Product Overview:
This tutorial explores simulating an internal explosion within Abaqus using the Smoothed Particle Hydrodynamics (SPH) approach. In this model, the exterior shell is designed as a three-dimensional solid structure, while the explosive component is represented similarly. TNT is positioned inside the shell, and upon detonation, the expanding force of the explosion damages the surrounding outer layer.

When it comes to metal fracture, two primary mechanisms contribute to ductile metal failure: ductile fracture, caused by void nucleation, growth, and merging, and shear fracture, driven by shear band localization. Observations suggest that these mechanisms require unique criteria to identify the onset of damage. In this example, steel serves as the shell material, and both ductile and shear damage models are employed to predict material failure based on Abaqus recommendations. The explosive material is modeled using the JWL (Jones-Wilkins-Lee) equation of state, which defines the pressure from the explosive’s chemical energy release. This model applies a “programmed burn” approach, meaning the explosive’s reaction and initiation are based on detonation wave speed and material distance from detonation points rather than shock responses.

For dynamic analysis, the explicit step in Abaqus is ideal for this type of high-energy simulation. The general contact setting ensures all potential contact interactions are accounted for in the model. A fine mesh is recommended to capture accurate results and detailed damage patterns.

Upon completion, simulation results display stress, damage, material failure, TNT expansion, and more.