Friction is fracture: frustrated cracks and slippery surfaces
Event details
| Date | 02.02.2016 |
| Hour | 10:00 › 11:00 |
| Speaker |
Dr. Elsa Bayart, The Hebrew University of Jerusalem, Israel Bio : Since October 2013 I am a postdoctoral fellow in the group of Prof. Jay Fineberg at the Hebrew University of Jerusalem in Israel. My current research focuses on solid friction. I achieved my PhD at Laboratoire de Physique Statistique in Ecole Normale Supérieure in Paris under the supervision of Prof. Mokhtar Adda-Bedia and Prof. Arezki Boudaoud, working about the emergence of disorder by the confinement of an elastic rod. Prior to that, I earned a Master's degree in Physics of fluid and soft matter in Université Paris 6. After my PhD and before pursuing my academic career in Israel, I had an experience in environmental engineering, about sediment transport in rivers. My research focuses on experimental solids mechanics, including thin solids under large deformation, mechanics of granular material, fracture mechanics and solid friction. |
| Location | |
| Category | Conferences - Seminars |
Abstract :
The transition from static to sliding friction is mediated by interfacial shear cracks. These cracks break the solid contacts that form rough frictional interfaces and are quantitatively described in term of fracture mechanics. First, we will focus on arrested frictional ruptures that serve as precursors to sliding motion. We will show that fracture mechanics describe the spontaneous arrest of these precursory ruptures. This result shed light on the actively debated question in seismology of the selection of an earthquake’s magnitude and arrest. Then, we will show surprising results about frictional interfaces coated by thin lubricant films. Even though the frictional strength of the system is reduced by the lubricant, the fracture energy (the amount of energy dissipated per unit area) is an order of magnitude higher than in the case of dry friction. Fracture mechanics provide a new way to view the complex dynamics of the lubricated layer.
The transition from static to sliding friction is mediated by interfacial shear cracks. These cracks break the solid contacts that form rough frictional interfaces and are quantitatively described in term of fracture mechanics. First, we will focus on arrested frictional ruptures that serve as precursors to sliding motion. We will show that fracture mechanics describe the spontaneous arrest of these precursory ruptures. This result shed light on the actively debated question in seismology of the selection of an earthquake’s magnitude and arrest. Then, we will show surprising results about frictional interfaces coated by thin lubricant films. Even though the frictional strength of the system is reduced by the lubricant, the fracture energy (the amount of energy dissipated per unit area) is an order of magnitude higher than in the case of dry friction. Fracture mechanics provide a new way to view the complex dynamics of the lubricated layer.
Practical information
- Expert
- Free
- This event is internal
Organizer
- IGM
Contact
- Géraldine Palaj