Special Nonlinear Seminar: "Dynamics of friction between dissimilar materials"

Date: 
Wed, 14/03/201812:00-13:30
Location: 
Danciger B building, Seminar room
Lecturer: Miss Hadar Shlomai , HUJI
Abstract:
The most general frictional motion in nature involves bimaterial interfaces, interfaces composed of ‎contacting bodies with different elastic properties.
Frictional motion can initiate only after the contacts composing the interface between compressed ‎bodies detach via propagating rupture fronts.‎
The symmetry breaking across the interface results in coupling between local slip (local motion) and normal stress ‎variations at the interface and gives rise to very rich dynamics of how detachment along the interface takes place. These dynamics include rupture ‎modes that are qualitative different than those along interfaces separating identical materials.‎
The most significant rupture type that is unique to bimaterial interfaces are called slip pulses. These are characterized by highly ‎localized slip accompanied by a large local reduction of the normal stress near the rupture tip.‎
For decades this class of rupture, which is thought to reduce frictional dissipation,  was theoretically expected, but never clearly observed.‎
Here, I will present the characteristic features of bimaterial frictional systems and focus on the structure and evolution of these slip pulses that, for the first time, are experimentally observed.