TY - JOUR
T1 - Modelling the mechanical structure of extreme shear ruptures with friction approaching zero generated in brittle materials
AU - Tarasov, Boris G.
AU - Guzev, Mikhail A.
AU - Sadovskii, Vladimir M.
AU - Cassidy, Mark J.
PY - 2017/9
Y1 - 2017/9
N2 - Experiments on frictional stick-slip instability in brittle materials and natural observations show that friction falls towards zero in the head of shear ruptures propagating with extreme velocities (up to supershear levels). Although essential for understanding earthquakes, fracture mechanics and tribology the question of what physical processes determine how weakening occurs is still unclear. Here, using a mathematical model, we demonstrate that the extremely low friction can be caused by a fan-like fault structure formed on the basis of a tensile-cracking process observed in all extreme ruptures. The mathematical model visualises and describes the fan-structure as a mechanical system during rupture propagation. It explains some features observed in laboratory experiments.
AB - Experiments on frictional stick-slip instability in brittle materials and natural observations show that friction falls towards zero in the head of shear ruptures propagating with extreme velocities (up to supershear levels). Although essential for understanding earthquakes, fracture mechanics and tribology the question of what physical processes determine how weakening occurs is still unclear. Here, using a mathematical model, we demonstrate that the extremely low friction can be caused by a fan-like fault structure formed on the basis of a tensile-cracking process observed in all extreme ruptures. The mathematical model visualises and describes the fan-structure as a mechanical system during rupture propagation. It explains some features observed in laboratory experiments.
KW - Low friction
KW - Mathematical modelling
KW - Shear rupture mechanism
KW - Shear ruptures of extreme dynamics
KW - Structure of shear rupture
UR - http://www.scopus.com/inward/record.url?scp=85021140888&partnerID=8YFLogxK
U2 - 10.1007/s10704-017-0223-1
DO - 10.1007/s10704-017-0223-1
M3 - Article
AN - SCOPUS:85021140888
VL - 207
SP - 87
EP - 97
JO - International Journal of Fracture
JF - International Journal of Fracture
SN - 0376-9429
IS - 1
ER -