Prediction of Damage Effect of Close-Range Underwater Blast Shock Wave on Titanium Alloy Ring-Ribbed Cylindrical Shells Based on CEL Methodology

The shock wave load generated by the close-range explosion of a deep-water bomb can cause a threat or even a destructive blow to the pressure-resistant shell of large underwater systems. High-strength titanium alloys attract attention increasingly in the application of underwater structures, but there has been little research on the blast resistance of titanium alloy shells. In this paper, based on the damage criterion with the rule of a “0–1” probability distribution function, the coupled Euler–Lagrange (CEL) method is verified by comparing the simulation results with the destructive mode of the existing damaged shell and used to predict the damage of TNT underwater blast loads on a rib-stiffened cylindrical titanium alloy shell. Results show that the adopted damage criterion could be applied to simulate the damage modes of the pressure-resistant shell well. A study on size effects illustrates that the results of the scaled model could be extended to an enlarged structure, which will provide a reference for efficient experimental studies of titanium alloy shells.