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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.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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