Product Overview:

This tutorial focuses on modeling an underwater explosion over a reinforced plate. You will learn to:

• Design geometries for the plate and water domain using Abaqus tools.
• Apply the Johnson-Cook material model for the plate while using Acoustic Medium for water.
• Establish dynamic simulation steps to accurately represent wave effects.
• Analyze the results to visualize explosion waves and evaluate displacement metrics.

This guide explores the simulation of shock response in marine sandwich structures subjected to underwater explosion (UNDEX) loads using Abaqus software. With modern advancements in naval warfare and the increasing intensity of weapon strikes, it’s crucial to design naval ship structures that can endure the shock effects from explosive impacts. To enhance the durability of naval ships against air blasts and underwater shock waves, it’s essential to assess the structural damage caused by such explosive forces. When a detonation occurs underwater, the rapid release of energy creates a high-pressure gas that far surpasses hydrostatic levels, generating intense shock waves and gas bubbles. The shorter duration and higher pressure of underwater shock waves, compared to air blasts, make their analysis highly challenging.

In this simulation, the sandwich structure and water are modeled as three-dimensional components.

Steel with elastic-plastic properties and damage mechanics is used for the sandwich structure, while the water is modeled with acoustic properties. The dynamic explicit method is employed for this analysis, and the contact between the structure and water is treated as a perfect interaction. The UNDEX process simulates the explosion scenario, with acoustic coupling applied to the water environment. The quality of the mesh plays a significant role in the simulation outcomes. After the analysis, results such as stress, strain, structural damage, and displacement, as well as pore pressure within the water, can be obtained.