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.
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.