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001-es BibID:	BIBFORM069498
035-os BibID:	(Scopus)84963599543 (WoS)000373108700005
Első szerző:	Pál Gergő (fizikus)
Cím:	Record-breaking events during the compressive failure of porous materials / Gergő Pál, Frank Raischel, Sabine Lennartz-Sassinek, Ferenc Kun, Ian G. Main
Dátum:	2016
ISSN:	2470-0045 2470-0053
Megjegyzések:	An accurate understanding of the interplay between random and deterministic processes in generating extremeevents is of critical importance in many fields, from forecasting extreme meteorological events to the catastrophicfailure of materials and in the Earth. Here we investigate the statistics of record-breaking events in the time seriesof crackling noise generated by local rupture events during the compressive failure of porous materials. Theevents are generated by computer simulations of the uniaxial compression of cylindrical samples in a discreteelement model of sedimentary rocks that closely resemble those of real experiments. The number of recordsgrows initially as a decelerating power law of the number of events, followed by an acceleration immediatelyprior to failure. The distribution of the size and lifetime of records are power laws with relatively low exponents.We demonstrate the existence of a characteristic record rank k ? , which separates the two regimes of the timeevolution. Up to this rank deceleration occurs due to the effect of random disorder. Record breaking thenaccelerates towards macroscopic failure, when physical interactions leading to spatial and temporal correlationsdominate the location and timing of local ruptures. The size distribution of records of different ranks has auniversal form independent of the record rank. Subsequences of events that occur between consecutive recordsare characterized by a power-law size distribution, with an exponent which decreases as failure is approached.High-rank records are preceded by smaller events of increasing size and waiting time between consecutive eventsand they are followed by a relaxation process. As a reference, surrogate time series are generated by reshufflingthe event times. The record statistics of the uncorrelated surrogates agrees very well with the correspondingpredictions of independent identically distributed random variables, which confirms that temporal and spatialcorrelation in the crackling noise is responsible for the observed unique behavior. In principle the results couldbe used to improve forecasting of catastrophic failure events, if they can be observed reliably in real time.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk shear band formation earthquake macroscopic failure discrete element model
Megjelenés:	Physical Review E. - 93 : 3 (2016), p. 033006-1 - 033006-10. -
További szerzők:	Raischel, Frank Lennartz-Sassinek, Sabine Kun Ferenc (1966-) (fizikus) Main, Ian G.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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