Product Overview:
This tutorial delves into the sequential simulation of air blast explosions on a concrete slab reinforced with a CFRP sheet, utilizing Abaqus for analysis. In this setup, the concrete slab is modeled as a three-dimensional solid component, while the CFRP sheet is represented as a three-dimensional shell part.

To analyze the behavior of the concrete slab under intense blast loading, the Concrete Damaged Plasticity material model is implemented. This model effectively captures both tensile and compressive damage responses during detonation. For the CFRP, lamina elasticity and Hashin’s damage criterion with damage evolution are utilized. The sequential analysis comprises three distinct dynamic explicit procedures. The initial simulation employs a dynamic explicit step, where ideal contact is established between the slab and the CFRP sheet. The CONWEP air blast procedure is applied to model the effects of the blast wave on the reinforced slab, with fixed boundary conditions set along the slab’s edges. A fine mesh is crucial for obtaining accurate results.

Following the first simulation, a comprehensive set of results—including stress, strain, and both tensile and compressive damage—can be analyzed. These outcomes are then imported into a new simulation to establish the initial conditions. This means that the slab and CFRP begin with pre-existing residual stresses and damage prior to the application of a second detonation. After this second simulation, results are again collected for assessment. Lastly, in the third simulation, the findings from the second round are treated as the new initial conditions.