Radioscopy of Fatigue Cracks
Event details
| Date | 11.03.2014 |
| Hour | 13:15 › 14:15 |
| Speaker |
Prof. François Hild, Laboratory of Mechanics and Technology, Cachan (France) Bio : François Hild is Research Professor at the Laboratory of Mechanics and Technology in Cachan (France). He graduated from École Normale Supérieure de Cachan in 1989. He received his Ph.D. degrees in Mechanical Engineering from the University of Paris 6 in 1992 and from the University of California in 1995, and his habilitation from the University of Paris 6 in 1998. His research interests include advanced experimental techniques, digital image and volume correlation, identification and validation procedures for material models. |
| Location | |
| Category | Conferences - Seminars |
Abstract : 3D imaging techniques (e.g., X-ray computed microtomography or XRCMT) of in situ mechanical tests allow for the measurement of 3D displacement fields by resorting to digital volume correlation. More importantly, it enables for the identification of mechanical properties of opaque materials. When using XRCMT reconstructed volumes, measurement uncertainties and correlation residuals are assessed when finite element based volume correlation is used. In particular, artifacts related to the use of lab tomographs are discussed.
For a tensile test of cracked cast iron sample imaged by XRCMT, a fully coupled experimental / numerical procedure is based on an enriched kinematic basis as in eXtended finite element analyses. The crack surface, crack front, and stress intensity factor profiles are extracted from the measured displacements and compared with numerical predictions. It is also possible to evaluate local crack propagation features by analyzing different propagation steps. This type of analysis shows that there are direct ways to bridge the gap between experiments and simulations thanks to consistent kinematic bases and identification procedures, and opens the way for the validation of fracture laws and numerical models.
For a tensile test of cracked cast iron sample imaged by XRCMT, a fully coupled experimental / numerical procedure is based on an enriched kinematic basis as in eXtended finite element analyses. The crack surface, crack front, and stress intensity factor profiles are extracted from the measured displacements and compared with numerical predictions. It is also possible to evaluate local crack propagation features by analyzing different propagation steps. This type of analysis shows that there are direct ways to bridge the gap between experiments and simulations thanks to consistent kinematic bases and identification procedures, and opens the way for the validation of fracture laws and numerical models.
Practical information
- General public
- Free
Organizer
- IGM
Contact
- Géraldine Palaj