Results 221 to 230 of about 11,269 (260)

Fracture micromechanics of human dentin: A microscale numerical model

Journal of the Mechanical Behavior of Biomedical Materials, 2021
In the present study, we investigate the effects of microstructural morphology and heterogeneity on the initiation and propagation of microcracks in dentin. We create 2D pre-cracked models of human dentin at the microscale level and use a brittle fracture framework of the phase-field method to analyze the crack growth.
Ebrahim Maghami, Reza Pejman, Ahmad R. Najafi   +2 more
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Numerical Modeling of Multilayer Fracture Treatments

Permian Basin Oil and Gas Recovery Conference, 1992
ABSTRACT A substantial proportion of hydraulic fracture treatments are performed in formation and well completion settings conducive to the extension of multiple fractures, a process not adequately described by existing hydraulic fracture simulators.
J. L. Elbel, A. R. Piggott, M. G. Mack
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Realistic Numerical Models for Fractured Reservoirs

SPE Journal, 2000
Summary Characterization and forecasting in fractured reservoirs is one of the most challenging topics in the oil and gas industry. Managing such reservoirs requires construction of representative reservoir models that can handle both fracture and matrix systems, and their interaction, correctly.
O. Gurpinar, C. A. Kossack
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Numerical Modeling of Hydraulic Fracture Growth in Fractured Reservoirs

Proceedings, 2012
Fractured reservoirs play a vital role in hydrocarbon production and development, and hydraulic fracturing is the key technology in the exploitation of fractured reservoirs. Therefore, the monitor of fracture growth during the process of hydraulic fracturing is very important for efficient production.
X. Zhang, F. Zhang, X. Y. Li, X. R. Huang   +3 more
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Numerical Modeling for Contact Fracture Problems

SAE Technical Paper Series, 2001
<div class="htmlview paragraph">This study presents a computational model to simulate the pitting or spalling in universal joints due to rolling contact fatigue. The model was simplified to two dimensions and plane strain condition was considered.
Mario Cesar Borba Santos, Oscar Aranha, Adalberto Souza, Ignácio Iturrioz, Jun Sérgio Ono Fonseca   +4 more
openaire   +1 more source

Framework and Numerical Algorithm for a Phase Field Fracture Model

East Asian Journal on Applied Mathematics, 2023
Summary: A phase field fracture model for quasi-brittle material in 2D is implemented in Abaqus software. The phase field damage variables 0 and 1 define undamaged and damaged regions of the material and simplify crack surface tracking. On the other hand, one has to use a fine spatial discretization for the smooth distribution of the phase field ...
Karthik, S., Nasedkina, A., Nasedkin, A., Rajagopal, A.   +3 more
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Numerical modelling of ductile spall fracture

International Journal of Impact Engineering, 1995
Abstract In this paper, a macroscopic constitutive equation for porous materials, which is based on a void growth model under the combined action of hydrostatic and deviatoric stresses, is presented. The formulation follows previous work by Gurson [Continuum theory of ductile rupture by void nucleation and growth: Part I—Yield criteria and flow rules
Raul Cortes, Manuel Elices
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Numerical models of shear fracture propagation

Engineering Fracture Mechanics, 2004
Two-dimensional numerical models using the displacement discontinuity method and the PATH algorithm show that shear fractures can propagate in three different patterns, depending on the lateral normal stress (LNS). Under 0 or very small LNS they propagate by open wing cracks, as shown in many previous results.
J.-Cl De Bremaecker, M.C Ferris
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Numerical Modeling of Thermal Conductive Heating in Fractured Bedrock

Groundwater, 2010
Numerical modeling was employed to study the performance of thermal conductive heating (TCH) in fractured shale under a variety of hydrogeological conditions. Model results show that groundwater flow in fractures does not significantly affect the minimum treatment zone temperature, except near the beginning of heating or when groundwater influx is high.
Daniel P, Baston, Ronald W, Falta, Bernard H, Kueper   +2 more
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Numerical Modelling of Fracture Propagation

1983
Why should one study fracture propagation? Is not prediction of fracture initiation the object of fracture mechanics? In his papers on rupture under tensile and compressive loading, Griffith1,2 proposed conditions for fracture initiation which he presumed to be coincident with structural instability. The vast majority of the fracture mechanics research
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