Product Overview:
This tutorial explores the simulation of damage to a reinforced concrete slab subjected to an underwater explosion, employing the CEL method in Abaqus. In this model, the Eulerian domain is composed of TNT, air, and water, each represented in a three-dimensional Eulerian part. Meanwhile, the concrete slab is created as a solid, three-dimensional part, and the steel reinforcement is modeled using a three-dimensional wire configuration.

Accurately predicting the damage and potential failure of structures exposed to underwater explosions (UNDEX) is essential for marine engineering applications. The dynamic response of structures near an underwater explosion is highly complex, involving factors such as explosive detonations, shock wave propagation, gas bubble pulsations, fluid-structure interactions, and nonlinear structural vibrations. Explosives in this simulation are modeled using the Jones-Wilkins-Lee equation of state, which translates the explosion’s chemical energy into mechanical pressure. Water properties are represented using the Us-Up equation of state, while air is defined as an ideal gas through its specific equation of state. For steel reinforcement under intense shock loads, an elastic-plastic model with ductile damage criteria is applied. Abaqus offers various material models to simulate concrete behavior under blast loading. To accurately represent the extensive damage expected on slab surfaces, it’s necessary to select an appropriate material model, which can be defined in the code by modifying the input file. A dynamic explicit step and a general contact algorithm are utilized, both fitting well for this type of analysis. The embedded constraint feature is used to integrate the reinforcement as an embedded region within the concrete matrix. Fixed boundary conditions are assigned to the slab’s bottom and side surfaces, while Eulerian materials are handled using the volume fraction method with uniform material settings applied in this example. A refined mesh is necessary for accurate results.

Upon completing the simulation, results such as stress distributions, damage regions, failure points, blast wave propagation, and TNT expansion are available for review.