Fabrication of artificial defects to study internal fatigue crack propagation in metals
Fabrication of artificial defects to study internal fatigue crack propagation in metals
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. © 2019 Acta Materialia Inc.
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.
Mots clés
Titanium alloys
Ternary alloys
Synchrotrons
Synchrotron radiation
Artificial defects
Fatigue cracks
Tomography
Vanadium alloys
Aluminum alloys
Fatigue crack propagation
Fatigue of materials
Spark plasma sintering
In-situ synchrotrons
Internal defects
Propagation rate
Fatigue specimen
Three-dimensional tomography
Surface cracks
Origine | Fichiers produits par l'(les) auteur(s) |
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