The adhesive layer plays an important role on the stress and deformation transfer between composite patch and parent plate in a repaired structure. In this paper, based on the nonlinear material properties and continuum damage mechanics, the three-dimensional progressive damage model of the repaired specimen has been built to investigate the effect of initial adhesive disbonding on the ultimate strength and the damage state. The results indicate that the initial adhesive disbonding does not change the final failure mode, but results in the decrease of the final failure load. The decreasing amount of final failure load for the repaired specimen with four-layer patch is larger than that for the repaired specimen with two-layer patch.
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The authors appreciate their supports from China Postdoctoral Science Foundation Funded Project (2016M602256), Henan Province Science and Technology Key Project (172102210001) and the Opening Project of Dike safety and Disease Prevention Engineering Technology Research Center of Ministry of Water Resources (Grant no. 201607).
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