The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2016
Filed:
Aug. 30, 2013
Snecma, Paris, FR;
Turbomeca, Bordes, FR;
Centre National DE LA Recherche Scientifique, Paris, FR;
Ecole Normale Superieure DE Cachan, Cachan, FR;
Caroline Mary, Paris, FR;
Christophe Cluzel, Ballainvilliers, FR;
Raul Fernando De Moura Pinho, Paris, FR;
Arnaud Longuet, Longjumeau, FR;
Sylvie Pommier, Antony, FR;
Francois Vogel, Ousse, FR;
SNECMA, Paris, FR;
TURBOMECA, Bordes, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
ECOLE NORMALE SUPERIEURE DE CACHAN, Cachan, FR;
Abstract
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.