Объединённый семинар ЛДУ ИГиЛ СО РАН и ЛНПГС НГУ

Объединённый семинар
Лаборатории дифференциальных уравнений ИГиЛ СО РАН и
Лаборатории нелинейных процессов в гидродинамических системах НГУ

Четверг, 28 сентября 2017 г., 15:00, конференц-зал ИГиЛ СО РАН

S. Santucci (Laboratoire de Physique, CNRS, Ecole Normale Supérieure de Lyon, Université de Lyon, France)
Aftershocks in Slow Crack Growth?

A large number of very different physical systems ranging from the microscop-ic plastic deformation of materials to earthquakes can display an intermittent avalanche dynamics – also called “Crackling Noise” – sequence of burst events, power-law distributed in size and duration. Moreover, these events are usually temporally correlated, evidenced by power-law distributed waiting times separat-ing two consecutive bursts.

In this talk, I will discuss the statistics of those waiting times between subse-quent burst events, and, in particular the possible detection of aftershocks that may occur during the slow crack growth along a weak heterogeneous plane of a transparent Plexiglas block. This interfacial crack propagation is directly ob-served by a high resolution and high-speed camera. It displays an intermittent avalanche dynamics. However, interestingly, we could show –helped by numeri-cal simulations– how inter-event correlations could arise simply from the thresh-olding procedure used to define the avalanches [Janicevic et al, (2016)].

S. Janicevic, L. Laurson, K. J. Måløy, S. Santucci, and M. J. Alava, Inter-event Correlations from Avalanches Hiding Below the Detection Threshold Phys. Rev. Lett. 117, 230601 (2016)