Fabrication of artificial defects to study internal fatigue crack propagation in metals

Article dans une revue avec comité de lecture
Auteur
JUNET, Arnaud
31551 Matériaux, ingénierie et science [Villeurbanne] [MATEIS]
MESSAGER, Alexandre
1002421 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
BOULNAT, Xavier
31551 Matériaux, ingénierie et science [Villeurbanne] [MATEIS]
WECK, Arnaud
237693 University of Ottawa [Ottawa]
BOLLER, Elodie
2568 European Synchrotron Radiation Facility [ESRF]
186406 High-resolution Diffraction Topography Beamline [ID19]
HELFEN, Lukas
2568 European Synchrotron Radiation Facility [ESRF]
150665 Karlsruhe Institute of Technology = Karlsruher Institut für Technologie [KIT]
ccBUFFIERE, Jean-Yves
31551 Matériaux, ingénierie et science [Villeurbanne] [MATEIS]
219748 Institut National des Sciences Appliquées de Lyon [INSA Lyon]

URI
http://hdl.handle.net/10985/19140
DOI
10.1016/j.scriptamat.2019.05.018
Date
2019
Journal
Scripta Materialia

Résumé

Fatigue specimens designed with controlled internal defects were obtained by diffusion bonding of Ti-6Al-4V sheets containing femtosecond laser drilled notches. Crack initiation from the internal defect occurred systematically. The cracks were characterised by in situ synchrotron X-ray tomography. Propagation rates are lower than those of surface cracks of comparable sizes in the same material and fall between experimental data obtained for fatigue cracks propagating in air and in vacuum.

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