Abstract
Three-dimensional fully coupled simulation is conducted to analyze the dynamic response of sandwich panels comprising equal thicknesses face sheets sandwiching a corrugated core when subjected to localized impulse created by the detonation of cylindrical explosive. A large number of computational cases have been calculated to comprehensively investigate the performance of sandwich panels under near-field air blast loading. Results show that the deformation/failure modes of panels depend strongly on stand-off distance. The beneficial FSI effect can be enhanced by decreasing the thickness of front face sheet. The core configuration has a negligible influence on the peak reflected pressure, but it has an effect on the deflection of a panel. It is found that the benefits of a sandwich panel over an equivalent weight solid plate to withstand near-field air blast loading are more evident at lower stand-off distance.
Highlights
Sandwich panels constructed from light face sheets and relatively low density cores are famous for the powerful ability to support bending load and to save structural weight
A classic solution has been built by Taylor [4] to analyze the interaction between acoustic blast wave and free-standing plate, whereas the shock waves are characterized with high intensity and spatially localization in the case of near-field blast
Recent experimental results have revealed that the square honeycomb and pyramidal lattice core sandwich panels suffer significantly smaller back face deflections than solid plates with identical mass when subjected to high intensity air blast loading
Summary
Sandwich panels constructed from light face sheets and relatively low density cores are famous for the powerful ability to support bending load and to save structural weight. Recent experimental results have revealed that the square honeycomb and pyramidal lattice core sandwich panels suffer significantly smaller back face deflections than solid plates with identical mass when subjected to high intensity air blast loading. It is found that the benefits of square honeycomb core [9] and pyramidal lattice core [13] sandwich panels over monolithic plates diminish when the impulse intensity of shock wave is extremely high This is due to the complete crush of core webs at the center of panel and the dynamic fracture of front faces (as a result of the high strength of inertially stabilized trusses). The aim of present study is to investigate the dynamic behavior of corrugated core sandwich panels subjected to highly intense near-field air blast loading and reveal the relationship between the structural performance metrics and geometry parameters by conducting numerical simulations
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