Results 261 to 270 of about 21,573 (293)

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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Elastic Contact on Rough Fracture Surfaces

Europhysics Letters (EPL), 1993
There is now ample evidence that fracture surfaces are self-affine. The elastic contact on such surfaces is expected to give rise to a power law dependence of the normal force on the penetration depth, whose exponent α depends on the roughness index of the surface, ζ.
K. J Måløy, Xiao-Lun Wu, A Hansen, S Roux   +3 more
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High-velocity flow in a rough fracture

Journal of Fluid Mechanics, 1999
We simulate high-velocity flow in a self-affine channel with a constant perpendicular opening by solving numerically the Navier–Stokes equations, and analyse the resulting flow qualitatively and quantitatively. At low velocity, i.e. vanishing inertia, the effective permeability is dominated by the narrowest constrictions measured perpendicular ...
Skjetne, E., Hansen, A., Gudmundsson, J. S.   +2 more
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Fracture roughness and physical implications

2008
A large number of studies of fracture surface topography have revealed that for a wide class of materials, and fracture conditions, the surfaces exhibit a self-affine character. Moreover, the roughness exponent which characterizes this self-affinity appears to be universal. In this paper, we analyse some physical consequences of this property.
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Roughness characterization of fractures surfaces

2006
This paper presents a comparative study of various methods of roughness quantification applied to rock fractures. The parameters which are discussed and used for comparing 7 types of rock and two failure mode are : arithmetic mean value, quadratic mean value (and standard deviation of peaks heights), JRC and estimations of the fractal dimension by the ...
Legrain, Hughes, Tshibangu, Katshidikaya
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Fluid flow through rough fractures in rocks. II: A new matching model for rough rock fractures

Earth and Planetary Science Letters, 2006
Abstract An understanding of fluid flow through natural fractures in rocks is important in many areas, such as in the hydrocarbon and water industries, and in the safe design of disposal sites for domestic, industrial and nuclear waste. It is often impractical to obtain this information by field or laboratory scale measurements, so numerical ...
Steven R. Ogilvie, Evgeny Isakov, Paul W.J. Glover   +2 more
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Better Rough Than Scarce: Proximal Femur Fracture Segmentation With Rough Annotations

IEEE Transactions on Medical Imaging
Proximal femoral fracture segmentation in computed tomography (CT) is essential in the preoperative planning of orthopedic surgeons. Recently, numerous deep learning-based approaches have been proposed for segmenting various structures within CT scans. Nevertheless, distinguishing various attributes between fracture fragments and soft tissue regions in
Xu Lu, Zengzhen Cui, Yihua Sun, Hee Guan Khor, Ao Sun, Longfei Ma, Fang Chen 0007, Shan Gao, Yun Tian 0006, Fang Zhou, Yang Lv, Hongen Liao   +11 more
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