Mechanical testing of a test bar by cutting and filling with a repair metal prior to further cutting and fatigue testing, especially for characterizing repairs to the blades of monobloc turbine rotors

摘要

Method for mechanical characterization of metallic material in comparison with the metal of a part that is to be repaired and for validation of a repair installation in which the part to be repaired is refilled with the repairing metal, e.g. using a TIG welding process. The method has the following steps: machining of a cavity in a bar (50) of the said metal; refilling of the cavity by the installation; cutting a test piece from the bar such that it has a central region made up entirely of the filler material and; subjection of the test piece to vibration fatigue testing. The invention relates particularly to turbine blades made from the titanium alloy Ti17.