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2. Life of a Ti–6Al–4V alloy under fretting fatigue: Study of new nonlocal parameters

Author

Ferry, Barbara, Araújo, José Alexander, Pommier, Sylvie, Demmou, Karim, Castro, F. C., Bellecave, J., Meriaux, J., Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), SNECMA Villaroche [Moissy-Cramayel], Safran Group, and Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Stress gradient, Materials science, Critical distance, business.industry, Mechanical Engineering, Boundary (topology), Fretting, 02 engineering and technology, Surfaces and Interfaces, Structural engineering, Mechanics, Edge (geometry), 021001 nanoscience & nanotechnology, Surfaces, Coatings and Films, [SPI]Engineering Sciences [physics], 020303 mechanical engineering & transports, 0203 mechanical engineering, Mechanics of Materials, Vector field, 0210 nano-technology, business, Intensity (heat transfer), Reliability (statistics), ComputingMilieux_MISCELLANEOUS
Abstract

This paper proposes the experimental validation of a nonlocal method which describes the stress gradient effect in fretting fatigue. Through the extraction of an approximate velocity field at the proximity of the contact edge, it has been possible to extract nonlocal intensity factors that take into account the gradient effect, whatever the geometry considered. A multiaxial fatigue criterion, the Multiaxial Wolher Curve Method in conjunction with the Theory of Critical Distance, was applied in terms of nonlocal intensity factors not only to predict the boundary between the safe zone and the damage zone, but also to estimate the number of cycles to failure. To validate the reliability of this nonlocal description, a set of fretting experiments was conducted for a Ti–6Al–4V alloy. These experimental tests were carried out by varying the stress gradient at the vicinity of the contact.

Published
2017
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