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Shock and Vibration
Volume 7, Issue 6, Pages 333-341
http://dx.doi.org/10.1155/2000/984015

Structural Response of Submerged Air-Backed Plates by Experimental and Numerical Analyses

Lloyd Hammond1 and Raphael Grzebieta2

1Aeronautical and Maritime Research Laboratory, Defence Science and Technology Organisation, Melbourne Victoria, 3001, Australia
2Department of Civil Engineering, Monash University, Clayton, Victoria, Australia

Received 9 December 1998; Revised 17 October 1999

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents the results of a series of small-scale underwater shock experiments that measured the structural responses of submerged, fully clamped, air-backed, steel plates to a range of high explosive charge sizes. The experimental results were subsequently used to validate a series of simulations using the coupled LS-DYNA/USA finite element/boundary element codes. The modelling exercise was complicated by a significant amount of local cavitation occurring in the fluid adjacent to the plate and difficulties in modelling the boundary conditions of the test plates. The finite element model results satisfactorily predicted the displacement-time history of the plate over a range of shock loadings although a less satisfactory correlation was achieved for the peak velocities. It is expected that the predictive capability of the finite element model will be significantly improved once hydrostatic initialisation can be fully utilised with the LS-DYNA/USA software.