Dynamic Response of a Stiffened Cylindrical Shell with a Variable Cross Section Subjected to Shock Wave and Bubble Load

Considering the typical tail of a scaled unmanned undersea vehicle, namely a stiffened cylindrical shell with a variable cross-section, as a research object, its dynamic responses to underwater explosion shock wave and bubble load are simulated using the ALE algorithm in LS-DYNA. The dynamic response of a stiffened cylindrical shell subjected to underwater explosion loads is analyzed and the effects of the impulse factor and explosion orientation on structural damage characteristics are discussed. The results indicate that the damage of shock wave to a stiffened cylindrical shell with a variable cross-section gradually increases with an increase in the impulve factor and that the bubble load further increases the concave deformation and plastic region of the shell. The jet load increases initially and then decreases with an increase in the impulse factor, meaning the jet load is maximized at a specific impulse factor. Explosion orientation has little effect on the damage of shock wave to a stiffened cylindrical shell with a variable cross-section. When the charge is directly above the stiffened cylindrical shell, the jet load is the greatest, resulting in the maximum final damage and deformation of the structure.