Imperial College London
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Dr Adriana Paluszny

Faculty of Engineering, Department of Earth Science & Engineering

Reader in Computational Geomechanics
 
 
 
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Contact

 

+44 (0)20 7594 7435apaluszn

 
 
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Location

 

RSM 2.48Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Nejati:2016:10.1016/j.cma.2016.03.028,
author = {Nejati, M and Paluszny, A and Zimmerman, RW},
doi = {10.1016/j.cma.2016.03.028},
journal = {Computer Methods in Applied Mechanics and Engineering},
pages = {123--150},
title = {A finite element framework for modeling internal frictional contact in three-dimensional fractured media using unstructured tetrahedral meshes},
url = {http://dx.doi.org/10.1016/j.cma.2016.03.028},
volume = {306},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper introduces a three-dimensional finite element (FE) formulation to accurately model the linear elastic deformation of fractured media under compressive loading. The presented method applies the classic Augmented Lagrangian(AL)-Uzawa method, to evaluate the growth of multiple interacting and intersecting discrete fractures. The volume and surfaces are discretized by unstructured quadratic triangle-tetrahedral meshes; quarter-point triangles and tetrahedra are placed around fracture tips. Frictional contact between crack faces for high contact precisions is modeled using isoparametric integration point-to-integration point contact discretization, and a gap-based augmentation procedure. Contact forces are updated by interpolating tractions over elements that are adjacent to fracture tips, and have boundaries that are excluded from the contact region. Stress intensity factors are computed numerically using the methods of displacement correlation and disk-shaped domain integral. A novel square-root singular variation of the penalty parameter near the crack front is proposed to accurately model the contact tractions near the crack front. Tractions and compressive stress intensity factors are validated against analytical solutions. Numerical examples of cubes containing one, two, twenty four and seventy interacting and intersecting fractures are presented.
AU  - Nejati,M
AU  - Paluszny,A
AU  - Zimmerman,RW
DO  - 10.1016/j.cma.2016.03.028
EP  - 150
PY  - 2016///
SN  - 0045-7825
SP  - 123
TI  - A finite element framework for modeling internal frictional contact in three-dimensional fractured media using unstructured tetrahedral meshes
T2  - Computer Methods in Applied Mechanics and Engineering
UR  - http://dx.doi.org/10.1016/j.cma.2016.03.028
UR  - http://hdl.handle.net/10044/1/32511
VL  - 306
ER  -
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