Steiner-point free edge cutting of tetrahedral meshes with applications in fracture

Realistic 3D finite strain analysis and crack propagation with tetrahedral meshes require mesh refinement/division. In this work, we use edges to drive the division process. Mesh refinement and mesh cutting are edge-based. This approach circumvents the variable mapping procedure adopted with classic...

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Bibliographic Details
Published in:Finite elements in analysis and design Vol. 132; pp. 27 - 41
Main Authors: Areias, P., Rabczuk, T.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15.09.2017
Elsevier BV
Subjects:
3D edge-based division
3D fracture
Algorithms
Crack propagation
Cracks
Cutting
Cutting parameters
Deformation
FORTRAN
Knee
Local mesh refinement
Prisms
Strain
Strain analysis
Tetrahedral cutting
3D edge-based division
Local mesh refinement
3D fracture
Tetrahedral cutting
ISSN:0168-874X, 1872-6925
Online Access:Get full text
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Summary:Realistic 3D finite strain analysis and crack propagation with tetrahedral meshes require mesh refinement/division. In this work, we use edges to drive the division process. Mesh refinement and mesh cutting are edge-based. This approach circumvents the variable mapping procedure adopted with classical mesh adaptation algorithms. The present algorithm makes use of specific problem data (either level sets, damage variables or edge deformation) to perform the division. It is shown that global node numbers can be used to avoid the Schönhardt prisms. We therefore introduce a nodal numbering that maximizes the trapezoid quality created by each mid-edge node. As a by-product, the requirement of determination of the crack path using a crack path criterion is not required. To assess the robustness and accuracy of this algorithm, we propose 4 benchmarks. In the knee-lever example, crack slanting occurs as part of the solution. The corresponding Fortran 2003 source code is provided. •Unique tetrahedral partition by edges without Steiner points.•Node pre-ordering to optimize mesh quality.•Screened-Poisson equation to regularize the constitutive problem.•3D fracture without explicit crack path criterion.•Prediction of slanting in plane stress.
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ISSN:0168-874X
1872-6925
DOI:10.1016/j.finel.2017.05.001