Relaxation Tribometry: A Generic Method to Identify the Nature of Contact Forces
arXiv:1904.12508 · doi:10.1007/s11249-019-1168-5
Abstract
Recent years have witnessed the development of so-called relaxation tribometers, the free oscillation of which is altered by the presence of frictional stresses within the contact. So far, analysis of such oscillations has been restricted to the shape of their decaying envelope, to identify in particular solid or viscous friction components. Here, we present a more general expression of the forces possibly acting within the contact , and retain six possible, physically relevant terms. Two of them, which had never been proposed in the context of relaxation tribometry, only affect the oscillation frequency, not the amplitude of the signal. We demonstrate that each of those six terms has a unique signature in the time-evolution of the oscillation, which allows efficient identification of their respective weights in any experimental signal. We illustrate our methodology on a PDMS sphere/glass plate torsional contact.
References in corpus (8)
- Solid Friction from stick-slip to pinning and aging
- Continuum contact models for coupled adhesion and friction
- Slow rupture of frictional interfaces
- Slow slip and the transition from fast to slow fronts in the rupture of frictional interfaces
- Normal contact and friction of rubber with model randomly rough surfaces
- Stress Field at a Sliding Frictional Contact: Experiments and Calculations
- History-dependent friction and slow slip from time-dependent microscopic junction laws studied in a statistical framework
- Friction laws from dimensional-analysis point of view