Sandwich Panels Subjected to Blast Loading

The ANSYS/Autodyn software was employed to investigate the dynamic responses of foam-filled corrugated core sandwich panels under air blast loading. The panels were assembled from metallic face sheets and corrugated webs, and PVC foam inserts with different filling strategies. To calibrate the proposed numerical model, the simulation results were compared with experimental data reported previously. The response of the panels was also compared with that of the empty (unfilled) sandwich panels. Numerical results show that the fluid–structure interaction effect was dominated by front face regardless of the foam fillers. Foam filling would reduce the level of deformation/failure of front face, but did not always decrease the one of back face. It is found that the blast performance in terms of the plastic deflections of the face sheets can be sorted as the following sequence: fully filled hybrid panel, front side filled hybrid panel, back side filled hybrid panel, and the empty sandwich panel. Investigation into energy absorption characteristic revealed that the front face and core web provided the most contribution on total energy absorption. A reverse order of panels was obtained when the maximization of total energy dissipation was used as the criteria of blast performance.

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Linear and non-linear dynamic response of sandwich panels to blast loading

Composites Part B Engineering ◽

10.1016/j.compositesb.2003.07.003 ◽

2004 ◽

Vol 35 (6-8) ◽

pp. 673-683 ◽

Cited By ~ 40

Author(s):

Liviu Librescu ◽

Sang-Yong Oh ◽

Joerg Hohe

Keyword(s):

Dynamic Response ◽

Sandwich Panels ◽

Blast Loading ◽

Linear Dynamic ◽

Non Linear

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Sandwich Panels with Polymeric Foam Cores Exposed to Blast Loading: An Experimental and Numerical Investigation

Applied Sciences ◽

10.3390/app10249061 ◽

2020 ◽

Vol 10 (24) ◽

pp. 9061

Author(s):

Kristoffer Aune Brekken ◽

Aase Reyes ◽

Torodd Berstad ◽

Magnus Langseth ◽

Tore Børvik

Keyword(s):

Shock Tube ◽

Numerical Models ◽

Sandwich Panels ◽

Blast Loading ◽

Experimental Tests ◽

Quantitative Agreement ◽

Low Velocity Impact ◽

Blast Load ◽

Low Velocity ◽

Skin Deformation

Sandwich panels have proven to be excellent energy absorbents. Such panels may be used as a protective structure in, for example, façades subjected to explosions. In this study, the dynamic response of sandwich structures subjected to blast loading has been investigated both experimentally and numerically, utilizing a shock tube facility. Sandwich panels made of aluminium skins and a core of extruded polystyrene (XPS) with different densities were subjected to various blast load intensities. Low-velocity impact tests on XPS samples were also conducted for validation and calibration of a viscoplastic extension of the Deshpande-Fleck crushable foam model. The experimental results revealed a significant increase in blast load mitigation for sandwich panels compared to skins without a foam core, and that the back-skin deformation and the core compression correlated with the foam density. Numerical models of the shock tube tests were created using LS-DYNA, incorporating the new viscoplastic formulation of the foam material. The numerical models were able to capture the trends observed in the experimental tests, and good quantitative agreement between the experimental and predicted responses was in general obtained. One aim of this study is to provide high-precision experimental data, combined with a validated numerical modelling strategy, that can be used in simulation-based optimisation of sandwich panels exposed to blast loading.

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