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An hp-adaptive discontinuous Galerkin method for phase field fracture

Bird, Robert E.; Augarde, Charles E.; Coombs, William M.; Duddu, Ravindra; Giani, Stefano; Huynh, Phuc T.; Sims, Bradley

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Authors

Dr Robert Bird robert.e.bird@durham.ac.uk
PDRA in Computational Solid Mechanics

Ravindra Duddu

Phuc T. Huynh

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Bradley Sims bradley.sims@durham.ac.uk
PGR Student Doctor of Philosophy



Abstract

The phase field method is becoming the de facto choice for the numerical analysis of complex problems that involve multiple initiating, propagating, interacting, branching and merging fractures. However, within the context of finite element modelling, the method requires a fine mesh in regions where fractures will propagate, in order to capture sharp variations in the phase field representing the fractured/damaged regions. This means that the method can become computationally expensive when the fracture propagation paths are not known a priori. This paper presents a 2D -adaptive discontinuous Galerkin finite element method for phase field fracture that includes a posteriori error estimators for both the elasticity and phase field equations, which drive mesh adaptivity for static and propagating fractures. This combination means that it is possible to be reliably and efficiently solve phase field fracture problems with arbitrary initial meshes, irrespective of the initial geometry or loading conditions. This ability is demonstrated on several example problems, which are solved using a light-BFGS (Broyden–Fletcher–Goldfarb–Shanno) quasi-Newton algorithm. The examples highlight the importance of driving mesh adaptivity using both the elasticity and phase field errors for physically meaningful, yet computationally tractable, results. They also reveal the importance of including -refinement, which is typically not included in existing phase field literature. The above features provide a powerful and general tool for modelling fracture propagation with controlled errors and degree-of-freedom optimised meshes.

Citation

Bird, R. E., Augarde, C. E., Coombs, W. M., Duddu, R., Giani, S., Huynh, P. T., & Sims, B. (2023). An hp-adaptive discontinuous Galerkin method for phase field fracture. Computer Methods in Applied Mechanics and Engineering, 416, Article 116336. https://doi.org/10.1016/j.cma.2023.116336

Journal Article Type Article
Acceptance Date Jul 31, 2023
Online Publication Date Aug 28, 2023
Publication Date 2023-11
Deposit Date Aug 4, 2023
Publicly Available Date Aug 29, 2024
Journal Computer Methods in Applied Mechanics and Engineering
Print ISSN 0045-7825
Electronic ISSN 1879-2138
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 416
Article Number 116336
DOI https://doi.org/10.1016/j.cma.2023.116336
Public URL https://durham-repository.worktribe.com/output/1712051
Publisher URL https://www.sciencedirect.com/journal/computer-methods-in-applied-mechanics-and-engineering

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