Abstract
This paper investigated the influence of interfacial bonding on the transient response of sandwich plates subject to underwater explosions. It was found that un-bonded sandwich plates receive lower impact energy, and are able to dissipate more energy through plastic deformation of the foam core, than perfectly bonded plates. Consequently, interfacial de-bonding leads to lower net energy transfer from the explosion to the target structure although it also increases the structural deformation due to stiffness reduction. Parametric studies showed that theadvantage(diminishing of net energy transfer) is more significant than thedisadvantage(magnification of the interface deflection). Thus, interfacial de-bonding through active/passive mechanisms may be beneficial for blast-resistant designs.
Highlights
Sandwich plates have been suggested as an effective alternative to monolithic plates to improve the shock resistance of floating marine structures, e.g. ship hulls and decks [1,2]
A schematic drawing of the model configuration is shown in Fig. 1, where an underwater explosion is occurring below an air-backed three-layer sandwich plate with clamped ends
The sandwich plate is composed of two steel face layers and an in-between soft foam core
Summary
Sandwich plates have been suggested as an effective alternative to monolithic plates to improve the shock resistance of floating marine structures, e.g. ship hulls and decks [1,2]. The three-stage model was widely adopted as a framework to model the blast response of sandwich beams It was later extended by [3,7] to consider one-dimensional sandwich structures with varying core strengths. While the three-stage model provides a powerful concept for uniform shocks, the sandwich plate response to underwater explosions (UNDEX) may not be temporally separable due to multi-dimensional fluid-structure interaction effects. The Taylor’s fluid-structure interaction (FSI) effect, the bending/stretching effect, the core compression effect, and the boundary effect were quantitatively and qualitatively evaluated. Among all these effects, the Taylor’s FSI effect is the most significant one. The core compression effect and boundary effect were found to increase the momentum transfer during the later stage of the transient response
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