Two-dimensional fatigue crack growth analysis using extended finite element method (xfem)
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Date
2018-05
Authors
Muhammad Shafeeq Abdul Hannan
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Abstract
This thesis proposes the ability an improved FEM technique known as extended
finite element method (XFEM) to analyse fatigue crack growth under constant
amplitude loading. This thesis compares numerically modelled crack propagation in a
bending steel specimen with experimentally conducted and simulated previously using
traditional FEM technique. The aim of the study was to perform numerical analysis of
crack propagation in order to determine the shape of the crack extension. Model of the
test specimen was prepared based on geometric parametres and cyclic load condition.
The numerical analysis was performed using Abaqus 6.12-2. Crack propagation was
simulated by using the numerical extended finite element method (XFEM) under low cycle fatigue criterion using direct cyclic approach. This thesis, verifies the validity of
this numerical method for crack propagation. The numerical results of the direction of
the crack propagation were compared with the experimental findings in a real specimen
and previously simulated using adapative technique method in the literature [1]. The
outcome of the proposed method is not as what was expected due to the crack
propagation was not like illustrated in the literature. It is shown that the computed crack
path does not justify the previous findings.