Abstract
A study was conducted to investigate the stress ratio effect on cyclic debond growth behavior in adhesively bonded composite joints. The system studied consisted of graphite/epoxy adherends bonded with a toughened epoxy adhesive. Two specimen types were tested: (1) a double cantilever beam specimen for mode I loading and (2) a cracked lap shear specimen for mixed mode I–II loading. This study showed that strain energy release rate range, ΔG = G max - G min , was the driving factor for cyclic debonding of the tested bonded system when subjected to cyclic loads with different stress ratios for both mode I and mixed mode I–II loadings.
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