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

@inproceedings{Defoort:2016,
author = {Defoort, T and Paluszny, A and Zimmerman, RW},
pages = {1265--1271},
title = {Comparison of fracture mechanics and damage mechanics approaches to simulate three-point bending and double-notch shear experiments on rock samples},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - Three-point-bending and double-notch shear experiments are modeled using a continuum damage mechanics approach, and an explicit fracture mechanics approach, for both homogeneous and heterogeneous rocks. The local damage approach uses the Mazars isotropic damage model. In the explicit fracture simulations, fractures are represented as explicit surfaces within a three-dimensional unstructured mesh comprised of isoparametric quadratic tetrahedra and quarter point tetrahedra. Heterogeneities in strength, stiffness and toughness are introduced in a random manner within ±50% of the average values. A characteristic length is used to define the size of element clusters having uniform properties. Both approaches are used to evaluate the influence of material heterogeneity on crack propagation and interaction. Both models reproduce well the experimental results for homogeneous rocks. While in the damage model the mesh is fixed and refined globally, the discrete approach only requires refinement around the fracture tips. In the three-point-bending and double-notch shear simulations, the damage mechanics approach is more realistic in that it leads to rougher crack surfaces. However, the fracture mechanics model predicts lower curvature of the fracture, which better corresponds to experimental observations. Both approaches predict that the presence of heterogeneities seems to diminish fracture interaction.
AU  - Defoort,T
AU  - Paluszny,A
AU  - Zimmerman,RW
EP  - 1271
PY  - 2016///
SP  - 1265
TI  - Comparison of fracture mechanics and damage mechanics approaches to simulate three-point bending and double-notch shear experiments on rock samples
ER  -
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