Implementation of 3D XFEM in VAST

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Authors
  1. Yuen, B.
Corporate Authors
Defence Research and Development Canada, Atlantic Research Centre, Halifax NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
The modeling of fracture and material damage has been a problem of significant interest in solid mechanics for a long time. This is because crack initiation and propagation are important factors that need to be considered in the design and maintenance of practical engineering systems. One example is the accurate prediction of fatigue crack propagation in ship structures subjected to spectral loading conditions. Many finite element formulations have been proposed for fracture mechanics analyses over the years. However, all the classical finite element approaches have a common disadvantage. They require the crack be explicitly modeled in the finite element mesh, which can cause significant difficulties in finite element mesh generation. In addition, to simulate crack propagation, continuous remeshing has to be performed. In order to minimize the requirement of remeshing during crack propagation analysis, a new finite element formulation, named the extended finite element method (XFEM) has been developed. Compared with earlier numerical methods for fracture mechanics, XFEM has a number of advantages, including (a) it does not require the cracks be explicitly modeled along element boundaries, so no or minimal remeshing is needed for crack propagation; (b) it is a finite element method, so it can be implemented in existing general-purpose finite element programs such as VAST; (c) in contrast to boundary elements, it is readily applicable to nonlinear problems; (d) in contrast to f
Keywords
XFEM;fracture;crack growth
Report Number
DRDC-RDDC-2015-C257 — Contract Report
Date of publication
01 Nov 2015
Number of Pages
39
DSTKIM No
CA043120
CANDIS No
804407
Format(s):
Electronic Document(PDF)

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