An eXtended Finite Element Method implementation in COMSOL Multiphysics: Solid Mechanics

This paper presents the implementation of the eXtended Finite Element Method (XFEM) in the general-purpose commercial software COMSOL Multiphysics for the first time. An enrichment strategy is proposed, consistent with the structure of the software. To this end, for each set of enrichment functions,...

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Published in:Finite elements in analysis and design Vol. 202; p. 103707
Main Authors: Jafari, Ahmad, Broumand, Pooyan, Vahab, Mohammad, Khalili, Nasser
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 01.05.2022
Elsevier BV
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ISSN:0168-874X, 1872-6925
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Abstract This paper presents the implementation of the eXtended Finite Element Method (XFEM) in the general-purpose commercial software COMSOL Multiphysics for the first time. An enrichment strategy is proposed, consistent with the structure of the software. To this end, for each set of enrichment functions, an additional Solid Mechanics module is incorporated into the numerical framework, coupled with compatible modifications to the internal variables. The Linear Elastic Fracture Mechanics (LEFM) is exclusively adopted for the crack analysis. The model pre-processing, level set update, stress intensity factor calculation and crack propagation analysis are conducted by employing COMSOL’s built-in features in conjunction with external MATLAB functions through COMSOL LiveLink. All implementational aspects and suggested remedies for the treatment of enriched elements, framework setup, evaluation of stress intensity factors, and numerical integration are described in detail. The accuracy and robustness of the proposed method are examined by several numerical examples, including mixed-mode crack propagation in 2D domains as well as stationary planar fractures in 3D settings. The results represent excellent agreement with available analytical, numerical and experimental observations in the literature. •XFEM implementation in COMSOL Multiphysics is proposed for the first time.•The proposed XFEM enrichment procedure is straight-forward and simple to follow.•The developed model is explored and validated versus a range of benchmark problems.
AbstractList This paper presents the implementation of the eXtended Finite Element Method (XFEM) in the general-purpose commercial software COMSOL Multiphysics for the first time. An enrichment strategy is proposed, consistent with the structure of the software. To this end, for each set of enrichment functions, an additional Solid Mechanics module is incorporated into the numerical framework, coupled with compatible modifications to the internal variables. The Linear Elastic Fracture Mechanics (LEFM) is exclusively adopted for the crack analysis. The model pre-processing, level set update, stress intensity factor calculation and crack propagation analysis are conducted by employing COMSOL’s built-in features in conjunction with external MATLAB functions through COMSOL LiveLink. All implementational aspects and suggested remedies for the treatment of enriched elements, framework setup, evaluation of stress intensity factors, and numerical integration are described in detail. The accuracy and robustness of the proposed method are examined by several numerical examples, including mixed-mode crack propagation in 2D domains as well as stationary planar fractures in 3D settings. The results represent excellent agreement with available analytical, numerical and experimental observations in the literature. •XFEM implementation in COMSOL Multiphysics is proposed for the first time.•The proposed XFEM enrichment procedure is straight-forward and simple to follow.•The developed model is explored and validated versus a range of benchmark problems.
This paper presents the implementation of the eXtended Finite Element Method (XFEM) in the general-purpose commercial software COMSOL Multiphysics for the first time. An enrichment strategy is proposed, consistent with the structure of the software. To this end, for each set of enrichment functions, an additional Solid Mechanics module is incorporated into the numerical framework, coupled with compatible modifications to the internal variables. The Linear Elastic Fracture Mechanics (LEFM) is exclusively adopted for the crack analysis. The model pre-processing, level set update, stress intensity factor calculation and crack propagation analysis are conducted by employing COMSOL's built-in features in conjunction with external MATLAB functions through COMSOL LiveLink. All implementational aspects and suggested remedies for the treatment of enriched elements, framework setup, evaluation of stress intensity factors, and numerical integration are described in detail. The accuracy and robustness of the proposed method are examined by several numerical examples, including mixed-mode crack propagation in 2D domains as well as stationary planar fractures in 3D settings. The results represent excellent agreement with available analytical, numerical and experimental observations in the literature.
ArticleNumber 103707
Author Vahab, Mohammad
Broumand, Pooyan
Jafari, Ahmad
Khalili, Nasser
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  givenname: Ahmad
  surname: Jafari
  fullname: Jafari, Ahmad
  organization: School of Civil and Environmental Engineering, The University of New South Wales, Sydney 2052, Australia
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  givenname: Pooyan
  orcidid: 0000-0001-8769-4962
  surname: Broumand
  fullname: Broumand, Pooyan
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  givenname: Mohammad
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  surname: Vahab
  fullname: Vahab, Mohammad
  email: m.vahab@unsw.edu.au
  organization: School of Civil and Environmental Engineering, The University of New South Wales, Sydney 2052, Australia
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  givenname: Nasser
  surname: Khalili
  fullname: Khalili, Nasser
  organization: School of Civil and Environmental Engineering, The University of New South Wales, Sydney 2052, Australia
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Fracture propagation
Crack analysis
XFEM
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Snippet This paper presents the implementation of the eXtended Finite Element Method (XFEM) in the general-purpose commercial software COMSOL Multiphysics for the...
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SubjectTerms COMSOL Multiphysics
Crack analysis
Crack propagation
Enrichment
Finite element analysis
Finite element method
Fracture mechanics
Fracture propagation
Linear elastic fracture mechanics
Mechanics
Numerical integration
Propagation modes
Robustness (mathematics)
Software
Solid mechanics
Stress intensity factors
Stress propagation
XFEM
Title An eXtended Finite Element Method implementation in COMSOL Multiphysics: Solid Mechanics
URI https://dx.doi.org/10.1016/j.finel.2021.103707
https://www.proquest.com/docview/2638291375
Volume 202
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