Numerical Investigation of Circular Plates Deformation under Air Blast Wave

In the current research the maximum deflection of circular plates made of the AA5010 and AA1100 alloys under blast load was investigated. Shock waves were produced by exploding a spherical charge in different distances from the center of plates. The ABAQUS software uses the conwep equation for the blast loading analysis. It was found that the results of these simulations have about 30% to 40% inaccuracy in comparison with experimental results. To improve the accuracy of simulations, the Friedlander equation was used that considers the positive phase of blast wave as exponential and the negative phase as bi-linear function. To this goal, the VDLOAD subroutine was developed. Results were shown the difference between the experimental and simulation data was decreased to 8%. Moreover, the effect of uniform and non-uniform shock waves on deformation of structure and various failures were investigated. It was observed that uniform shock waves can be attained when the minimum distance of exploding charge and plate is about 3 times of the radius of plate.

کلیدواژه ها:

Blast loading ، Friedlander equation ، Circular plate ، Failure ، Explosive forming