Vol. 6, No. 1-4, 2011

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ISSN: 1559-3959
Accurate simulation of mixed-mode cohesive crack propagation in quasi-brittle structures using exact asymptotic fields in XFEM: an overview

Bhushan Lal Karihaloo and Qi-Zhi Xiao

Vol. 6 (2011), No. 1-4, 267–276
Abstract

The extended finite element (XFEM) enriches the standard local FE approximations with known information about the problem, with the use of the partition of unity. This allows the use of meshes that do not conform to a discontinuity and avoids adaptive re-meshing as the discontinuity grows as required with the conventional FEM. When the crack tip asymptotic field is available and used as the enrichment function, XFEM is more accurate than FEM allowing the use of a much coarser mesh around the crack tip. Such asymptotic fields have been known for a long time for traction-free cracks (the Williams expansions) but have only recently been derived for cohesive cracks (Karihaloo–Xiao expansions). In this paper an overview of latter expansions is given for a range of cohesive laws and their usefulness in the simulation of cohesive crack propagation is demonstrated on two examples of concrete and fibre-reinforced concrete flexural members.

Keywords
Asymptotic displacement field, asymptotic stress field, cohesive crack, extended finite element (XFEM)
Milestones
Received: 28 May 2010
Revised: 27 August 2010
Accepted: 8 September 2010
Published: 28 June 2011
Authors
Bhushan Lal Karihaloo
School of Engineering
Cardiff University
Cardiff
CF24 3AA
United Kingdom
Qi-Zhi Xiao
LUSAS FEA Ltd
Forge House
66 High Street
Kingston-upon-Thames
KT1 1HN
United Kingdom