Abstract
A critical review of analytical studies reported in the literature to characterise the stress distribution in the near-tip region of interfacial cracks in bonded dissimilar materials was undertaken to identify potential fracture criteria applicable to aluminium-epoxy bonds that possess crack like defects. The results of the literature review clearly imply that a meaningful fracture criterion for such composite syteems must consist of a mixed mode parameter including both mode I (opening mode) and mode II (in-plane shear) type external loading. A fracture criterion based on a critical ‘effective’ stress intensity parameter given by (K I 2 + K II 2) 1 2 is proposed. Preliminary experimental results involving both compliance measurements and fracture toughness testing demonstrate that the proposed fracture criteria can be used to predict accurately the critical combination of applied stress and defect size (porosity, lack of bond or cracks) required to cause failure of aluminium-epoxy adhesive bonds.
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