Key role of elastic vortices in the initiation of intersonic shear cracks; Physical Review E; Vol. 91, iss. 6

Key role of elastic vortices in the initiation of intersonic shear cracks; Physical Review E; Vol. 91, iss. 6

Bibliographic Details
Parent link:Physical Review E: Scientific Journal.— , 1993-
Vol. 91, iss. 6.— 2015.— [063302]
Corporate Authors: Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Кафедра физики высоких технологий в машиностроении (ФВТМ), Национальный исследовательский Томский политехнический университет (ТПУ) Институт физики высоких технологий (ИФВТ) Кафедра физики высоких технологий в машиностроении (ФВТМ) Научно-образовательная лаборатория "Динамическое моделирование и контроль ответственных конструкций" (НОЛ ДМиК ОК)
Other Authors: Psakhie S. G. Sergey Grigorievich, Shilko E. V. Evgeny Viktorovich, Popov M. Mikhail, Popov V. L. Valentin Leonidovich
Summary:Title screen
Using the particle-based method of movable cellular automata, we analyze the initiation and propagation of intersonic mode II cracks along a weak interface. We show that the stress concentration in front of the crack tip, which is believed to be the mechanism of acceleration of the crack beyond the speed of shear waves, is due to the formation of an elastic vortex. The vortex develops in front of the crack during the short initial period of crack propagation. It expands and moves away from the crack tip and finally detaches from it. Maximum stress concentration in the vortex is achieved at the moment of detachment of the vortex. The crack can accelerate towards the longitudinal wave speed if the magnitude of shear stresses in the elastic vortex reaches the material shear strength before vortex detachment. We have found that for given material parameters, the condition for the unstable accelerated crack propagation depends only on the ratio of the initial crack length to its width (e.g., due to surface roughness).
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2015
Subjects:
электронный ресурс
труды учёных ТПУ
межзвуковые трещины
Online Access:http://dx.doi.org/10.1103/PhysRevE.91.063302
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=645395

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