MEchanics GAthering -MEGA- Seminar: Quasi-static and dynamic crack front deformations in cohesive materials
Event details
| Date | 02.06.2022 |
| Hour | 16:15 › 17:30 |
| Speaker | Thibault Didier Roch (LSMS, EPFL) |
| Location | Online |
| Category | Conferences - Seminars |
| Event Language | English |
Abstract When a crack interacts with material heterogeneities, its front distorts and adopts complex tortuous configurations that are reminiscent of the energy barriers encountered during crack propagation. As such, the study of crack front deformations is key to rationalize the effective failure properties of micro-structured solids and interfaces, and help predict out of plane damage. Current models neglect the influence of a finite dissipation length-scale behind the crack tip, called the process zone size. We derive the equation ruling 3D dynamic coplanar crack propagation in heterogeneous cohesive materials where the opening of the crack is resisted by some traction in its wake, and support this theoretical framework with extensive fully dynamic numerical simulations. We show that the process zone introduces scale effects in the deformations of the crack front. They influence the front deformations as well as their stability when interacting with tough obstacles. In the case of fast cracks, these effects are mitigated by the dynamic of the crack itself due to the dynamic stiffening of the front and the Lorentz contraction of the process zone. Overall, our theory provides a unified framework to predict the variety of front profiles even when the small-scale yielding hypothesis of linear elastic fracture mechanics breaks down.
Bio Thibault is a PhD candidate at the Computational Solid Mechanics Laboratory. He received his Master in Civil Engineering from EPFL. His research focuses on dynamic rupture: he is interested in the behavior of frictional interfaces and in heterogeneous dynamic fracture, in particular the deformation of cracks fronts. His research is mainly conducted using numerical simulations, and he is involved in developing and releasing Open Source Software.
Bio Thibault is a PhD candidate at the Computational Solid Mechanics Laboratory. He received his Master in Civil Engineering from EPFL. His research focuses on dynamic rupture: he is interested in the behavior of frictional interfaces and in heterogeneous dynamic fracture, in particular the deformation of cracks fronts. His research is mainly conducted using numerical simulations, and he is involved in developing and releasing Open Source Software.
Practical information
- General public
- Free
Organizer
- MEGA.Seminar Organizing Committee