Numerical model validation of a floating charge explosion (Floatex) close to a ship panel
conference paper
Experiments and numerical simulations of ship stiffened panels subjected to nearby Floatex (Floating charge explosion) scenarios are presented. Three cases are considered with different charge sizes and stand-off distances between the charge and the panel resulting in large deflection of the panel, reaching rupture in one of the three cases. In the simulation approach used the loading (water, air and detonation products) is simulated by the Apollo Blastsimulator software and the panel response is simulated by LS-DYNA. Direct coupling is enabled between the two software during the simulation, thus accounting for the fluid-structure interaction. Key phenomena are identified in the analysis of the loading such as the air blast, the water shock, cavitation (closure) in front of the panel and expansion of the water crater. All these aspects play a role in the panel response resulting in large deformation without failure for two shots and with failure for one shot. For two shots, an excellent agreement with the experiments is reached in terms of maximum panel deflection and the rupture pattern (for the case with rupture). In the third shot, the maximum panel deflection (without rupture) was over-predicted. Nevertheless, this study shows the importance to adequately model all aspects arising in Floatex events in combination with an appropriate material model for the structural target.
TNO Identifier
991996
Publisher
TNO
Source title
26th International Symposium on Military Aspects of Blast and Shock MABS, Wollongong, Australia, 3-8 December 2023
Collation
15 p.
Place of publication
Delft
Pages
Paper 51
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