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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
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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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
Borító:
Saját polcon: