Volume 6, Issue 3 (September 2008)
IJCE 2008, 6(3): 198-207 |
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Ebrahimi S, Mohammadi S, Asadpoure A. An Extended Finite Element (XFEM) Approach for Crack Analysis in Composite Media. IJCE 2008; 6 (3) :198-207
URL: http://ijce.iust.ac.ir/article-1-179-en.html
URL: http://ijce.iust.ac.ir/article-1-179-en.html
Abstract: (12226 Views)
A new approach is proposed to model a crack in orthotropic composite media using the extended
finite element method (XFEM). The XFEM uses the concept of partition of unity in addition to meshless basic
idea of approximating a field variable by its values at a set of surrounding nodes. As a result, higher order
approximations can be designed with the same total number of degrees of freedom. In this procedure, by using
meshless based ideas, elements containing a crack are not required to conform to crack edges. Therefore mesh
generating is performed without any consideration of crack conformations for elements and the method has
the ability of extending the crack without any remeshing. Furthermore, the type of elements around the cracktip
is the same as other parts of the finite element model and the number of nodes and consequently degrees
of freedom are reduced considerably in comparison to the classical finite element method. Developed
orthotropic enrichment functions are further modified to enable modeling isotropic problems.
Type of Study: Research Paper |
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