Coupled Fluid–Structure Interaction based Numerical Investigation on the Large Deformation Behavior of Thin Plates Subjected to under Water Explosion

Coupled fluid structure interaction based numerical investigation on rectangular mild steel plates subjected to underwater explosion is tested using Explosion Bulge Testing (EBT) is presented in this paper. The test plate along with the EBT box model fixture immersed in water domain subjected to small explosive charges of PEK I at a standoff distance of 0.15 m from centre of the plate is considered for the analysis using LSDYNA code. For the analysis, explosive charge is modelled using high explosive burn with JWL equation of state. The fluid is using null material model with Gruinesian equation of state, the EBT setup is using Lagrangian solid element with rigid material model and the test plate is modelled using Belytschko-Tsay shell element with piece-wise linear plasticity material model. The numerical analysis aims to predict the permanent deformation of the plate under various shock loading conditions. The results are then compared with experimental results available in the literature and numerical results based on Taylor’s plate theory. Parametric investigations on the large deformation behaviour of different plate thickness of various shock loading conditions are presented.