Journal: Engineering Fracture Mechanics

Abbreviation

Eng. fract. mech.

Publisher

Elsevier

Journal Volumes

ISSN

0013-7944
1873-7315

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Publications1 - 10 of 40
  • Phase-field approach for precise fracture tracking in anisotropic rocks: Integrating orthotropy-based energy decomposition and two-fold symmetric fracture toughness
    Item type: Journal Article
    Sakha, Mahsa; Nagaraja, Sindhu; Driesner, Thomas (2024)
    Engineering Fracture Mechanics
    Rock formations are known to exhibit material anisotropy, both in terms of elastic and fracture properties. This means that the fracture path in such formations is not a priori known but rather a complex unknown that requires robust numerical techniques to predict accurately. In this context, the phase-field model is considered particularly effective, provided that certain physical considerations are carefully adjusted to align with the physics of the problem. While addressing elastic anisotropy is well-established, the tension–compression asymmetry necessary to inhibit crack interpenetration in phase-field fracture models needs to account for the specific material anisotropy. Additionally, to accurately capture crack propagation, it is critical to simultaneously account for orientation-dependent fracture toughness in such materials. To address this, the present study employs an anisotropic phase-field model that integrates the generalized spectral decomposition proposed in the literature for orthotropic materials with a two-fold symmetric fracture toughness, to predict the fracture trajectories in rock-type samples under fixed mixed-mode loading ratios. While each of the two aspects has primarily been applied to model orthotropic plates under simple tensile and shearing loading conditions in the literature, here we study their applicability in complex loading scenarios. To this end, the experimental data from notched semi-circular specimens of Grimsel Granite undergoing complex mixed-mode loading obtained in our previous work is considered. We focus on two given mode-mixity ratios and perform numerical studies. Our results emphasize the importance of considering this generalized decomposition for phase-field modeling of fracturing in rock-type materials, particularly under loading conditions where the crack might otherwise be unrealistically driven into the compressive region. Although certain features are well captured by considering anisotropy in elasticity alone, our findings demonstrate that incorporating a two-fold symmetric fracture toughness proves to be advantageous for more precise tracking of the fracture path.
  • On the relative use of micro-mechanical lattice analysis of 3-phase particle composites
    Item type: Journal Article
    Lilliu, G.; Mier, J. G.M. van (2007)
    Engineering Fracture Mechanics
  • Temporal and spatial development of drying shrinkage cracking in cement-based materials
    Item type: Journal Article
    Shiotani, T.; Bisschop, J.; Van Mier, J.G.M. (2003)
    Engineering Fracture Mechanics
  • A comparative study of mode I delamination behavior of unidirectional glass fiber-reinforced polymers with epoxy and polyurethane matrices using two methods
    Item type: Journal Article
    Montenegro, Davi M.; Pappas, Georgios A.; Botsis, John; et al. (2019)
    Engineering Fracture Mechanics
  • Phase-field simulation of interactive mixed-mode fracture tests on cement mortar with full-field displacement boundary conditions
    Item type: Journal Article
    Wu, Tao; Carpiuc-Prisacari, A.; Poncelet, Martin; et al. (2017)
    Engineering Fracture Mechanics
  • Finite element simulations of hydraulic fracturing: A comparison of algorithms for extracting the propagation velocity of the fracture
    Item type: Journal Article
    Pezzulli, Edoardo; Nejati, Morteza; Salimzadeh, Saeed; et al. (2022)
    Engineering Fracture Mechanics
    The finite element method is a powerful and general numerical method used to simulate subsurface processes. In this paper, we take recent hydraulic fracturing propagation algorithms and assess their performance when used within the finite element framework. In particular, we evaluate aperture and energy-based methodologies that are capable of extracting the propagation velocity of a hydraulic fracture propagating throughout the toughness and viscous regime. Such algorithms have the benefit of a quicker convergence on the fracture front. The aperture-based methodology consists of the multi-scale aperture asymptote that is yet to be applied with finite elements. On the other-hand, the energy-based methodology consists of a recently developed procedure for predicting the propagation velocity from the energy release rate, which is calculated using a J-integral devised for hydraulic fracturing. A comparison of the accuracy and the number of iterations required to converge on the fracture length is undertaken, and found to produce similar results for both methods. Consequently, we conclude that the higher accuracy of energy-based methods in extracting stress intensity factors does not immediately translate to a higher accuracy in extracting propagation velocities, most notably in the toughness-dominated propagation regime. Given the similar performance of the methods, and the simplicity of the aperture-based approach, we then extend the evaluation of the multi-scale aperture asymptote to the case of buoyancy-driven propagation. As a result, the aperture asymptote is shown to be a simple and efficient method for the simulation of subsurface processes using a finite element framework.
  • Lattice modelling of size effect in concrete strength by Ince R, Arslan A, Karihaloo BL
    Item type: Journal Article
    Mier, J. G. M. van (2004)
    Engineering Fracture Mechanics
  • The finite element over-deterministic method to calculate the coefficients of crack tip asymptotic fields in anisotropic planes
    Item type: Journal Article
    Ayatollahi, Majid R.; Nejati, Morteza; Ghouli, Saeid (2020)
    Engineering Fracture Mechanics
  • Debonding analysis of thin plates from curved substrates
    Item type: Journal Article
    De Lorenzis, Laura; Zavarise, Giorgio (2010)
    Engineering Fracture Mechanics
  • Coupled cohesive zone models for mixed-mode fracture: A comparative study
    Item type: Journal Article
    Dimitri, Rossana; Trullo, M.; De Lorenzis, Laura; et al. (2015)
    Engineering Fracture Mechanics
Publications1 - 10 of 40