3D Fatigue Crack Propagation for VAST


  1. Jiang, L.
  2. Wallace, J.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
A state-of-the-art literature review of the extended finite element method (XFEM) has been conducted. This method permits cracks to be located arbitrarily inside an element, such that crack propagation can be modeled without re-meshing. A procedure for implementing the XFEM into existing general-purpose finite element programs has been suggested. A comparison of the XFEM and the enriched fracture element formulation currently implemented in VAST is also provided. Based on this literature review, the XFEM is highly recommended for implementation in VAST. A review of state-of-the-art third party crack propagation software was also conducted. This included ZENCRACK, AFGROW and NASGRO. The status of the deterministic, solid modelling capability in LIFE3D was also reviewed. While the original version of LIFE3D was designed to model crack propagation in three dimensional finite element models of surface cracks, the current version of Trident FEA (in which LIFE3D has been incorporated) includes no facility for generating the required 3D crack front meshes required by the deterministic, solid mesh modelling version of LIFE3D. Similarly, the automated re-meshing algorithm is also missing from the current version of Trident FEA. There still exist versions of LIFE3D that perform the fatigue calculations for 3D cracks but for deterministic loads only.

Il y a un résumé en français ici.

Report Number
DRDC-ATLANTIC-CR-2009-098 — Contractor Report
Date of publication
01 Nov 2009
Number of Pages
Electronic Document(PDF)

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