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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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2.

001-es BibID:BIBFORM069501
035-os BibID:(Scopus)84996865562 (WoS)000388278300006
Első szerző:Pál Gergő (fizikus)
Cím:Fragmentation and shear band formation by slow compression of brittle porous media / Gergő Pál, Zoltán Jánosi, Ferenc Kun, Ian G. Main
Dátum:2016
ISSN:2470-0045 2470-0053
Megjegyzések:Localized fragmentation is an important phenomenon associated with the formation of shear bands and faults ingranular media. It can be studied by empirical observation, by laboratory experiment, or by numerical simulation.Here we investigate the spatial structure and statistics of fragmentation using discrete element simulations of thestrain-controlled uniaxial compression of cylindrical samples of different finite size. As the system approachesfailure, damage localizes in a narrow shear band or synthetic fault "gouge" containing a large number of poorlysorted noncohesive fragments on a broad bandwidth of scales, with properties similar to those of natural andexperimental faults. We determine the position and orientation of the central fault plane, the width of the shearband, and the spatial and mass distribution of fragments. The relative width of the shear band decreases as apower law of the system size, and the probability distribution of the angle of the central fault plane converges toaround 30 degrees, representing an internal coefficient of friction of 0.7 or so. The mass of fragments is powerlaw distributed, with an exponent that does not depend on scale, and is near that inferred for experimental andnatural fault gouges. The fragments are in general angular, with a clear self-affine geometry. The consistencyof this model with experimental and field results confirms the critical roles of preexisting heterogeneity, elasticinteractions, and finite system size to grain size ratio on the development of shear bands and faults in porousmedia.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
shear band
porous material
discrete element model
quasi-static fragmentation
Megjelenés:Physical Review E. - 94 : 5 (2016), p. 053003-1 - 053003-8. -
További szerzők:Jánosi Zoltán Kun Ferenc (1966-) (fizikus) Main, Ian G.
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3.

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.
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4.

001-es BibID:BIBFORM057750
Első szerző:Pál Gergő (fizikus)
Cím:Emergence of energy dependence in the fragmentation of heterogeneous materials / Gergő Pál, Imre Varga, Ferenc Kun
Dátum:2014
ISSN:2470-0045 2470-0053
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Physical Review E. - 90 : 6 (2014), p. 062811-1 - 062811-8. -
További szerzők:Varga Imre (1979-) (fizikus, informatikus) Kun Ferenc (1966-) (fizikus)
Pályázati támogatás:TÁMOP-4.2.2.A-11/1/KONV-2012-0036
TÁMOP
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5.

001-es BibID:BIBFORM018529
Első szerző:Pál Gergő (fizikus)
Cím:Attraction-driven aggregation of dipolar particles in an external magnetic field / Gergő Pál, Ferenc Kun, Imre Varga, Dóra Sohler, Gang Sun
Dátum:2011
ISSN:2470-0045 2470-0053
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Fizikai-, Számítás- és Anyagtudomány
aggregation
Megjelenés:Physical Review E. - 83 : 6 (2011), p. 061504-1 - 061504-7. -
További szerzők:Kun Ferenc (1966-) (fizikus) Varga Imre (1979-) (fizikus, informatikus) Sohler Dóra Sun, Gang
Pályázati támogatás:TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
Nem-egyensúlyi rendszerek statisztikus fizikája
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