Abstract: Surface core debonding is a common damage type of composite sandwich structures. Considering the coupling effects of surface core interface damage evolution, layered buckling and layered extension, a method for predicting the ultimate bearing capacity of composite cylindrical shells under deep water static load was established. Based on the nonlinear ultimate load calculation method, the buckling characteristics of composite cylindrical shells with surface core disbonding defects were analyzed by prefabrication of initial defects, and the influence mechanism of typical surface core disbonding defects on the failure mode and bearing characteristics of composite cylindrical shells was revealed. The influence laws of different surface core disbonding types, disbonding sizes and disbonding positions were obtained. It is found that the failure mode of the structure evolves from global buckling to mixed buckling to local buckling with the increase of core disbonding length. The outer skin/core layer core stripping is more sensitive to the ultimate load bearing of the cylindrical shell with the core stripping of the annular through surface, and the inner skin/core layer interface stripping is more sensitive to the ultimate load bearing of the cylindrical shell with the core stripping of the longitudinal through surface. For multiple local circular core desticking, the more concentrated the longitudinal distribution and the more discrete the circumfe-rential distribution, the higher the structural ultimate load loss rate. The research results have a good guiding significance for the optimal design and reliability evaluation of cylindrical shells with surface core disbonding defects.
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2024, Vol. 38 
