English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The transition from stick to slip at a dry frictional interface occursthrough the breaking of the junctions between the two contacting surfaces.Typically, interactions between the junctions through the bulk lead to rupturefronts propagating from weak and/or highly stressed regions, whose junctionsbreak first. Experiments find rupture fronts ranging from quasi-static frontswith speeds proportional to external loading rates, via fronts much slower thanthe Rayleigh wave speed, and fronts that propagate near the Rayleigh wavespeed, to fronts that travel faster than the shear wave speed. The mechanismsbehind and selection between these fronts are still imperfectly understood.Here we perform simulations in an elastic 2D spring--block model where thefrictional interaction between each interfacial block and the substrate arisesfrom a set of junctions modeled explicitly. We find that a proportionalitybetween material slip speed and rupture front speed, previously reported forslow fronts, actually holds across the full range of front speeds we observe.We revisit a mechanism for slow slip in the model and demonstrate that fastslip and fast fronts have a different, inertial origin. We highlight the longtransients in front speed even in homogeneous interfaces, and we study how boththe local shear to normal stress ratio and the local strength are involved inthe selection of front type and front speed. Lastly, we introduce anexperimentally accessible integrated measure of block slip history, the Ginicoefficient, and demonstrate that in the model it is a good predictor of thehistory-dependent local static friction coefficient of the interface. Theseresults will contribute both to building a physically-based classification ofthe various types of fronts and to identifying the important mechanismsinvolved in the selection of their propagation speed.

On the speed of fast and slow rupture fronts along frictional interfaces