Coupled FEM-BEM Crack Growth Analysis
Author(s)
L. Zhang & R. A. Adey
Abstract
The increasing interest in large structure fracture analysis has heightened the
need for efficient numerical computational tools suitable to predict crack
propagation. While a sub modelling approach can be used in some cases it does
not take into account the redistribution of the loads in the structure thus requiring
a large part of the structure to be included in the crack growth model.
Generally large structures are modelled with finite element methods (FEM)
because of the many varied types of structural element. Modelling crack growth
with FEM results in a particularly complex remeshing process as the crack
propagates. Hence, self-adaptive remeshing is one of the major features that must
be incorporated in the construction of a computational tool to properly perform
crack propagation analysis with the FE method.
The boundary element method (BEM) has attracted lots of attention in the
field of fracture mechanics as it simplifies the meshing process and has the
ability to accurately represent the singular stress fields near the crack front. One
challenge is how the two methods can work together efficiently for a large
structure. A new FEM-BEM method is therefore proposed to perform such crack
growth analyses.
This paper describes the methodology of a coupled FEM-BEM crack growth
analysis for a large scale structure. Both finite element software ABAQUS and
boundary element software BEASY were used in the analysis. Several examples
are presented at the end of the paper including crack growth in a gear tooth and
in a stiffened panel respectively.
Keywords: finite element, boundary element, coupling method, fracture
mechanics, crack growth, stress intensity factor.
Keywords
finite element, boundary element, coupling method, fracture
mechanics, crack growth, stress intensity factor.
Related Book
Other papers in this volume
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