Onset and stabilization of frictional motion
Event details
| Date | 24.11.2011 |
| Hour | 11:00 |
| Speaker | Dr. Rosario Capozza |
| Location |
GC A1 416
|
| Category | Conferences - Seminars |
Recent experiments show that the onset of frictional motion and the associated stick-slip are ruled by the complex rupture processes of microscopic contacts forming the interface of two contacting bodies.
Two examples of this complexity are the stochasticity associated to the stick-slip motion (e.g. irregularity in the intervals between slip events) and the variability of static friction coefficient that, in contrast to the common belief, is not a material constant.
In the first case, applying small-amplitude oscillations to the shear force, we show, experimentally and theoretically, that the stick-slip periods synchronize. We further show that this phase locking is related to the inhibition of slow rupture modes which forces a transition to fast rupture, providing a possible mechanism for observed remote triggering of earthquakes.
In the second case we provide a theoretical framework for understanding how and why for the same material the measured values of static friction coefficient can vary within wide limits. More specifically, we show:
- What are the maximal and minimal values of static friction for the same material and normal load.
- What is a relation between the measured value of static friction and the state of the slider and how to characterize this state.
- What is the effect of loading configuration on static friction.
Links
Practical information
- General public
- Free
Contact
- Vladislav Yastrebov