Results 261 to 270 of about 111,470 (303)

Transition from linear to nonlinear flow in single rough fractures: effect of fracture roughness

Hydrogeology Journal, 2021
A series of laboratory experiments on water flow through rough fractures was performed using self-designed experimental devices to investigate the effect of fracture roughness on the flow behavior. Nine models of single rough fractures—with three joint roughness coefficients (JRCs) of 0–2, 8–10 and 18–20, and three apertures for each JRC—were prepared ...
Jie Liu, Zhechao Wang, Liping Qiao, Wei Li, Jinjin Yang   +4 more
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Simulation of chemical erosion in rough fractures

Physical Review E, 2002
We report on numerical simulations of acid erosion in a fractured specimen of Carrara marble. The simulations combine two recent advances in lattice-Boltzmann methodology to accurately and efficiently calculate the velocity field in the pore space. A tracer diffusion algorithm was then used to calculate the distribution of reactants in the fracture ...
R, Verberg, A J C, Ladd
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On the universality of fracture surface roughness

Europhysics Letters (EPL), 1996
We measure the roughness of fracture surfaces generated in uniaxial tension for model materials in two and three dimensions. We study the effect of disorder, of anisotropy of material properties and of dimensionality on surface roughness. Although the roughness exponent ζ is always found within a narrow range, its value systematically decreases as the ...
Xiaodong Zhang, M. A Knackstedt, D. Y. C Chan, L Paterson   +3 more
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Fracture surface micro-roughness

Scripta Metallurgica, 1984
The small-scale roughness of a fracture surface (a scale typically of a few micrometers) has been of interest for some time. That interest has received an impetus in recent years because it relates to mechanisms of fatigue crack propagation mechanisms determining the fracture toughness and mechanisms of creep fracture.
A.W. Thompson, M.F. Ashby
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Fracture Toughness and Fracture Roughness in Anisotropic Granitic Rocks

Rock Mechanics and Rock Engineering, 2009
In this paper we present an experimental approach aimed at assessing the correlation between fracture toughness (K IC) and fracture roughness of two granitic rocks (Barre and Stanstead granites) exhibiting significant fracture toughness anisotropy. Roughness values have been estimated for fractured surfaces obtained from Chevron
M. H. B. Nasseri, G. Grasselli, B. Mohanty   +2 more
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Mapping of the Roughness Exponent for the Fuse Model for Fracture

Physical Review Letters, 2008
The roughness exponent for fracture surfaces in the fuse model has been thought to be universal for narrow threshold distributions and has been important in the numerical studies of fracture roughness. We show that the fuse model gives a disorder dependent roughness exponent for narrow disorders when the lattice is influencing the fracture growth. When
Jan Oystein Haavig, Bakke, Alex, Hansen
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Nonuniversality of roughness exponent of quasistatic fracture surfaces

Physical Review E, 2012
Numerous experiments have indicated that the fracture front (in three dimensions) and crack lines (in two dimensions) in disordered solids and rocklike materials is rough. It has been argued that the roughness exponent ζ is universal. Using extensive simulations of a two-dimensional model, we provide strong evidence that if extended correlations and ...
Mehdi, Ansari-Rad, S Mehdi Vaez, Allaei, Muhammad, Sahimi   +2 more
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Fluid Flow In Rough Fractures

All Days, 1963
Parrish, David R., Member AIME, Pan American Petroleum Corp., Tulsa, Oklahoma Publication Rights Reserved This paper was presented at the University of Oklahoma-SPE Production Research Symposium in Norman, Okla., April 29–30, 1963, and is considered the property of the Society of Petroleum Engineers.
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Fracture surfaces: Apparent roughness, relevant length scales, and fracture toughness

Physical Review B, 1994
The Griffith criterion is rewritten to account for the propagation of a self-affine crack. It is shown that the stress-field singularity in the close vicinity of the crack tip involves an exponent -(${\mathit{d}}_{\mathit{F}}$-1)/2 instead of -1/2. Furthermore, the fracture toughness is shown to be related to the ratio of the maximum height ${\mathit{z}
, Bouchaud, , Bouchaud
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Shear Dispersion in a Rough-Walled Fracture

SPE Journal, 2018
Summary An expression is analytically presented for the shear dispersion, or Taylor (1953) and Aris (1956) dispersion, of a solute transporting in a coupled system, which consists of a matrix and a rough-walled fracture. To derive a shear-dispersion coefficient in a fracture with rough and porous walls, the continuities of solute ...
Morteza Dejam, Hassan Hassanzadeh, Zhangxin Chen   +2 more
openaire   +1 more source