Fluid–structure-interaction for a steel plate subjected to non-contact explosion

The objective of this study is to simulate behaviour of a steel plate subjected to non-contact explosion by using LS-DYNA software. Arbitrary-Lagrangian–Eulerian (ALE) algorithm for fluid–structure-interaction model of the LS-DYNA software was adopted. Results of the fluid–structure-interaction model using the ALE algorithm were compared with the results of the Lagrangian model and experimental results of Boyd (2000) [1]. The efficiency and accuracy of fluid–structure-interaction and Lagrangian models were studied. The results indicated that pressure and impulse values of shock wave were mainly affected by initial internal energy of air. If the model of air have initial internal energy with a temperature of 3000 K and maintain pressure of standard atmosphere, both the pressure and impulse values of shock waves were close to the US Army Technical Manual TM5-1300 data, with a maximum relative difference of 10% for a scaled distance between 0.3 and 1.6 m/kg1/3. The results of a fluid–structure-interaction model with initial internal energy of 3000 K of air showed that the relative difference in the maximum midpoint displacement of a steel plate with Pentolite explosive at a distance of 50 and 25 cm were 15.3% and 0.5%, respectively.