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

Morten Eggert Nielsen, Søren Heide Lambertsen, Erik B. Pedersen, Lars Damkilde

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

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.
Original languageEnglish
Title of host publication28th Nordic Seminar on Computational Mechanics : Proceedings of the NSCM28
EditorsArkadi Berezovski, Kert Tamm, Tanel Peets
Number of pages4
Place of PublicationTallinn
PublisherInstitute of Cybernetics at Tallinn University of Technology
Publication date2015
Pages117-120
ISBN (Print)978-9949-430-95-6
ISBN (Electronic)978-9949-430-96-3
Publication statusPublished - 2015
EventThe 28th Nordic Seminar on Computational Mechanics - Tallinn, Estonia
Duration: 22 Oct 201523 Oct 2015
Conference number: 28

Conference

ConferenceThe 28th Nordic Seminar on Computational Mechanics
Number28
Country/TerritoryEstonia
CityTallinn
Period22/10/201523/10/2015

Bibliographical note

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

Keywords

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

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