining surface defects and different component sizes and geometries. Due to the huge size difference between a typical fatigue specimen and large aircraft components it was first necessary to confirm if a size effect can indeed be observed. This was done by introducing different numbers of artificial surface defects on smooth specimens. The material investigated is a 7050 Aluminium alloy (Al Zn6CuMgZr). Plane bending specimens both without and with artificial hemispherical surface defects were tested. The number of defects was varied from 1 to 44 defects per specimen and the defect size ranged from 60 μm to 800 μm in diameter. The test results allow the characterization of both the defect effect and scale effect on the fatigue response of the material. A probabilistic approach based on the weakest link concept together with a proper fatigue crack initiation criterion is used to account for the stress distribution and the size of the highly stressed volume. Predictions using FE simulations show a good agreement with experimental results and illustrate the importance of taking the scale effect into account in HCF.
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Conférence invitéeABROUG, Foued; PESSARD, Etienne; GERMAIN, Guénaël; MOREL, Franck; CHOVE, Etienne (2016)Lors du fraisage UGV de pièces aéronautiques, certains défauts géométriques, tels que les ressauts et les marques de vibration, peuvent être générés. Pour obtenir une surface de bonne qualité, une opération de rectification ...
Conférence invitéeABROUG, Foued; PESSARD, Etienne; GERMAIN, Guénaël; MOREL, Franck; CHOVE, Etienne (2016)During the High Speed Machining (HSM) of aircraft components, geometrical defects, such as mismatches or chatters, can be created. To obtain a high surface quality, an expensive manual grinding operation is systematically ...
Communication avec acteABROUG, Foued; PESSARD, Etienne; GERMAIN, Guénaël; MOREL, Franck; CHOVE, Etienne (Elsevier BV - Procedia Engineering, 2018)The aim of this study is to identify the impact of High Speed Machining defects on the fatigue behaviour of the Al7050 aluminium alloy. A vast experimental campaign under fully reversed plane bending loads containing ...
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A probabilistic approach to study the effect of machined surface states on HCF behavior of a AA7050 alloy Article dans une revue avec comité de lectureABROUG, Foued; PESSARD, Etienne; GERMAIN, Guénaël; MOREL, Franck (Elsevier, 2018)The aim of this study is to understand the impact of periodic surface micro-geometry patterns (obtained by High Speed Machining process) on the fatigue behavior of the AA7050 aluminium alloy and to define a proper defect ...