An effective FEM-based approach for discrete 3D crack growth

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

A new geometric approach for discrete crack growth modeling is proposed and implemented in a commercial FEM software. The basic idea is to model the crack growth by removing volumes of material as the crack front advances. Thereby, adaptive meshing techniques, found in commercial software, is well-suited for relatively fast and reasonable meshing of the updated geometry. Influence on structural stiffness is negligible, as the amount of removed material is kept insignificant. The approach is automatized in ANSYS APDL and demonstrated by means of energy-based mixed mode stress intensity factors and the crack growth direction criterion by Richard. The applicability of the implemented approach is validated against a previously published experimental result, which tests a mixed mode I + III fatigue loading of a modified CT specimen. The proposed approach may be used as a computational framework for modeling of 2D and 3D crack growth, combined with different crack growth (direction/rate) models.
OriginalsprogEngelsk
Titel28th Nordic Seminar on Computational Mechanics : Proceedings of the NSCM28
RedaktørerArkadi Berezovski, Kert Tamm, Tanel Peets
Antal sider4
Udgivelses stedTallinn
ForlagInstitute of Cybernetics at Tallinn University of Technology
Publikationsdato2015
Sider117-120
ISBN (Trykt)978-9949-430-95-6
ISBN (Elektronisk)978-9949-430-96-3
StatusUdgivet - 2015
BegivenhedThe 28th Nordic Seminar on Computational Mechanics - Tallinn, Estland
Varighed: 22 okt. 201523 okt. 2015
Konferencens nummer: 28

Konference

KonferenceThe 28th Nordic Seminar on Computational Mechanics
Nummer28
LandEstland
ByTallinn
Periode22/10/201523/10/2015

Fingerprint

Crack propagation
Finite element method
Stress intensity factors
Stiffness
Fatigue of materials
Cracks
Geometry

Bibliografisk note

The proceedings cover illustration is reproduced from the extended abstract of Morten Eggert Nielsen from Aalborg University.

Emneord

  • Computational modeling
  • FEM
  • Adaptive remeshing techniques
  • LEFM
  • Fatigue crack growth

Citer dette

Nielsen, M. E., Lambertsen, S. H., Pedersen, E. B., & Damkilde, L. (2015). An effective FEM-based approach for discrete 3D crack growth. I A. Berezovski, K. Tamm, & T. Peets (red.), 28th Nordic Seminar on Computational Mechanics: Proceedings of the NSCM28 (s. 117-120). Tallinn: Institute of Cybernetics at Tallinn University of Technology.
Nielsen, Morten Eggert ; Lambertsen, Søren Heide ; Pedersen, Erik B. ; Damkilde, Lars. / An effective FEM-based approach for discrete 3D crack growth. 28th Nordic Seminar on Computational Mechanics: Proceedings of the NSCM28. red. / Arkadi Berezovski ; Kert Tamm ; Tanel Peets. Tallinn : Institute of Cybernetics at Tallinn University of Technology, 2015. s. 117-120
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title = "An effective FEM-based approach for discrete 3D crack growth",
abstract = "A new geometric approach for discrete crack growth modeling is proposed and implemented in a commercial FEM software. The basic idea is to model the crack growth by removing volumes of material as the crack front advances. Thereby, adaptive meshing techniques, found in commercial software, is well-suited for relatively fast and reasonable meshing of the updated geometry. Influence on structural stiffness is negligible, as the amount of removed material is kept insignificant. The approach is automatized in ANSYS APDL and demonstrated by means of energy-based mixed mode stress intensity factors and the crack growth direction criterion by Richard. The applicability of the implemented approach is validated against a previously published experimental result, which tests a mixed mode I + III fatigue loading of a modified CT specimen. The proposed approach may be used as a computational framework for modeling of 2D and 3D crack growth, combined with different crack growth (direction/rate) models.",
keywords = "Computational modeling, FEM, Adaptive remeshing techniques, LEFM, Fatigue crack growth, Computational modeling, FEM, Adaptive remeshing techniques, LEFM, Fatigue crack growth",
author = "Nielsen, {Morten Eggert} and Lambertsen, {S{\o}ren Heide} and Pedersen, {Erik B.} and Lars Damkilde",
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year = "2015",
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Nielsen, ME, Lambertsen, SH, Pedersen, EB & Damkilde, L 2015, An effective FEM-based approach for discrete 3D crack growth. i A Berezovski, K Tamm & T Peets (red), 28th Nordic Seminar on Computational Mechanics: Proceedings of the NSCM28. Institute of Cybernetics at Tallinn University of Technology, Tallinn, s. 117-120, Tallinn, Estland, 22/10/2015.

An effective FEM-based approach for discrete 3D crack growth. / Nielsen, Morten Eggert; Lambertsen, Søren Heide; Pedersen, Erik B.; Damkilde, Lars.

28th Nordic Seminar on Computational Mechanics: Proceedings of the NSCM28. red. / Arkadi Berezovski; Kert Tamm; Tanel Peets. Tallinn : Institute of Cybernetics at Tallinn University of Technology, 2015. s. 117-120.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - An effective FEM-based approach for discrete 3D crack growth

AU - Nielsen, Morten Eggert

AU - Lambertsen, Søren Heide

AU - Pedersen, Erik B.

AU - Damkilde, Lars

N1 - The proceedings cover illustration is reproduced from the extended abstract of Morten Eggert Nielsen from Aalborg University.

PY - 2015

Y1 - 2015

N2 - A new geometric approach for discrete crack growth modeling is proposed and implemented in a commercial FEM software. The basic idea is to model the crack growth by removing volumes of material as the crack front advances. Thereby, adaptive meshing techniques, found in commercial software, is well-suited for relatively fast and reasonable meshing of the updated geometry. Influence on structural stiffness is negligible, as the amount of removed material is kept insignificant. The approach is automatized in ANSYS APDL and demonstrated by means of energy-based mixed mode stress intensity factors and the crack growth direction criterion by Richard. The applicability of the implemented approach is validated against a previously published experimental result, which tests a mixed mode I + III fatigue loading of a modified CT specimen. The proposed approach may be used as a computational framework for modeling of 2D and 3D crack growth, combined with different crack growth (direction/rate) models.

AB - A new geometric approach for discrete crack growth modeling is proposed and implemented in a commercial FEM software. The basic idea is to model the crack growth by removing volumes of material as the crack front advances. Thereby, adaptive meshing techniques, found in commercial software, is well-suited for relatively fast and reasonable meshing of the updated geometry. Influence on structural stiffness is negligible, as the amount of removed material is kept insignificant. The approach is automatized in ANSYS APDL and demonstrated by means of energy-based mixed mode stress intensity factors and the crack growth direction criterion by Richard. The applicability of the implemented approach is validated against a previously published experimental result, which tests a mixed mode I + III fatigue loading of a modified CT specimen. The proposed approach may be used as a computational framework for modeling of 2D and 3D crack growth, combined with different crack growth (direction/rate) models.

KW - Computational modeling

KW - FEM

KW - Adaptive remeshing techniques

KW - LEFM

KW - Fatigue crack growth

KW - Computational modeling

KW - FEM

KW - Adaptive remeshing techniques

KW - LEFM

KW - Fatigue crack growth

UR - http://www.ioc.ee/nscm28/files/Proceedings_of_NSCM28.pdf

M3 - Article in proceeding

SN - 978-9949-430-95-6

SP - 117

EP - 120

BT - 28th Nordic Seminar on Computational Mechanics

A2 - Berezovski, Arkadi

A2 - Tamm, Kert

A2 - Peets, Tanel

PB - Institute of Cybernetics at Tallinn University of Technology

CY - Tallinn

ER -

Nielsen ME, Lambertsen SH, Pedersen EB, Damkilde L. An effective FEM-based approach for discrete 3D crack growth. I Berezovski A, Tamm K, Peets T, red., 28th Nordic Seminar on Computational Mechanics: Proceedings of the NSCM28. Tallinn: Institute of Cybernetics at Tallinn University of Technology. 2015. s. 117-120