Abstract
Experimental and numerical investigations on cylindrical shell panels subjected to underwater explosion loading are presented. Experiments were conducted on panels of size 0.8 × 0.6 × 0.00314 m and shell rise-to-span ratiosh/l= 0.0, 0.05, 0.1 , using a box model set-up under air backed conditions in a shock tank. Small charges of PEK I explosive were employed. The plastic deformation of the panels was measured for three loading conditions. Finite element analysis was carried out using the CSA/GENSA [DYNA3D] software to predict the plastic deformation for various loading conditions. The analysis included material and geometric non-linearities, with strain rate effects incorporated based on the Cowper-Symonds relation. The numerical results for plastic deformation are compared with those from experiments.
Highlights
Non-contact underwater explosions are widely used to cause damage to ship structures as a part of naval warfare strategy
Ramajeyathilagam et al [19] have established the first two failure modes for rectangular plates under air backed condition subjected to underwater explosion on the basis of shock tank tests and numerical analysis
In the present paper an experimental investigation on the large deformation of cylindrical shell panels subjected to underwater explosion is presented followed by numerical modelling
Summary
Non-contact underwater explosions are widely used to cause damage to ship structures as a part of naval warfare strategy. The response of structures subjected to the resultant shock loading is quite complex involving fluid – structure interaction, high strain rates, material and geometric non-linearities, large deformation, tensile tearing and rupture. Ramajeyathilagam et al [19] have established the first two failure modes for rectangular plates under air backed condition subjected to underwater explosion on the basis of shock tank tests and numerical analysis. Cylindrical shell panels find wide use in ship and offshore structures and there is a need to understand their behavior under shock loading. In the present paper an experimental investigation on the large deformation of cylindrical shell panels subjected to underwater explosion is presented followed by numerical modelling. The experiments were carried out on airbacked cylindrical shell panels with rise-to-span ratio h/l = (0.0, 0.05, 0.1), to study the curvature effects on the shock response. Numerical analysis has been carried out using the CSA/GENSA [DYNA3D] [20] non-linear finite element code and the results compared with experimental data
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