Abstract
A strong demand is arising for medium temperature (100°–250°C) resistant aluminium alloys, issued mainly from the aeronautical and from the automotive industries. As far as the aeronautical industry is concerned, it is mainly related to the future Supersonic Civil Transport (SCT) aircraft: in the European project, very stringent technical requirements have been announced since this aircraft is planned to reach a 80 000 hours service life [1]. Provided the cruise speed of the aircraft is close to Mach 2, aluminium alloys are valuable candidates as fuselage skin material but they have to exhibit both a high damage tolerance and a strong resistance to long term creep. In that respect design offices need a reliable creep prediction model based on accelerated tests in order to limit punitive real time testing. An improved understanding of creep deformation and damage mechanisms would allow gaining confidence in such a prediction.
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