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001-es BibID:	BIBFORM085954
Első szerző:	D'Addetta, Gian Antonio
Cím:	On the application of a discrete model to the fracture process of cohesive granular materials / G. A. D'Addetta, F. Kun, E. Ramm
Dátum:	2002
ISSN:	1434-5021 1434-7636
Megjegyzések:	We present a two-dimensional model of heterogeneous cohesive frictional solids where the material structure is idealized by a discrete granular particle assembly. Our discrete model is composed of convex polygons which are linked together by simple beams accounting for cohesive effects. Varying its parameters the model naturally interpolates between a continuous solid state and a discontinuous dry granular state of the material. We performed simulations of the quasi-static uniaxial loading with two different boundary conditions, and shearing of a solid. To provide a geometrical description of the damage state, and of the microscopic fracture events, different characteristic quantities will be introduced and their relevance will be examined. The results obtained from simulations are in satisfactory agreement with experimental observations.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk DEM Lattice Discrete simulation Cohesive frictional materials Fracture Microfailure
Megjelenés:	Granular Matter. - 4 : 2 (2002), p. 77-90. -
További szerzők:	Kun Ferenc (1966-) (fizikus) Ramm, E.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM069499
Első szerző:	Pál Gergő (fizikus)
Cím:	Mass-velocity correlation in impact induced fragmentation of heterogeneous solids / Gergő Pál, Ferenc Kun
Dátum:	2016
ISSN:	1434-5021 1434-7636
Megjegyzések:	We study the impact fragmentation of disorderedsolids by means of a discrete element model focusing on the velocity and mass-velocity correlation of fragments. Simula-tions are performed with plate-like objects varying the platethickness and the impact velocity in broad ranges. Dependingon the impact velocity the breakup process has two differentoutcomes: at low velocities the sample gets only damaged,to achieve fragmentation, where no large residues survive,the impact velocity has to surpass a critical value. In thefragmented phase the velocity components of fragments arepower law distributed with a stretched exponential cutoff,where the impact velocity and plate thickness mainly controlthe standard deviation of the distributions. Mass velocity cor-relation is only pointed out for thin plates, while it disappearsfor three-dimensional bulk samples. In the damage phase ofthin plates the mass and velocity of fragments proved to bestrongly correlated, however, in the fragmented phase corre-lation occurs in the vicinity of the critical velocity and it islimited to the large fragments only. The correlation functiondecays as a power law with different exponents for small andlarge fragments in good agreement with recent experimentalfindings. We show that the mass-velocity correlation origi-nates from the spatial dependence of the mass and velocityof pieces inside the fragmenting body.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban discrete element model mass-velocity correlation fragmentation dimensionality velocity distribution
Megjelenés:	Granular Matter 18 : 74 (2016), p. 1-11. -
További szerzők:	Kun Ferenc (1966-) (fizikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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