In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth

A. Messager (1) , A. Junet , T. Palin-Luc (2) , J.-Y. Buffiere (3) , N. Saintier (2) , N. Ranc (4) , M. El May , Y. Gaillard , A. King (5) , A. Bonnin (6) , Y. Nadot (7)

1 U3M - Unité de recherche Maladies Métaboliques et Micronutriments
2 I2M - Institut de Mécanique et d'Ingénierie
3 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
4 LMSP - Laboratoire de Mécanique des Systèmes et des Procédés
5 ESRF - European Synchrotron Radiation Facility
6 SwissFEL, Paul Scherrer Institut
7 ENDO - ENDOmmagement et durabilité [Institut Pprime]

This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is described as well as the method used for automatically detecting crack initiation and its subsequent growth. To promote internal crack initiation, specimens containing internal casting defects were tested between the high cycle and very high cycle fatigue regimes (107-109 cycles). Preliminary results show the ability of this new device to initiate an internal microstructurally short crack in a reasonable testing time and monitor its growth.

Mots clés: Ultrasonic fatigue testing; Very high cycle fatigue; Short fatigue cracks; Fatigue testing; Plastic deformation; Synchrotron radiation; Tomography; Ultrasonic testing; Casting defect; In-situ synchrotrons; Internal shorts; Crack propagation; Crack initiation; Aluminum alloys; Ability testing; X-ray tomography; Fatigue of materials

Domaines: Matériaux

A. Messager, A. Junet, T. Palin-Luc, J.-Y. Buffiere, N. Saintier, et al.. In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth. Fatigue and Fracture of Engineering Materials and Structures, 2020, 43 (3), pp.558-567. ⟨10.1111/ffe.13140⟩. ⟨hal-02405501⟩