Snecma

Turbomeca

H.e.f.

Safran Aircraft Engines

Safran Helicopter Engines

Laurent Houze

Jean Vincent Manuel Meriaux

Philippe Maurin-Perrier

Eric Chaduiron

Guillaume Julien Puech

Nathalie Serres

François Vogel

Florent Ledrappier

Juan-Antonio Ruiz-Sabariego

Franck Vernis

Shamba Jumaine

Jean Philippe Lapuyade

Jean Vincent Meriaux

Guillaume Puech

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 low-cycle fatigue test rig reproduces bearing of turbine engine parts. The test rig includes a support member that is fixed to a frame and defines at least one bearing surface. A test piece is connected to a traction element for loading the test piece so that the test piece bears against the at least one bearing surface of the support member. The at least one bearing surface is supported by a support element that is mounted to rotate about a first axis on the support member. The test piece is connected to the traction element for articulation around a second axis that is perpendicular to the first axis. The test rig is configured to enable adjusting and locking the support element and the test piece in positions around the above-mentioned axes.

Oligocyclic fatigue or oligocyclic and polycyclic fatigue test rig

A pair of guiding elements is characterized in that at least one of its elements is made of a steel containing at least 0.15 to 0.3% by weight of carbon, 2 to 5% (preferably 2 to 3%) by weight of chromium, at least 0.45% (preferably no greater than 0.9%) by weight of molybdenum, and at least 0.01% by weight and no greater than 0.5% (preferably no greater than 0.3%) of vanadium. This steel is nitrided after being shaped whereby obtaining a compound layer consisting of iron and nitrogen atoms of a thickness ranging from 5 to 50 micrometers. The steel can also contain 0.4% to 1.5% by weight of manganese.

Pair of guiding elements of which one is made of specific steel leading to improved anti-seizing performances

A thin layer is deposited on a surface having a roughness profile whereof the parameters and mean period are determined for improving the tribological performance, so that the ratio A between the square of the mean period of the profile (P) in &#x3bc;m and the roughness profile (Pa) in &#x3bc;m, as defined by French standard ISO 4288, is equal to or greater than 5&#xd7;10&#x3bc;m.

Sliding mating part in lubricated regime, coated by a thin film

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Andoins, France

Laurent Houze