Discrete Element Approach for the Wellbore Instability of Laminated and Fissured Rocks

2002 ◽  
Author(s):  
K. Yamamoto ◽  
Y. Shioya ◽  
N. Uryu
Keyword(s):  
Discrete Element ◽  
Wellbore Instability ◽  
Element Approach

Relating 4D seismics to reservoir geomechanical changes using a discrete element approach

2010 ◽  
Vol 58 (4) ◽  
pp. 657-668 ◽  
Author(s):  
Haitham Alassi ◽  
Rune Holt ◽  
Martin Landrø
Keyword(s):  
Discrete Element ◽  
Element Approach

scholarly journals Transition zone in Bearing Capacity Problem from Plasticity Method, Discrete Element Method and Laboratory tests

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Yungming Cheng
Keyword(s):  
Discrete Element Method ◽  
Bearing Capacity ◽  
Transition Zone ◽  
Laboratory Tests ◽  
Friction Angle ◽  
Discrete Element ◽  
Element Approach ◽  
Plastic Stage ◽  
Elastic Stage ◽  
The Continuum

<p>In this paper, the classical bearing capacity problem and the logspiral transition zone are re-considered from a continuum plasticity approach as well as discrete element approach. In the discrete element approach, the bearing capacity problem is considered from the elastic stage, plastic stage to the final rupture stage. It is found that there are noticeable differences in the failure mechanism between the continuum and discontinuum analyses, and the well-known logspiral transition zone is also not apparent in both the discrete element approach, plasticity approach as well as the laboratory tests. With the increase in the friction angle of soil, the transition zone is becoming more like a wedge zone than a logspiral zone as found from the present study. </p>

scholarly journals Numerical modeling of residual stresses during vibratory peening of a 3-stage Blisk – a multi-scale discrete element and finite element approach

2022 ◽  
Vol 299 ◽  
pp. 117383
Author(s):  
Joselito Yam Alcaraz ◽  
Jing Zhang ◽  
Arun Prasanth Nagalingam ◽  
Sharan Kumar Gopasetty ◽  
Boon Loong Toh ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
Residual Stresses ◽  
Discrete Element ◽  
Finite Element Approach ◽  
Multi Scale ◽  
Element Approach

scholarly journals Microstructure-based modeling of snow mechanics: a discrete element approach

2015 ◽  
Vol 9 (2) ◽  
pp. 1425-1460 ◽  
Author(s):  
P. Hagenmuller ◽  
G. Chambon ◽  
M. Naaim
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Discrete Element ◽  
Compression Tests ◽  
Confined Compression ◽  
Compression Behavior ◽  
Bonding System ◽  
Element Approach ◽  
Snow Mechanics ◽  
Snow Samples

Abstract. Rapid and large deformations of snow are mainly controlled by grain rearrangements, which occur through the failure of cohesive bonds and the creation of new contacts. We exploit a granular description of snow to develop a discrete element model based on the full three-dimensional microstructure captured by microtomography. The model assumes that snow is composed of rigid grains interacting through localized contacts accounting for cohesion and friction. The geometry of the grains and of the intergranular bonding system are explicitly defined from microtomographic data using geometrical criteria based on curvature and contiguity. Single grains are represented as rigid clumps of spheres. The model is applied to different snow samples subjected to confined compression tests. A detailed sensitivity analysis shows that artifacts introduced by the modeling approach and the influence of numerical parameters are limited compared to variations due to the geometry of the microstructure. The model shows that the compression behavior of snow is mainly controlled by the density of the samples, but that deviations from a pure density parameterization are not insignificant during the first phase of deformation. In particular, the model correctly predicts that, for a given density, faceted crystals are less resistant to compression than rounded grains or decomposed snow. For larger compression strains, no clear differences between snow types are observed.

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