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Numerische Simulation der Druckstoßwirkung zentrischer und exzentrischer Nahbereichsexplosionen auf eingespannte quadratische und rechteckige Stahlplatten
: Fraunhofer-Institut für Kurzzeitdynamik, Ernst-Mach-Institut, Abteilung für Ballistik -EMI-AFB-, Weil/Rhein
The effect of blast of explosions close to clamped steel plates on their dynamic-plastic behaviour is investigated. For quadratic plates of 1 m 2 and 2 mm thickness the permanent deformations induced by a central 1 kg detonation at various height of bursts are determined by computation and compared with experiments. During the numerical simulation the spatial and temporal pressure distribution is taken into account by 20 different blast curves given by analytical expressions in the literature. By a very refined discretisation of structure and loading the time history of the average pressure and impulse acting on the plate can be determined. By proper scaling the results may be extrapolated to larger plates and charges. The influence of excentricity of detonation is investigated for quadratic steel plates as well as for rectangular plates with dimensions 1 m asterisk 0.5 m and 2 mm thickness. Ground zero is located at 1/4 of the axis of symmetry or the diagonals.