Critical slip and time dependence in sea ice friction

Critical slip and time dependence in sea ice friction

Friction Fluctuations and Friction Memory in Stick-Slip Motion.

We demonstrate that friction is not always an exact number. In a simple lubricated system (atomically smooth mica separated by molecularly thin films of squalane), sinusoidal shear forces were applied for millions of cycles. The kinetic friction increased steadily over repetitive cycles and collapsed intermittently to the average value. Individual slip cycles also consisted of a cascade of smal...

Stabilizing stick-slip friction.

Even the most regular stick-slip frictional sliding is always stochastic, with irregularity in both the intervals between slip events and the sizes of the associated stress drops. 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 slo...

Static Friction, Healing, and Constitutive Laws for Time- and Slip-dependent Friction

I summarize laboratory friction experiments on quartz powder sheared at room temperature and humidity. Slide-hold-slide experiments indicate that static friction and related parameters vary systematically with both hold time and loading velocity. The data indicate that healing is closely related to gouge porosity and that static friction and healing are not simple friction parameters, but rathe...

Temperature dependence of beam scattering in young sea ice.

Laboratory measurements of the upward intensity distribution in young thin sea ice illustrate the variation of this distribution and peak intensity with growth temperature and ice thickness.