In the first section of this work, a suitable data reduction scheme is developed to measure the adhesive joints strain energy release\r\nrate under pure mode-I loading, and in the second section, three types of adhesive hybrid lap-joints, that is, Aluminum-GFRP\r\n(Glass Fiber Reinforced Plastic), GFRP-GFRP, and Steel-GFRP were employed in the determination of adhesive hybrid joints\r\nstrengths and failures that occur at these assemblies under tension loading. To achieve the aims, Double Cantilever Beam (DCB)\r\nwas used to evaluate the fracture state under the mode-I loading (opening mode) and also hybrid lap-joint was employed to\r\ninvestigate the failure load and strength of bonded joints. The finite-element study was carried out to understand the stress intensity\r\nfactors in DCB test to account fracture toughness using J-integral method as a useful tool for predicting crack failures. In the\r\ncase of hybrid lap-joint tests, a numerical modeling was also performed to determine the adhesive stress distribution and stress\r\nconcentrations in the side of lap-joint. Results are discussed in terms of their relationship with adhesively bonded joints and thus\r\ncan be used to develop appropriate approaches aimed at using adhesive bonding and extending the lives of adhesively bonded\r\nrepairs for aerospace structures.
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