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The computation of the strain energy release rate and the stress intensity factor in a fracture mechanics problem is of great importance since they categorise and characterize the crack growth. The work presented in this thesis concentrates on the calculation of the strain energy release rate and the stress intensity factor by the finite element method for general power type singularity problems. Based on the Irwin's crack closure integral method, strain energy release rate formulae for 3D finite elements are derived. Applications to embedded elliptical and semielliptical surface crack are also presented. A family of 2D finite elements which have the capability of modelling general power type singularity problems is developed. Those elements are useful in modelling cracks perpendicular to a bimaterial interface and kinked cracks where the stress singularity has a value different from 0.5. The concept of the 2D element has been extended to develop a 3D 6noded element containing a singularity ?, which can be used to model a corner singularity at the crack front free surface intersection and cracks in composite materials.
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