Abstract
In this paper, adhesive-bonded joints are analysed using the finite element method by computing the strain energy release rate for debonding. Paired nodes are generated on the interfaces and released one after another in a proper sequence, modelling gradual crack growth. Strain energy release rates in modes I and II are evaluated. The method is validated for a sample cracked lap shear (CLS) specimen. Bonded joints are studied for various ratios of elastic moduli, thicknesses of adherend and adhesive, and total length to overlap length, for eight different crack growth locations along the interfaces. Theoretical failure loads are predicted in terms of a critical strain energy release, and material properties and geometries are suggested that may result in extending the load-carrying capacity of these joints.
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