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001-es BibID:	BIBFORM106122
035-os BibID:	(cikkazonosító)063121 (WoS)000812354100003 (Scopus)85132037842
Első szerző:	Batool, Attia
Cím:	Temporal evolution of failure avalanches of the fiber bundle model on complex networks / Attia Batool, Zsuzsa Danku, Gergő Pál, Ferenc Kun
Dátum:	2022
ISSN:	1054-1500 1089-7682
Megjegyzések:	We investigate how the interplay of the topology of the network of load transmitting connections and the amount of disorder of the strength of the connected elements determines the temporal evolution of failure cascades driven by the redistribution of load following local failure events. We use the fiber bundle model of materials' breakdown assigning fibers to the sites of a square lattice, which is then randomly rewired using the Watts?Strogatz technique. Gradually increasing the rewiring probability, we demonstrate that the bundle undergoes a transition from the localized to the mean field universality class of breakdown phenomena. Computer simulations revealed that both the size and the duration of failure cascades are power law distributed on all network topologies with a crossover between two regimes of different exponents. The temporal evolution of cascades is described by a parabolic profile with a right handed asymmetry, which implies that cascades start slowly, then accelerate, and eventually stop suddenly. The degree of asymmetry proved to be characteristic of the network topology gradually decreasing with increasing rewiring probability. Reducing the variance of fibers' strength, the exponents of the size and the duration distribution of cascades increase in the localized regime of the failure process, while the localized to mean field transition becomes more abrupt. The consistency of the results is supported by a scaling analysis relating the characteristic exponents of the statistics and dynamics of cascades.
Tárgyszavak:	Természettudományok Fizikai tudományok kutatási jelentés folyóiratcikk
Megjelenés:	Chaos. - 32 : 6 (2022), p. 1-10. -
További szerzők:	Danku Zsuzsa (1984-) (fizikus) Pál Gergő (1987-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:	EFOP-3.6.1-16-2016-00022 EFOP K 119967 Egyéb
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001-es BibID:	BIBFORM106120
035-os BibID:	(cikkazonosító)112190 (WoS)000881271500010 (Scopus)85129920978
Első szerző:	Batool, Attia
Cím:	Transition from localized to mean field behaviour of cascading failures in the fiber bundle model on complex networks / Attia Batool, Gergő Pál, Zsuzsa Danku, Ferenc Kun
Dátum:	2022
ISSN:	0960-0779
Megjegyzések:	We study the failure process of fiber bundles on complex networks focusing on the effect of the degree of disorder of fibers' strength on the transition from localized to mean field behaviour. Starting from a regular square lattice we apply the Watts-Strogatz rewiring technique to introduce long range random connections in the load transmission network and analyze how the ultimate strength of the bundle and the statistics of the size of failure cascades change when the rewiring probability is gradually increased. Our calculations revealed that the degree of strength disorder of nodes of the network has a substantial effect on the localized to mean field transition. In particular, we show that the transition sets on at a finite value of the rewiring probability, which shifts to higher values as the degree of disorder is reduced. The transition is limited to a well defined range of disorder, so that there exists a threshold disorder of nodes' strength below which the randomization of the network structure does not provide any improvement neither of the overall load bearing capacity nor of the cascade tolerance of the system. At low strength disorder the fully random network is the most stable one, while at high disorder best cascade tolerance is obtained at a lower structural randomness. Based on the interplay of the network structure and strength disorder we construct an analytical argument which provides a reasonable description of the numerical findings.
Tárgyszavak:	Természettudományok Fizikai tudományok kutatási jelentés folyóiratcikk
Megjelenés:	Chaos Solitons & Fractals. - 159 (2022), p. 1-11. -
További szerzők:	Pál Gergő (1987-) (fizikus) Danku Zsuzsa (1984-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:	EFOP-3.6.1-16-2016-00022 EFOP K 11996 Egyéb
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001-es BibID:	BIBFORM104097
035-os BibID:	(cikkazonosító)042116 (WOS)000579816300001 (Scopus)85093109330
Első szerző:	Batool, Attia
Cím:	Impact-induced transition from damage to perforation / Attia Batool, Gergő Pál, Ferenc Kun
Dátum:	2020
ISSN:	2470-0045 2470-0053
Megjegyzések:	We investigate the impact-induced damage and fracture of a bar-shaped specimen of heterogeneous materials focusing on how the system approaches perforation as the impact energy is gradually increased. A simple model is constructed which represents the bar as two rigid blocks coupled by a breakable interface with disordered local strength. The bar is clamped at the two ends, and the fracture process is initiated by an impactor hitting the bar in the middle. Our calculations revealed that depending on the imparted energy, the system has two phases: at low impact energies the bar suffers damage but keeps its integrity, while at sufficiently high energies, complete perforation occurs. We demonstrate that the transition from damage to perforation occurs analogous to continuous phase transitions. Approaching the critical point from below, the intact fraction of the interface goes to zero, while the deformation rate of the bar diverges according to power laws as function of the distance from the critical energy. As the degree of disorder increases, farther from the transition point the critical exponents agree with their zero disorder counterparts; however, close to the critical point a crossover occurs to a higher exponent.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Physical Review E. - 102 : 4 (2020), p. 1-11. -
További szerzők:	Pál Gergő (1987-) (fizikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:	EFOP-3.6.1-16-2016-00022 EFOP NKFIH-K-119967 Egyéb ED18-1-2019-0028 Egyéb
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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
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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