The overlapping method is commonly used in fiber-reinforced plastic (FRP) bulkhead-hull bonding. This study replaced the traditional overlap approach in using FRP components for bonding with the use of structural adhesives in the bulkhead-hull joint. A numerical simulation was conducted to investigate the structural response of the FRP-based bulkhead joint to underwater explosion shocks and examine the bonding differences between the application of structural adhesives and the traditional overlap approach. For precise estimation and shortening the numerical calculation process, solid elements were used to construct a local model using ABAQUS/Acoustic to simulate the effects of underwater explosions. In addition, two sizes of structural adhesive joint were considered for comparison with overlapping joints. The simulation results revealed that the application of structural adhesives provided an effective buffer between the hull and bulkhead by dissipating the stress from underwater explosions, reducing the maximum stress response by 67%. Moreover, although the amount of structural adhesive exhibited negligible effects on impact loading, overapplication may conversely lead to structural hardening.

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