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001-es BibID:BIBFORM100226
035-os BibID:(cikkazonosító)033001 (Scopus)85029848392 (WoS)000409261800015
Első szerző:Kádár Viktória (okleveles anyagkutató)
Cím:Size scaling of failure strength with fat-tailed disorder in a fiber bundle model / Kádár Viktória, Danku Zsuzsa, Kun Ferenc
Dátum:2017
ISSN:2470-0045 2470-0053
Megjegyzések:We investigate the size scaling of the macroscopic fracture strength of heterogeneous materials when microscopic disorder is controlled by fat-tailed distributions. We consider a fiber bundle model where the strength of single fibers is described by a power law distribution over a finite range. Tuning the amount of disorder by varying the power law exponent and the upper cutoff of fibers' strength, in the limit of equal load sharing an astonishing size effect is revealed: For small system sizes the bundle strength increases with the number of fibers, and the usual decreasing size effect of heterogeneous materials is restored only beyond a characteristic size. We show analytically that the extreme order statistics of fibers' strength is responsible for this peculiar behavior. Analyzing the results of computer simulations we deduce a scaling form which describes the dependence of the macroscopic strength of fiber bundles on the parameters of microscopic disorder over the entire range of system sizes.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review E. - 96 : 3 (2017), p.1-6. -
További szerzők:Danku Zsuzsa (1984-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:K119967
Egyéb
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2.

001-es BibID:BIBFORM100227
035-os BibID:(cikkazonosító)127015 (WoS)000793673500016 (Scopus)85125850119
Első szerző:Kádár Viktória (okleveles anyagkutató)
Cím:Approach to failure through record breaking avalanches in a heterogeneous stress field / Kádár Viktória, Danku Zsuzsa, Pál Gergő, Kun Ferenc
Dátum:2022
ISSN:0378-4371
Megjegyzések:We study how the competition of the disordered local strength and of the evolving inhomogeneous stress field affects the evolution of the series of breaking avalanches accompanying the fracture of heterogeneous materials. To generate fracture processes, we use a fiber bundle model of localized load sharing where the degree of strength disorder is controlled by varying two parameters of the distribution of the breaking threshold of fibers. Analyzing the record statistics of avalanches of breaking fibers, we demonstrate that both for low and high disorders the series of crackling events remains stationary until global failure making the collapse of the system unpredictable. Based on computer simulations, we determine a region of the parameter plane of strength disorder where global failure is preceded by an accelerating breaking activity. We show that the record avalanche with the longest lifetime can be used to identify the onset of acceleration of the fracture process towards the catastrophic failure. Comparison of the results to their equal load sharing counterparts reveals that the accelerating regime is shorter than in case of a homogeneous stress field due to the higher degree of brittleness of the system caused by stress localization.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
crackling noise
failure
fracture
ultimate failure
fiber bundle model
record statistics
Megjelenés:Physica A-Statistical Mechanics And Its Applications. - 594 (2022), p. 1-12. -
További szerzők:Danku Zsuzsa (1984-) (fizikus) Pál Gergő (1987-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:UNKP-20-3
Egyéb
K 119967
Egyéb
2020-4.1.1-TKP2020
Egyéb
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Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM093732
035-os BibID:(Cikkazonosító)2508 (WOS)000562887700005 (Scopus)85079336571
Első szerző:Kádár Viktória (okleveles anyagkutató)
Cím:Record statistics of bursts signals the onset of acceleration towards failure / Kádár Viktória, Pál Gergő, Kun Ferenc
Dátum:2020
ISSN:2045-2322
Megjegyzések:Forecasting the imminent catastrophic failure has a high importance for a large variety of systems from the collapse of engineering constructions, through the emergence of landslides and earthquakes, to volcanic eruptions. Failure forecast methods predict the lifetime of the system based on the time-to-failure power law of observables describing the final acceleration towards failure. We show that the statistics of records of the event series of breaking bursts, accompanying the failure process, provides a powerful tool to detect the onset of acceleration, as an early warning of the impending catastrophe. We focus on the fracture of heterogeneous materials using a fiber bundle model, which exhibits transitions between perfectly brittle, quasi-brittle, and ductile behaviors as the amount of disorder is increased. Analyzing the lifetime of record size bursts, we demonstrate that the acceleration starts at a characteristic record rank, below which record breaking slows down due to the dominance of disorder in fracturing, while above it stress redistribution gives rise to an enhanced triggering of bursts and acceleration of the dynamics. The emergence of this signal depends on the degree of disorder making both highly brittle fracture of low disorder materials, and ductile fracture of strongly disordered ones, unpredictable.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
előrejelzés
törés
rekord statisztika
rendezetlenség
Megjelenés:Scientific Reports. - 10 : 1 (2020), p. 1-12. -
További szerzők:Pál Gergő (1987-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
NKFIH K-16 K119967
Egyéb
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM088104
035-os BibID:(cikkazonosító)053001 (Scopus)85075056631 (WoS)000494457300003
Első szerző:Kádár Viktória (okleveles anyagkutató)
Cím:System-size-dependent avalanche statistics in the limit of high disorder / Kádár Viktória, Kun Ferenc
Dátum:2019
ISSN:2470-0045 2470-0053
Megjegyzések:We investigate the effect of the amount of disorder on the statistics of breaking bursts during the quasistatic fracture of heterogeneous materials. We consider a fiber bundle model where the strength of single fibers is sampled from a power-law distribution over a finite range, so that the amount of materials' disorder can be controlled by varying the power-law exponent and the upper cutoff of fibers' strength. Analytical calculations and computer simulations, performed in the limit of equal load sharing, revealed that depending on the disorder parameters the mechanical response of the bundle is either perfectly brittle where the first fiber breaking triggers a catastrophic avalanche, or it is quasibrittle where macroscopic failure is preceded by a sequence of bursts. In the quasibrittle phase, the statistics of avalanche sizes is found to show a high degree of complexity. In particular, we demonstrate that the functional form of the size distribution of bursts depends on the system size: for large upper cutoffs of fibers' strength, in small systems the sequence of bursts has a high degree of stationarity characterized by a power-law size distribution with a universal exponent. However, for sufficiently large bundles the breaking process accelerates towards the critical point of failure, which gives rise to a crossover between two power laws. The transition between the two regimes occurs at a characteristic system size which depends on the disorder parameters.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical review. E. - 100 : 5 (2019), p. 1-9. -
További szerzők:Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM116492
035-os BibID:(cikkazonosító)19733 (WoS)001104940600020 (Scopus)85176441719
Első szerző:Pál Gergő (fizikus)
Cím:Scaling laws of failure dynamics on complex networks / Gergő Pál, Zsuzsa Danku, Attia Batool, Viktória Kádár, NaokiYoshioka, Nobuyasu Ito, Géza Ódor, Ferenc Kun
Dátum:2023
ISSN:2045-2322
Megjegyzések:The topology of the network of load transmitting connections plays an essential role in the cascading failure dynamics of complex systems driven by the redistribution of load after local breakdown events. In particular, as the network structure is gradually tuned from regular to completely random a transition occurs from the localized to mean field behavior of failure spreading. Based on finite size scaling in the fiber bundle model of failure phenomena, here we demonstrate that outside the localized regime, the load bearing capacity and damage tolerance on the macro-scale, and the statistics of clusters of failed nodes on the micro-scale obey scaling laws with exponents which depend on the topology of the load transmission network and on the degree of disorder of the strength of nodes. Most notably, we show that the spatial structure of damage governs the emergence of the localized to mean field transition: as the network gets gradually randomized failed clusters formed on locally regular patches merge through long range links generating a percolation like transition which reduces the load concentration on the network. The results may help to design network structures with an improved robustness against cascading failure.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
complex networks
scaling laws
Megjelenés:Scientific Reports. - 13 : 1 (2023), p. 1-12. -
További szerzők:Danku Zsuzsa (1984-) (fizikus) Batool, Attia Kádár Viktória (1992-) (okleveles anyagkutató) Yoshioka, Naoki Ito, Nobuyasu Ódor Géza Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:EFOP-3.6.1-16-2016-00022
EFOP
K 119967
OTKA
K 128989
OTKA
TKP2020-NKA-0
Egyéb
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DOI
Intézményi repozitóriumban (DEA) tárolt változat
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