Snecma

Turbomeca

Centre National De La Recherche Scientifique

Ecole Normale Superieure De Cachan

Safran Aircraft Engines

Safran Helicopter Engines

Ecole Normale Superieure Paris-saclay

François Vogel

Laurent Houze

Jean Vincent Manuel Meriaux

Jean Philippe Lapuyade

Franck Vernis

Caroline Mary

Christophe Cluzel

Raul Fernando De Moura Pinho

Arnaud Longuet

Sylvie Pommier

A test rig combining high-frequency tribological stress and low-cycle fatigue. The test rig includes a first test piece which is fixed to a frame and defines at least one bearing surface, a second test piece which is connected to an actuator for loading the second test piece so that it bears against the at least one bearing surface of the first test piece, a heater configured for heating the test pieces and a vibration generator, such as a shaker, for loading the test pieces in a vibratory manner so as to carry out a fretting fatigue and low-cycle and high-cycle fatigue test. One of the test pieces includes a portion in the shape of a turbine engine rotor blade root and which is inserted in a groove having a shape that is substantially complementary to the other test piece so as to reproduce a turbine engine blade-disc attachment.

Test bench combining high-frequency tribological stress and oligocyclic fatigue, on a blade disk of turboshaft engine of an aircraft including a test piece having a portion with a shape of a blade root of a rotor and is engaged in a groove shape complementary to another test piece

A method of determining the non-propagation threshold of fatigue cracks at high frequency, wherein cyclic loading is exerted on at least one testpiece having an elliptical hole in a testpiece zone, the elliptical hole having a notch at one end and the testpiece being held between two rigid masses with two rigid pre-stress plates being arranged on either side of the at least one testpiece and each fastened at its two ends to the two rigid masses, which cyclic loading is at a frequency that is selected as being equal to the resonant frequency of the assembly including the testpiece, the masses, and the stress plates, so as to generate a fatigue crack from the notch, and then once it has been observed that the crack has stopped propagating, the final length of the crack is measured and a chart is used to determine the non-propagation threshold.

Method of determining the non-propagation threshold of fatigue cracks at high frequency

Growing community of inventors

Ousse, France

François Vogel