Drop Weight Impact Properties of Double Layer Honeycomb Core Sandwich Panels

(Investigation of Mechanical Model until Crack Initiation in Top Plate)

Abstract

Honeycomb core sandwich panel (hereafter, HSP for brevity) are superior in impact absorption under whole surface compression. However, impact properties of HSP under local compression such as drop weight impact are affected by mechanical properties of the plate as the face sheet in addition to the core layer. In this study, a simple mechanical model of the double layer HSP subjected to the drop weight impact was proposed based on the experimental results. The numerical analysis by the proposed mechanical model was conducted. From test results, when the strength of the core was high, the load-displacement curve and the deflection curve of the double layer HSP were successfully reproduced. On the other hand, when the strength of the core was weak, some of calculated deflection curves disagreed with the measured deflection curves. It showed the range of the application of the proposed mechanical model.