Product Overview:

In this tutorial, we investigate the simulation of an internal explosion using the Smoothed Particle Hydrodynamics (SPH) method in Abaqus. The outer structure is modeled as a three-dimensional solid part, while the explosive (TNT) is also represented as a three-dimensional solid part. The TNT is strategically placed within the outer shell, and during the explosion, it expands and induces damage to the outer structure.

The fracture of ductile metals can occur through two primary mechanisms: ductile fracture, which involves the nucleation, growth, and coalescence of voids, and shear fracture, which is a result of shear band localization. Different criteria for the onset of damage are required for these mechanisms. In this tutorial, we utilize steel material to model the outer part, employing ductile and shear damage criteria as outlined in the Abaqus documentation to predict failure.

For modeling the explosive material, we select the Jones-Wilkins-Lee (JWL) equation of state. The JWL model effectively captures the pressure generated from the chemical energy released during an explosion. This model functions in a programmed burn format, meaning that the initiation of the explosive reaction is not determined solely by shock waves within the material. Instead, the initiation time is calculated using a geometric approach that considers the detonation wave speed and the distance from the detonation points.

Given the nature of this analysis, a dynamic explicit step is appropriate. The general contact capability is utilized to account for all interactions within the contact domain. A fine mesh is essential to achieve accurate results.

Following the simulation, various results, including stress, failure, damage, TNT expansion, and more, can be analyzed.