Рубрики:
LABORATORY EARTHQUAKES
PULSE-LIKE
COMPRESSION
GROWTH
SLIP
STRENGTH
Кл.слова (ненормированные):
Structure of shear rupture -- Shear rupture mechanism -- Shear ruptures of -- extreme dynamics -- Low friction -- Mathematical modelling
LABORATORY EARTHQUAKES
PULSE-LIKE
COMPRESSION
GROWTH
SLIP
STRENGTH
Кл.слова (ненормированные):
Structure of shear rupture -- Shear rupture mechanism -- Shear ruptures of -- extreme dynamics -- Low friction -- Mathematical modelling
Аннотация: 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.
WOS,
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Держатели документа:
Univ Western Australia, Ctr Offshore Fdn Syst, Stirling Highway 35, Perth, WA 6009, Australia.
Russian Acad Sci, Inst Appl Math, Far Eastern Branch, Radio St 7, Vladivostok 690041, Russia.
Russian Acad Sci, Inst Computat Modelling, Siberian Branch, Akademgorodok 50-44, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Tarasov, Boris G.; Guzev, Mikhail A.; Sadovskii, Vladimir M.; Cassidy, Mark J.; Centre for Offshore Foundation Systems (COFS) at the University of Western Australia