Fatigue crack growth from handling surface anomalies in a Nickel based superalloy at high temperature
1 Institut Pprime UPR CNRS 3346, Département Physique et Mécanique des Matériaux, ISAE-ENSMA, 86961 Futuroscope Chasseneuil, France
2 Snecma, Etablissement de Villaroche, 77550 Moissy Cramayel, France
a Corresponding author: firstname.lastname@example.org
Aircraft engine manufacturers have to demonstrate that handling surface anomalies in sensible areas of discs are not critical for in-service life of a component. Currently, the models used consider anomalies as long cracks propagating from the first cycle, which introduce a certain degree of conservatism when calculating the fatigue life of surface flaws. Preliminary studies have shown that the first stages of crack propagation from surface anomalies are responsible for the conservative results. Thus, the aim of the study is to characterize the crack propagation from typical surface anomalies and to establish a new crack growth model, which can account for the micro-propagation stage.
© Owned by the authors, published by EDP Sciences, 2014
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