Dynamic Behavior of Submerged Cylindrical Shells Under Combined Underwater Explosion, Bubble Pulsation, and...

Area of Science:

• Naval Architecture and Marine Engineering
• Structural Mechanics
• Fluid Dynamics

Background:

• Underwater vehicles require robust cylindrical shells to withstand extreme deep-water conditions.
• Hydrostatic pressure and underwater explosions create synergistic damaging effects on these structures.
• Understanding dynamic responses is critical for preventing catastrophic failures.

Purpose of the Study:

• To investigate the dynamic responses and buckling failure mechanisms of deep-water cylindrical shells under underwater explosion.
• To develop and validate a numerical model incorporating hydrostatic pressure effects.
• To analyze the influence of explosion depth and distance on shell failure modes.

Main Methods:

• Finite element method (FEM) was employed for numerical simulations.
• A Coupled Eulerian-Lagrangian (CEL) model was developed to simulate hydrostatic pressure.
• Three-dimensional models of spherical charges and cylindrical shell targets were established.

Main Results:

• The numerical models accurately simulated the combined effects of hydrostatic pressure, shock waves, and bubble pulsation.
• Key factors like explosion depth and distance significantly influenced shell failure modes.
• Complex synergic damage mechanisms were identified in deeply immersed shells.

Conclusions:

• The validated numerical approach provides a reliable tool for analyzing deep-water shell responses to explosions.
• Findings offer valuable insights for designing safer and more resilient deep-water marine structures.
• This research contributes to mitigating risks associated with underwater vehicle operations.